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SSC Stenographer 2026 12 September 2026 Shift 2 GK Questions – with answers & solutions

All 44 GK / GS questions asked in SSC Stenographer 2026 on 12 September 2026 Shift 2, with correct answers and short solutions, subject-wise: Static GK, Physics, Biology, Chemistry, Economics, Geography.

📚 44 questions🗓️ 12 September 2026⏰ Shift 2
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Subjects: Static GK (18) · Physics (2) · Biology (2) · Chemistry (2) · Economics (9) · Geography (7) · Ancient History (3) · Medieval History (1)

Static GK (18)

Books and Authors · Modern Indian books and authors

Q1. How does Vikram Seth's A Suitable Boy combine traditional Indian narrative structures with Western literary form?

  1. (a) Through a focus on religious scriptures
  2. (b) By using the picaresque form set in mythological India
  3. (c) Through a family saga model inspired by 19th-century realist novels
  4. (d) By using poetry throughout the novel
Answer & solution

Answer: (c) Through a family saga model inspired by 19th-century realist novels

Answer: Option 3 — Through a family saga model inspired by 19th-century realist novels
A Suitable Boy (1993) follows four families through post-Independence north India in the manner of Tolstoy and George Eliot — a broad, realistic family saga.
The Indian material is the arranged-marriage search of Lata Mehra; the form is the 19th-century realist novel.
Revision note — Vikram Seth and A Suitable Boy
• Published in 1993; at about 1,349 pages it is one of the longest single-volume novels in English.
• Set in 1950–52 in the fictional town of Brahmpur, against the backdrop of India's first general election and land reform.
• Four families — the Mehras, Kapoors, Khans and Chatterjis; the heroine Lata Mehra must choose among three suitors.
• Won the Commonwealth Writers' Prize (1994) and the WH Smith Literary Award; it was adapted as a BBC series (2020) directed by Mira Nair.
• Seth's other works: The Golden Gate (1986) — a novel written entirely in sonnets (Sahitya Akademi Award 1988); An Equal Music (1999), set in the world of Western classical music.
• Two Lives (2005) is his memoir of his great-uncle Shanti and aunt Henny; From Heaven Lake (1983) is a travel book that won the Thomas Cook Travel Book Award.
• Seth received the Padma Shri in 2007.
Do not mix these up
• A Suitable Boy vs The Golden Gate — the saga is in prose; it is The Golden Gate that is written in verse.
• A Suitable Boy vs Train to Pakistan — the Partition novel is by Khushwant Singh; SSC often lists the two together as a distractor pair.
Also asked from this topic: the author of A Suitable Boy, published in 1993 (Vikram Seth); the author of An Equal Music (Vikram Seth); the book NOT written by Khushwant Singh (A Suitable Boy).
Books and Authors · Modern Indian books and authors

Q2. In what way does Salman Rushdie's Midnight's Children redefine post-colonial Indian literature?

  1. (a) It adheres strictly to Western realist tradition.
  2. (b) It uses magical realism to represent political and historical events.
  3. (c) It avoids historical references to maintain neutrality.
  4. (d) It criticizes British literature exclusively.
Answer & solution

Answer: (b) It uses magical realism to represent political and historical events.

Answer: Option 2 — It uses magical realism to represent political and historical events.
Midnight's Children (1981) tells India's history from 1947 onwards through Saleem Sinai, born at the stroke of midnight on 15 August 1947, whose telepathic powers bind him to the nation's fate.
This blend of fantasy with real events — Partition, the wars, the Emergency — is magical realism, and it set the template for later Indian English fiction.
Revision note — Salman Rushdie and Midnight's Children
• Published 1981; won the Booker Prize 1981, then the Booker of Bookers (1993) and the Best of the Booker (2008).
• The 1,001 children born in the first hour of Independence each carry a special gift; Saleem's rival is Shiva.
• Filmed by Deepa Mehta in 2012.
• Rushdie was born in Bombay in 1947; his other novels include Shame (1983), The Satanic Verses (1988) and Haroun and the Sea of Stories (1990).
• Later works: The Moor's Last Sigh (1995), The Ground Beneath Her Feet (1999), Shalimar the Clown (2005), set in Kashmir, and Victory City (2023).
• Joseph Anton (2012) is his memoir of the years in hiding after the 1989 fatwa over The Satanic Verses; Knife (2024) recounts the 2022 attack on him.
Do not mix these up
• Midnight's Children vs The Moor's Last Sigh — both use magical realism, but only Midnight's Children won the Booker.
• Rushdie vs Amitav Ghosh — The Ground Beneath Her Feet is Rushdie's; The Glass Palace and The Hungry Tide are Ghosh's.
Also asked from this topic: the author of Midnight's Children (Salman Rushdie); the Rushdie book that won the 1981 Booker Prize (Midnight's Children); the author of Shalimar the Clown (Salman Rushdie).
Books and Authors · Modern Indian books and authors

Q3. Why is Qurratulain Hyder's Aag Ka Darya (River of Fire) considered a landmark in Indian literature?

  1. (a) For its depiction of the Mughal Empire through magical realism
  2. (b) For spanning over two millennia of Indian history to explore continuity and change
  3. (c) For being the first feminist novel in Urdu
  4. (d) For its translation into Sanskrit
Answer & solution

Answer: (b) For spanning over two millennia of Indian history to explore continuity and change

Answer: Option 2 — For spanning over two millennia of Indian history to explore continuity and change
Aag Ka Darya (1959) moves from the 4th century BC of Chandragupta Maurya to the years just after Partition, with the same names — Gautam, Champa, Kamal — reborn in each age.
That sweep of about 2,500 years in one novel, and its argument that India's composite culture outlasts every political break, is what makes it a landmark.
Revision note — Qurratulain Hyder
• Urdu novelist, 1927–2007, born in Aligarh; affectionately called Ainee Apa.
• Aag Ka Darya was published in 1959; she herself transcreated it into English as River of Fire (1998).
• The novel runs through four eras — ancient India, the late Sultanate and Mughal age, the East India Company period, and the 20th century up to Partition.
• She migrated to Pakistan after Partition but returned to India in 1961.
• Awards: Sahitya Akademi Award (1967) for Patjhar ki Awaz; Jnanpith Award (1989) for Aakhir-e-Shab ke Humsafar; Padma Shri (1984) and Padma Bhushan (2005).
• She was the fourth woman to win the Jnanpith, after Ashapoorna Devi (1976), Amrita Pritam (1981) and Mahadevi Varma (1982), and before Mahasweta Devi (1996).
Also asked from this topic: the 1959 novel by Qurratulain Hyder known for its insights on Partition (Aag Ka Darya); the first woman to win the Jnanpith Award (Ashapoorna Devi, 1976).
Tribes, Languages and Religions · Religions and religious texts

Q4. During which festival is the recitation of the "Akhand Path" (continuous reading of the Guru Granth Sahib) most prominently observed?

  1. (a) Baisakhi
  2. (b) Gurpurab
  3. (c) Hola Mohalla
  4. (d) Diwali (Sikh tradition)
Answer & solution

Answer: (b) Gurpurab

Answer: Option 2 — Gurpurab
The Akhand Path is an unbroken reading of all 1,430 angs of the Guru Granth Sahib, finished in about 48 hours by relays of readers.
It is begun two days before a Gurpurab so that its Bhog (conclusion) falls on the festival morning.
Gurpurabs are the birth or martyrdom anniversaries of the Sikh Gurus, and the Akhand Path is their central observance.
Revision note — Gurpurab and the Guru Granth Sahib
• The chief Gurpurab is Guru Nanak Jayanti on Kartik Purnima (October–November).
• It is marked by Prabhat Pheris, the Akhand Path, a Nagar Kirtan led by the Panj Pyare, and langar.
• Guru Gobind Singh Jayanti falls in December–January; Shahidi Divas of Guru Arjan Dev (martyred 1606) is observed in June.
• The Adi Granth was compiled by the fifth Guru, Guru Arjan Dev, in 1604, scribed by Bhai Gurdas, and installed in the Harmandir Sahib.
• Guru Gobind Singh added the hymns of Guru Tegh Bahadur and in 1708 at Nanded declared the Granth the eternal Guru.
• It is written in Gurmukhi and contains hymns of Bhakti and Sufi saints too — Kabir, Namdev, Ravidas, Sheikh Farid.
• Sikh festivals in the year: Gurpurabs, Baisakhi (13–14 April), Hola Mohalla (day after Holi), Bandi Chhor Divas (Diwali).
Do not mix these up
• Gurpurab vs Baisakhi — Baisakhi marks the founding of the Khalsa by Guru Gobind Singh in 1699 and the spring harvest; Gurpurab marks a Guru's anniversary.
• Hola Mohalla vs Bandi Chhor Divas — Hola Mohalla (Anandpur Sahib, 1701) is the martial festival of mock battles; Bandi Chhor Divas, on Diwali, recalls Guru Hargobind's release from Gwalior Fort, 1619.
Also asked from this topic: whom Gurpurab honours (the Sikh Gurus); the scripture recited at Hola Mohalla (Guru Granth Sahib); what Bandi Chhor Divas marks (Guru Hargobind's release with 52 kings).
Music and Musical Instruments · Folk music and songs by state

Q5. Which of the following aspects best distinguishes the Birha folk music tradition of Uttar Pradesh from other regional folk styles like Kajri and Chaiti?

  1. (a) Its exclusive association with monsoon rituals and feminine voice traditions in the Bhojpuri belt
  2. (b) Its thematic focus on divine love stories, especially those of Radha and Krishna
  3. (c) Its role as a narrative expression of separation, struggle, and migration, especially among male laborers
  4. (d) Its primary function in temple rituals and Sufi devotional gatherings, accompanied by harmonium and tabla
Answer & solution

Answer: (c) Its role as a narrative expression of separation, struggle, and migration, especially among male laborers

Answer: Option 3 — Its role as a narrative expression of separation, struggle, and migration, especially among male laborers
Birha takes its name from viraha — separation.
It grew among the Ahir (Yadav) cowherds of the Bhojpuri belt as the song of men who left home for the mills and cities, and of the families they left behind.
Kajri and Chaiti are seasonal songs; Birha is a narrative ballad of hardship and migration, sung mainly by men.
Revision note — Folk songs of Uttar Pradesh
• Birha — eastern UP (Varanasi, Azamgarh, Jaunpur, Ballia, Ghazipur) and western Bihar.
• It began as short khari birha couplets and grew into long narrative birha sung with dholak, harmonium and kartal.
• Kajri — sung by women in the monsoon month of Sawan, centred on Mirzapur and Varanasi; often an all-night group song-and-dance.
• Chaiti — sung in the month of Chaitra (March–April); a semi-classical form whose lines often end with the refrain "ho Rama".
• Sohar — sung at the birth of a child in UP and Bihar; Alha — the heroic ballad of Alha and Udal from Bundelkhand.
• Hori and Phag — Holi songs of Braj; Rasiya — love songs of Braj; Nautanki — the folk theatre of UP.
• The Purvanchal singer Sharda Sinha (Padma Vibhushan 2025) made Bhojpuri and Maithili folk songs nationally known.
Do not mix these up
• Birha vs Kajri — Birha is the men's song of separation and migration; Kajri is the women's song of the rains.
• Chaiti vs Kajri — both are semi-classical seasonal songs, but Chaiti belongs to spring (Chaitra) and Kajri to the monsoon (Sawan).
Also asked from this topic: the state famous for the Kajri folk form (Uttar Pradesh); the UP folk song sung by women in the monsoon (Kajri); the folk song sung at birth celebrations in Bihar and UP (Sohar).
Dances · Folk dances by state

Q6. In the traditional performance of Karagattam, how do the lyrics of the accompanying songs contribute to the ritualistic and performative depth of the dance?

  1. (a) By focusing solely on romantic ballads detached from the religious context
  2. (b) By incorporating devotional themes praising rain deities like Mariamman, reinforcing the dance's role in agrarian fertility rituals
  3. (c) By following strict Carnatic compositional structures with minimal lyrical variation
  4. (d) By emphasizing abstract philosophical concepts unrelated to everyday village life
Answer & solution

Answer: (b) By incorporating devotional themes praising rain deities like Mariamman, reinforcing the dance's role in agrarian fertility rituals

Answer: Option 2 — By incorporating devotional themes praising rain deities like Mariamman, reinforcing the dance's role in agrarian fertility rituals
Karagattam is danced in Tamil Nadu with a decorated pot (karagam) balanced on the head as an offering to Mariamman, the village goddess of rain and health.
The songs praise the goddess and ask for rain and a good harvest, which is why the dance belongs to temple festivals and the farming calendar.
Revision note — Karagattam and the folk dances of Tamil Nadu
• The pot is filled with water or raw rice and topped with flowers and a paper parrot; dancers balance it while bending, spinning and even climbing.
• Two forms: Sakthi Karagam, danced in temples as a ritual for the goddess, and Aatta Karagam, the entertainment version at village fairs.
• Accompaniment: nadaswaram, thavil, urumi and pambai; the tradition is linked to the Thanjavur region.
• Mayilattam — the peacock dance in peacock-feather costume performed in temples of Lord Murugan.
• Kavadi Attam — devotees carry a decorated arch (kavadi) for Murugan; Poikkal Kudirai Attam — the dummy-horse dance; Puliyattam — the tiger dance.
• Bommalattam — Tamil puppetry; Therukoothu — Tamil street theatre; Oyilattam — men's dance with coloured kerchiefs; Kolattam — stick dance.
Do not mix these up
• Karagattam vs Kavadi Attam — both are offerings carried on the body, but the pot honours Mariamman and the kavadi honours Murugan.
• Mariamman vs Meenakshi — Mariamman is the village goddess of rain and disease; Meenakshi is the presiding deity of the Madurai temple.
Also asked from this topic: the deity to whom Karagattam is dedicated (Goddess Mariamman); the state of the Karakattam pot dance (Tamil Nadu); the peacock-feather dance of Murugan temples (Mayilattam).
Music and Musical Instruments · Devotional and semi-classical song forms

Q7. How does Maand music of Rajasthan serve as a cultural bridge between folk traditions and classical Indian music, and what features distinguish it from purely folk or classical forms?

  1. (a) By strictly following the rules of Hindustani classical music with no folk influences
  2. (b) By incorporating folk narratives and emotions into structured melodic frameworks that borrow elements of classical ragas, thus blending spontaneity with discipline
  3. (c) By focusing only on fast-paced dance tunes with minimal lyrical depth
  4. (d) By using only percussion instruments and avoiding melodic instruments
Answer & solution

Answer: (b) By incorporating folk narratives and emotions into structured melodic frameworks that borrow elements of classical ragas, thus blending spontaneity with discipline

Answer: Option 2 — By incorporating folk narratives and emotions into structured melodic frameworks that borrow elements of classical ragas, thus blending spontaneity with discipline
Maand is the semi-classical singing style of Rajasthan: its words are folk — love, longing, praise of the land — but its melody is disciplined by the Hindustani raga also called Maand.
That is why it sits between the village song and the concert stage.
Revision note — Maand and the music of Rajasthan
• Maand grew in the royal courts of Jaisalmer, Jodhpur, Bikaner and Udaipur; the best-known song is "Kesariya Balam, aavo ni padharo mhare des".
• Great exponents: Allah Jilai Bai of Bikaner (Padma Shri 1982), Gavri Devi of Jodhpur and Mangi Bai of Udaipur.
• The Manganiyar and Langa communities of Jaisalmer and Barmer are hereditary musicians; the Manganiyars play the bowed kamaicha, the Langas the sarangi and algoza.
• Other Rajasthani forms: Panihari (women's songs at the well), Pabuji ki Phad (a scroll ballad sung with the ravanhattha) and the Kalbelia songs of the snake-charmer community.
• Folk instruments: kamaicha, ravanhattha, algoza, morchang, khartal, sarangi.
• The Rajasthan International Folk Festival (RIFF) at Mehrangarh Fort, Jodhpur is recognised by UNESCO and stages Manganiyar and Langa artists.
Do not mix these up
• Maand (Rajasthan) vs Mando (Goa) — Maand is a semi-classical Rajasthani song; Mando is a slow Goan song-and-dance form in Konkani.
• Langa vs Manganiyar — both are Muslim musician communities of western Rajasthan; the Langas play the sarangi and the Manganiyars the kamaicha.
Also asked from this topic: what best describes traditional Rajasthani music such as Maand (tied to nature, life and stories); the string instrument central to the Manganiyar tradition (kamaicha).
Space, Defence and Technology · Launch vehicles and satellites

Q8. Which of the following best characterizes the strategic advantages and technical challenges of space-based surveillance systems, particularly in the context of national security?

  1. (a) They provide persistent global coverage and real-time tactical data without the need for ground-based infrastructure, but are limited by high latency and atmospheric attenuation
  2. (b) They offer wide-area, day-night, and all-weather monitoring capabilities, but face limitations in coverage due to Earth's curvature and terrain masking.
  3. (c) They enable high-resolution imagery, early warning, and missile tracking, but are vulnerable to anti-satellite (ASAT) weapons and require complex orbital coordination.
  4. (d) They primarily rely on passive sonar and radio triangulation methods to detect ground targets, which reduces their utility in desert and mountainous environments.
Answer & solution

Answer: (c) They enable high-resolution imagery, early warning, and missile tracking, but are vulnerable to anti-satellite (ASAT) weapons and require complex orbital coordination.

Answer: Option 3 — They enable high-resolution imagery, early warning, and missile tracking, but are vulnerable to anti-satellite (ASAT) weapons and require complex orbital coordination.
Surveillance satellites give high-resolution optical and radar imagery, infrared early warning of missile launches and tracking of missiles in flight.
Their weak points are exactly what the option names: they can be destroyed or jammed by anti-satellite weapons,
and a useful constellation needs many satellites in carefully planned orbits so that a target is revisited often enough.
Earth's curvature and terrain masking limit ground radars, not satellites; sonar works under water; and every satellite still needs ground stations to downlink its data.
Revision note — Space-based surveillance and India
• Cartosat satellites give high-resolution optical images (Cartosat-3, 2019, about 25 cm resolution); RISAT satellites carry synthetic aperture radar for day-night, all-weather imaging.
• EMISAT (April 2019), built with DRDO, is India's electronic-intelligence satellite; GSAT-7 (Rukmini) serves the Navy and GSAT-7A the Air Force.
• Mission Shakti, 27 March 2019 — India's first ASAT test, in which a DRDO interceptor destroyed Microsat-R in low Earth orbit, making India the fourth ASAT power after the USA, Russia and China.
• The Space Based Surveillance (SBS-3) programme approved in October 2024 will put 52 satellites in orbit for defence, run through the Defence Space Agency (2019).
• NETRA is ISRO's network for tracking space debris; the start-up Digantara launched SCOT, a commercial space-surveillance satellite, in January 2025 on SpaceX's Transporter-12 mission.
• Internationally, the US SBIRS satellites detect missile launches by their infrared plume; GPS, NavIC and Galileo give the positioning that guided weapons depend on.
Do not mix these up
• Optical vs radar imaging satellites — optical (Cartosat) needs daylight and clear sky; radar (RISAT) images through cloud and at night.
• ASAT weapon vs ballistic missile defence — Mission Shakti used a BMD interceptor, but its target was a satellite in orbit, not an incoming missile.
Also asked from this topic: India's first anti-satellite missile test (Mission Shakti, 2019); the ISRO satellite giving high-resolution images for agriculture and forestry (Cartosat-3).
Space, Defence and Technology · International space missions and agencies

Q9. Which key discovery made by NASA's MAVEN mission has significantly advanced our understanding of how Mars lost much of its atmosphere?

  1. (a) Detection of liquid water beneath the Martian surface
  2. (b) Measurement of the rate at which solar wind strips away Mars' atmosphere
  3. (c) Discovery of methane plumes indicating active geology
  4. (d) Mapping of Martian polar ice caps' seasonal changes
Answer & solution

Answer: (b) Measurement of the rate at which solar wind strips away Mars' atmosphere

Answer: Option 2 — Measurement of the rate at which solar wind strips away Mars' atmosphere
MAVEN (Mars Atmosphere and Volatile EvolutioN) measured, in 2015, that the solar wind strips about 100 grams of gas per second from the top of the Martian atmosphere.
The loss jumps 10 to 20 times during solar storms.
Because Mars has no global magnetic field to deflect the solar wind, this slow leak over billions of years turned a thick, wet atmosphere into today's thin one.
Revision note — MAVEN and the exploration of Mars
• MAVEN was launched on 18 November 2013 on an Atlas V and entered Mars orbit on 22 September 2014 (21 September by US clocks) — two days before India's Mangalyaan arrived on 24 September 2014.
• It is an orbiter only; it studies the upper atmosphere and ionosphere and also acts as a communications relay for NASA's rovers.
• Mangalyaan (Mars Orbiter Mission), launched on 5 November 2013 by PSLV-C25, made India the first country to reach Mars orbit on its maiden attempt; it carried a Methane Sensor for Mars.
• The other options belong to other missions: ESA's Mars Express radar reported a liquid-water lake under the south polar cap in 2018, and methane was detected by the Curiosity rover.
• NASA's rovers: Sojourner (1997), Spirit and Opportunity (2004), Curiosity (2012) and Perseverance (2021), which carried the Ingenuity helicopter.
• Mars facts: two moons, Phobos and Deimos; the Red Planet from iron oxide dust; Olympus Mons, the largest volcano in the solar system; a day of about 24 h 37 min.
Do not mix these up
• MAVEN vs Mangalyaan — both reached Mars in September 2014; MAVEN is NASA's atmosphere-loss mission, Mangalyaan is ISRO's technology-demonstration orbiter.
• Solar wind vs solar flare — the solar wind is the continuous stream of charged particles from the Sun; a flare is a sudden burst of radiation that makes the stripping spike.
Also asked from this topic: India's first interplanetary mission (Mangalyaan); its launch year (2013; Mars orbit on 24 September 2014); the Aditya-L1 payload that studies the solar wind (ASPEX).
Space, Defence and Technology · International space missions and agencies

Q10. NASA's Dragonfly mission to Titan will primarily use which of the following capabilities to explore Titan's surface and study its prebiotic chemistry?

  1. (a) A rotorcraft lander capable of flying multiple locations to analyze surface composition
  2. (b) A stationary rover equipped with a drill to collect deep ice core samples
  3. (c) An orbiter with high-resolution radar to map Titan's methane lakes
  4. (d) A balloon that floats in Titan's atmosphere to study weather patterns
Answer & solution

Answer: (a) A rotorcraft lander capable of flying multiple locations to analyze surface composition

Answer: Option 1 — A rotorcraft lander capable of flying multiple locations to analyze surface composition
Dragonfly is a nuclear-powered rotorcraft — an eight-rotor drone the size of a car.
Titan's dense atmosphere and low gravity make flight easy, so it will hop between dozens of sites, sampling the organic-rich surface at each stop.
Revision note — Dragonfly and Titan
• Dragonfly is the fourth New Frontiers mission of NASA, selected in June 2019 after New Horizons, Juno and OSIRIS-REx; it is built and managed by the Johns Hopkins Applied Physics Laboratory.
• Launch is planned for July 2028 on a Falcon Heavy, with arrival at Titan in 2034; the landing zone is the Shangri-La dune fields near the Selk impact crater.
• Power comes from a Multi-Mission Radioisotope Thermoelectric Generator (MMRTG), because sunlight at Saturn is too weak for solar panels under Titan's haze.
• Titan is the largest moon of Saturn and the second largest in the Solar System after Jupiter's Ganymede.
• It is the only moon with a thick atmosphere (mostly nitrogen, some methane) and, apart from Earth, the only world with surface liquids — seas of liquid methane and ethane such as Kraken Mare.
• Titan was discovered by Christiaan Huygens in 1655; ESA's Huygens probe, carried by NASA's Cassini, landed on it on 14 January 2005 — the first landing in the outer Solar System.
• Dragonfly's goal is prebiotic chemistry: Titan's surface holds complex organic molecules over a crust of water ice that may hide a subsurface ocean.
Do not mix these up
• Dragonfly vs Europa Clipper — Dragonfly flies on Titan (Saturn) and lands; Europa Clipper, launched in October 2024, only orbits Jupiter and repeatedly flies past Europa.
• Titan vs Ganymede — both are larger than the planet Mercury, but only Titan has a thick atmosphere; Ganymede is the largest moon of all.
Also asked from this topic: the NASA mission that will explore Jupiter's moon Europa (Europa Clipper); the planet whose rings are disappearing as ring rain (Saturn).
Sports · Asian Games and Commonwealth Games

Q11. Which Indian has been awarded the most medals in Commonwealth Games history?

  1. (a) Sushil Kumar
  2. (b) Abhinav Bindra
  3. (c) Jaspal Rana
  4. (d) Vijender Singh
Answer & solution

Answer: (c) Jaspal Rana

Answer: Option 3 — Jaspal Rana
Shooter Jaspal Rana won 15 Commonwealth Games medals (9 gold, 4 silver, 2 bronze) between Victoria 1994 and Melbourne 2006, the most by any Indian.
His speciality was the 25 m centre-fire and standard pistol; his tally is one ahead of fellow shooter Samaresh Jung (14).
Revision note — India at the Commonwealth Games
• India's first appearance: 1934 London (British Empire Games) — wrestler Rashid Anwar won a bronze, the country's only medal there.
• First individual gold: Milkha Singh, 440 yards, Cardiff 1958.
• Best showing: New Delhi 2010, 101 medals (38 gold, 27 silver, 36 bronze), India's only second-place finish behind Australia.
• Birmingham 2022: 61 medals (22 gold); Sanket Sargar (weightlifting, 55 kg silver) won India's first medal of those Games; shooting was dropped from the programme.
• Sushil Kumar has three CWG wrestling golds (2010, 2014, 2018); Abhinav Bindra has four shooting golds, the last at Glasgow 2014.
• Vijender Singh took boxing bronze in 2006 and 2010 and silver in 2014.
• Next editions: Glasgow 2026 (a scaled-down Games after Victoria withdrew) and the centenary Games at Ahmedabad 2030.
Do not mix these up
• Most CWG medals (Jaspal Rana, 15) vs most Asian Games medals (P. T. Usha, 11) — different Games, different record-holders.
• Rashid Anwar (first CWG medal, 1934) vs Milkha Singh (first CWG gold, 1958) — a medal and a gold are two separate firsts.
Also asked from this topic: India's only medallist at the 1934 Games (Rashid Anwar); India's silver count at Delhi 2010 (27 of 101 medals); the first Indian medallist at Birmingham 2022 (Sanket Sargar).
Sports · Olympic Games

Q12. What was the historical significance of India's men's bronze medal in hockey at the Tokyo 2020 Olympics?

  1. (a) Ended 30-year drought
  2. (b) First-ever medal for India in hockey
  3. (c) First medal since 1980, after 41 years
  4. (d) Medal due to disqualification of another team
Answer & solution

Answer: (c) First medal since 1980, after 41 years

Answer: Option 3 — First medal since 1980, after 41 years
India beat Germany 5–4 in the bronze-medal match on 5 August 2021 (the Games were held in 2021 because of COVID-19).
The previous Olympic hockey medal was the gold at Moscow 1980, so the gap was 41 years — not 30, and far from a first-ever medal.
Revision note — India's Olympic hockey record
• India's men have 13 Olympic hockey medals: 8 gold, 1 silver (1960) and 4 bronze (1968, 1972, 2020, 2024).
• The golds came in 1928, 1932, 1936, 1948, 1952, 1956, 1964 and 1980.
• The six straight golds (1928–56) are one of the longest winning runs in Olympic team sport (US men's basketball won seven in a row, 1936–68); Dhyan Chand played in 1928, 1932 and 1936.
• 1948 London: first gold as an independent nation, beating Great Britain 4–0; 1980 Moscow gold under captain Vasudevan Baskaran.
• Tokyo 2020 captain Manpreet Singh; goalkeeper P. R. Sreejesh was the hero of the final minutes.
• India repeated the bronze at Paris 2024, beating Spain 2–1 in Sreejesh's farewell match.
• The women's team finished a best-ever fourth at Tokyo 2020.
Do not mix these up
• Tokyo 2020 (bronze, 41-year gap) vs Moscow 1980 (gold) — 1980 is the last gold; 2020 is the medal that ended the drought.
• Tokyo 2020 vs Tokyo 1964 — both in Tokyo, but 1964 was a gold (final against Pakistan), 2020 a bronze.
Also asked from this topic: the captain of the 1980 Moscow team (Vasudevan Baskaran); the first hockey gold after Independence (London 1948); the scorer of 10 goals against the USA in 1932 (Roop Singh).
Sports · Asian Games and Commonwealth Games

Q13. Which Asian Games edition marked the first introduction of Chess as a medal sport?

  1. (a) 1998 Bangkok
  2. (b) 2002 Busan
  3. (c) 2006 Doha
  4. (d) 2010 Guangzhou
Answer & solution

Answer: (c) 2006 Doha

Answer: Option 3 — 2006 Doha
Chess entered the Asian Games at Doha 2006, the 15th edition and the first held in an Arab country.
India's Koneru Humpy won the women's individual rapid gold there.
Revision note — Chess at the Asian Games
• Played at Doha 2006 and Guangzhou 2010, dropped for Incheon 2014 and Jakarta 2018, and brought back at Hangzhou 2022 (held in 2023).
• At Hangzhou 2022 India won two silvers — in the men's team event (behind Iran) and the women's team event (behind hosts China).
• Viswanathan Anand became India's first Grandmaster in 1988 and was the first winner of the Khel Ratna (1991–92); D. Gukesh became the youngest world champion in 2024.
• India won both team golds at the 45th Chess Olympiad (Budapest 2024); the 44th Olympiad was hosted at Chennai (Mamallapuram) in 2022.
• Asian Games hosts in the options: Bangkok 1998, Busan 2002, Doha 2006, Guangzhou 2010; the next are Aichi-Nagoya 2026 and Doha 2030.
• Other Asian Games debuts worth knowing: kabaddi at Beijing 1990, women's kabaddi at Guangzhou 2010 (India won gold), cricket at Guangzhou 2010.
Do not mix these up
• Doha 2006 (chess debut) vs Doha 2030 (next Doha Games) — the same city, 24 years apart.
• Chess Olympiad vs Asian Games chess — the Olympiad is FIDE's own biennial event; Asian Games chess is run under the Olympic Council of Asia.
Also asked from this topic: India's first Asian Games gold medallist (Sachin Nag, 1951); the most Asian Games medals by an Indian (P. T. Usha, 11); India's first chess Grandmaster (Anand, 1988).
Organisations and Headquarters · International organisations and headquarters

Q14. The International Solar Alliance primarily brings together nations that:

  1. (a) Have major fossil fuel reserves
  2. (b) Receive heavy monsoon rainfall
  3. (c) Experience consistent sunshine
  4. (d) Have high wind energy potential
Answer & solution

Answer: (c) Experience consistent sunshine

Answer: Option 3 — Experience consistent sunshine
The ISA was conceived as a coalition of the "sunshine countries" — nations lying wholly or partly between the Tropic of Cancer and the Tropic of Capricorn, where solar radiation is abundant through the year.
Its purpose is to pool demand, cut the cost of solar technology and finance, and spread solar energy in exactly these countries.
Revision note — International Solar Alliance
• Launched jointly by India and France on 30 November 2015 at COP21, Paris; its Framework Agreement came into force on 6 December 2017.
• Headquarters at the National Institute of Solar Energy (NISE), Gurugram, Haryana — the first treaty-based international organisation to be headquartered in India.
• Membership was first limited to the 121 countries between the tropics; the 2020 amendment opened it to all UN member states.
• Goal: mobilise USD 1 trillion of solar investment by 2030; its Towards 1000 strategy also aims at clean energy access for 1,000 million people.
• Ashish Khanna was elected Director General at the 7th Assembly, November 2024, succeeding Ajay Mathur.
• With the UK it launched One Sun One World One Grid (OSOWOG) at COP26, Glasgow (2021); the ISA has held observer status at the UN General Assembly since 2021.
Do not mix these up
• ISA vs IRENA — IRENA (Abu Dhabi, 2009) covers all renewables; the ISA (Gurugram, 2015) is solar-specific.
• ISA vs CDRI — both are India-led coalitions, but the Coalition for Disaster Resilient Infrastructure (2019) deals with infrastructure resilience, not energy.
Also asked from this topic: the partner country with which India launched the ISA (France); its headquarters city (Gurugram); its investment target (USD 1 trillion by 2030).
Organisations and Headquarters · International organisations and headquarters

Q15. Which of the following reflects India's major support to the International Solar Alliance?

  1. (a) Building nuclear plants abroad
  2. (b) Establishing coal reserves in Africa
  3. (c) Offering solar project funding and technical aid
  4. (d) Exporting fossil fuels to member countries
Answer & solution

Answer: (c) Offering solar project funding and technical aid

Answer: Option 3 — Offering solar project funding and technical aid
India backs the ISA with money, land and expertise: it funds the corpus, hosts the headquarters, extends lines of credit for solar projects in member countries and trains their engineers.
Nuclear plants, coal and fossil-fuel exports have nothing to do with a solar alliance.
Revision note — India's role in the ISA
• India contributed ₹175 crore (about USD 27 million) to the ISA corpus fund to build its secretariat and meet its expenses for the first five years.
• It gave 5 acres of land and the headquarters building on the NISE campus, Gwal Pahari, Gurugram.
• At the ISA Founding Conference, New Delhi (11 March 2018), India announced lines of credit of about USD 1.4 billion for 27 solar projects in 15 countries.
• The Solar Technology Application Resource Centres (STAR-C) and training under the ITEC programme provide the technical aid to member states.
• Flagship ISA programmes: Scaling Solar Applications for Agricultural Use, Affordable Finance at Scale, Solar Mini-Grids and Solar Rooftops.
• The Global Solar Facility, approved at the 5th Assembly (2022), is a payment-guarantee fund aimed first at Africa; India was its first contributor.
Also asked from this topic: the partner country with which India founded the ISA (France); the headquarters of the ISA (Gurugram); the Director General elected in November 2024 (Ashish Khanna).
Space, Defence and Technology · Launch vehicles and satellites

Q16. What was the name of India's first satellite, launched in 1975?

  1. (a) Aryabhata
  2. (b) Bhaskara
  3. (c) Cartosat-1
  4. (d) INSAT-1A
Answer & solution

Answer: (a) Aryabhata

Answer: Option 1 — Aryabhata
Aryabhata, named after the 5th-century astronomer, was launched on 19 April 1975 by a Soviet Kosmos-3M rocket from Kapustin Yar, taking India into the space age.
Bhaskara (1979), INSAT-1A (1982) and Cartosat-1 (2005) all came later.
Revision note — India's early satellites
• Aryabhata (1975): built by ISRO at Peenya, Bengaluru under Prof. U. R. Rao; weight 360 kg; meant for X-ray astronomy and solar physics.
• A power failure ended its experiments after 5 days; it re-entered the atmosphere in 1992, and it appeared on the ₹2 note.
• Bhaskara-I (1979): India's first experimental earth-observation satellite, also launched by the USSR.
• Rohini RS-1 (18 July 1980): the first satellite launched by an Indian rocket, the SLV-3, from Sriharikota, under A. P. J. Abdul Kalam.
• APPLE (1981): the first Indian communication satellite, launched by the European Ariane; INSAT-1A (1982) was the first of the INSAT series, launched by a US Delta rocket.
• IRS-1A (1988): first operational remote-sensing satellite; Cartosat-1 (2005) the first stereo-imaging cartography satellite, launched by PSLV.
• Aryabhata completed 50 years in April 2025.
Do not mix these up
• Aryabhata vs Rohini RS-1 — Aryabhata was the first Indian satellite (Soviet rocket, 1975); Rohini was the first satellite put up by an Indian launch vehicle (SLV-3, 1980).
• Aryabhata the satellite vs Aryabhata the astronomer — the mathematician (b. 476 CE, author of the Aryabhatiya) lived in the Gupta age.
Also asked from this topic: the year India's first satellite was launched (1975); the number of stages of the SLV-3 rocket (4); the satellite that completed 50 years in April 2025 (Aryabhata).
Space, Defence and Technology · Nuclear programme and institutions

Q17. Who is known as the father of the Indian nuclear programme?

  1. (a) C.V. Raman
  2. (b) Meghnad Saha
  3. (c) Homi J. Bhabha
  4. (d) Vikram Sarabhai
Answer & solution

Answer: (c) Homi J. Bhabha

Answer: Option 3 — Homi J. Bhabha
Homi Jehangir Bhabha founded the Tata Institute of Fundamental Research (1945) and was the first chairman of the Atomic Energy Commission (1948), laying out India's three-stage nuclear programme.
Vikram Sarabhai is the father of the Indian space programme, not the nuclear one.
Revision note — Homi J. Bhabha and India's nuclear programme
• Born 30 October 1909 in Bombay; a Cambridge-trained physicist known for Bhabha scattering (electron-positron scattering) and work on cosmic-ray showers.
• Founded TIFR in Mumbai in 1945 with Tata support, and became the first chairman of the Atomic Energy Commission on 10 August 1948.
• He was the first Secretary of the Department of Atomic Energy, set up on 3 August 1954 directly under the Prime Minister.
• The Atomic Energy Establishment, Trombay (1954) was renamed the Bhabha Atomic Research Centre (BARC) in 1967 after his death.
• Apsara (1956) at Trombay was Asia's first nuclear research reactor.
• Bhabha's three-stage programme: stage 1 natural uranium in PHWRs; stage 2 fast breeder reactors using plutonium (the PFBR at Kalpakkam); stage 3 thorium reactors using U-233.
• He died on 24 January 1966 when Air India's Kanchenjunga crashed on Mont Blanc; he received the Padma Bhushan in 1954 and the Adams Prize (1942).
Do not mix these up
• Homi Bhabha vs Vikram Sarabhai — Bhabha is the father of the nuclear programme (AEC, 1948); Sarabhai is the father of the space programme (INCOSPAR, 1962; ISRO, 1969).
• Homi Bhabha vs Raja Ramanna — Bhabha built the institutions; Raja Ramanna led the Pokhran-I test (Smiling Buddha, 18 May 1974), eight years after Bhabha's death.
Also asked from this topic: the new name of the Atomic Energy Establishment, Trombay (BARC, 1967); the date the Department of Atomic Energy was set up (3 August 1954); the site of India's Prototype Fast Breeder Reactor (Kalpakkam).
Sports · Athletics - events, rules and specifications

Q18. Which two categories mainly comprise field events?

  1. (a) Running and walking
  2. (b) Jumping and throwing
  3. (c) Sprinting and hurdling
  4. (d) Relay and marathon
Answer & solution

Answer: (b) Jumping and throwing

Answer: Option 2 — Jumping and throwing
In athletics the field events are the jumps and the throws, held on the field inside the track.
Every running event — sprints, hurdles, relays, middle and long distance — is a track event.
Revision note — The events of athletics
• Track events: sprints (100 m, 200 m, 400 m), middle distance (800 m, 1500 m), long distance (5000 m, 10,000 m).
• Also on the track: hurdles (110 m men / 100 m women, 400 m), the 3000 m steeplechase and relays (4 × 100 m, 4 × 400 m).
• Field events — jumps: long jump, triple jump, high jump, pole vault.
• Field events — throws: shot put, discus, javelin, hammer; a throw counts only if it lands inside the marked sector.
• Road events: the marathon (42.195 km) and the 20 km race walk, held outside the stadium.
• Combined events: the decathlon (10 events, men) and the heptathlon (7 events, women).
• The world body is World Athletics (formerly the IAAF, founded 1912, headquarters Monaco); in India it is the Athletics Federation of India.
• Neeraj Chopra (javelin) won Tokyo 2020 Olympic gold with 87.58 m, Paris 2024 silver and the 2023 World Championships gold at Budapest.
• Anju Bobby George won long jump bronze at the 2003 World Championships in Paris — India's first medal there.
Do not mix these up
• Track vs field — anything run is a track event; anything jumped or thrown is a field event.
• Steeplechase vs marathon — the 3000 m steeplechase is run inside the stadium on the track; the marathon is a road event outside it.
Also asked from this topic: the category under which all running events fall (track events); the track-and-field event NOT held outside the stadium (3000 m steeplechase); what decathlon and heptathlon are (combined athletics events).

Physics (2)

Magnetism and Magnetic Effects of Current · Earth's magnetism

Q19. Which of the following statements about the Van Allen Radiation Belts is incorrect?

  1. (a) The Van Allen belts are zones of charged particles trapped by Earth's magnetic field, predominantly composed of protons and electrons
  2. (b) The inner radiation belt lies closer to Earth and primarily contains high-energy protons, while the outer belt contains mostly electrons.
  3. (c) The radiation intensity of the Van Allen belts poses no operational hazard to satellites or human spaceflight missions passing through them.
  4. (d) Geomagnetic storms and solar activity can cause significant changes in the structure and intensity of the Van Allen belts.
Answer & solution

Answer: (c) The radiation intensity of the Van Allen belts poses no operational hazard to satellites or human spaceflight missions passing through them.

Answer: Option 3 — The radiation intensity of the Van Allen belts poses no operational hazard to satellites or human spaceflight missions passing through them.
The belts are a serious hazard: their energetic particles damage satellite electronics and solar cells and would give astronauts a dangerous dose.
Spacecraft are shielded or routed round them, the ISS orbits below them at about 400 km, and the Apollo crews crossed them as fast as possible.
The other three statements are correct descriptions of the belts.
Revision note — The Van Allen radiation belts
• Discovered in 1958 by James Van Allen from Geiger-counter data on Explorer 1, the first American satellite.
• Two main belts: the inner belt at about 1,000–6,000 km, rich in high-energy protons; the outer belt at about 13,000–60,000 km, dominated by electrons.
• The particles come from the solar wind and from cosmic-ray collisions in the atmosphere, trapped by the Earth's magnetic field (magnetosphere).
• The South Atlantic Anomaly, where the inner belt dips to a few hundred kilometres over South America, is where satellites suffer most upsets.
• NASA's Van Allen Probes (2012–2019) found a temporary third belt in 2013; geomagnetic storms swell and shrink the belts within hours.
• Polaris Dawn (September 2024), a private SpaceX crewed flight, deliberately flew through high-radiation zones to study the biological effects of space radiation.
Do not mix these up
• Van Allen belts vs ionosphere — the ionosphere (about 60–1,000 km) is a layer of the upper atmosphere that reflects radio waves; the belts lie far above it, in the magnetosphere.
• Van Allen belts vs auroras — auroras form when solar-wind particles guided by the field strike the upper atmosphere near the poles; the belts are the particles that stay trapped in space.
Also asked from this topic: the origin of the Van Allen belt particles (solar wind and cosmic rays, not the Sun alone); the cause of auroras near the poles (solar wind meeting Earth's magnetic field).
Units, Measurement & Dimensions · Derived units and units named after scientists

Q20. What is the SI unit of force?

  1. (a) Newton
  2. (b) Joule
  3. (c) Watt
  4. (d) Pascal
Answer & solution

Answer: (a) Newton

Answer: Option 1 — Newton
Force = mass × acceleration, so its SI unit is the newton (N), the force that gives a mass of 1 kg an acceleration of 1 m/s².
In base units 1 N = 1 kg·m/s².
Revision note — SI units named after scientists
• Newton (N) — force; 1 N = 1 kg·m/s²; the CGS unit is the dyne, and 1 N = 10⁵ dyne.
• Joule (J) — work and energy; 1 J = 1 N·m, the work done when a force of 1 N moves a body 1 m; the CGS unit is the erg (1 J = 10⁷ erg).
• Watt (W) — power; 1 W = 1 J/s; 1 horsepower = 746 W.
• Pascal (Pa) — pressure; 1 Pa = 1 N/m²; 1 atmosphere = 1.013 × 10⁵ Pa = 760 mm of Hg.
• Kilogram-force (kgf) is a gravitational unit: 1 kgf = 9.8 N, the weight of a 1 kg mass on Earth.
• Other named derived units: hertz (frequency), coulomb (charge), volt (potential), ohm (resistance), tesla (magnetic field), weber (magnetic flux).
Do not mix these up
• Newton vs newton-metre — the newton measures force; the newton-metre is the joule, a unit of work (and of torque).
• Newton vs kilogram — the kilogram is a unit of mass; the newton is a unit of force or weight (weight = mass × g).
Also asked from this topic: the combination of base units equivalent to the newton (kg·m/s²); the SI unit of pressure (pascal, N/m²); the SI unit of work (joule).

Biology (2)

Biotechnology and Applied Biology · DNA fingerprinting

Q21. Which of the following statements accurately reflects the principle, application, and limitations of DNA barcoding in biodiversity assessment and species identification?

  1. (a) DNA barcoding uses the full genome of an organism to identify species with 100% accuracy, making it a superior method to all traditional taxonomic techniques for both plants and animals.
  2. (b) DNA barcoding relies on sequencing a short, standardized region of the genome—such as the COI gene in animals or rbcL/matK in plants—to identify and classify species, but its effectiveness may be limited by lack of reference databases and low resolution in closely related species
  3. (c) DNA barcoding is limited only to microbial species and uses protein-coding genes to distinguish between strains, and thus has little relevance in conservation biology or forest management.
  4. (d) DNA barcoding eliminates the need for morphological or ecological data and is currently used as the sole identification tool in all global biodiversity conventions and trade regulations.
Answer & solution

Answer: (b) DNA barcoding relies on sequencing a short, standardized region of the genome—such as the COI gene in animals or rbcL/matK in plants—to identify and classify species, but its effectiveness may be limited by lack of reference databases and low resolution in closely related species

Answer: Option 2 — DNA barcoding relies on sequencing a short, standardized region of the genome … but its effectiveness may be limited …
A DNA barcode is a short, standard gene fragment, not the whole genome, matched against a reference library to name the species.
It is a complement to classical taxonomy, and it fails where the library is incomplete or where two species diverged too recently to differ in that fragment.
Revision note — DNA barcoding
• Proposed by Paul Hebert of the University of Guelph, Canada, in 2003; the idea is that one short sequence can identify a species the way a supermarket barcode identifies a product.
• Animals: about 650 base pairs of the mitochondrial gene COI (cytochrome c oxidase subunit I).
• Plants: the chloroplast genes rbcL and matK. Fungi: the nuclear ITS (internal transcribed spacer) region.
• Reference sequences are stored in BOLD (Barcode of Life Data System) and GenBank; an unknown sample is sequenced, compared and assigned to the closest match.
• Uses: wildlife forensics (seized ivory, shark fins, timber), food fraud (mislabelled fish), quarantine pests, and environmental DNA (eDNA) surveys of rivers and soils.
• Limits: incomplete reference databases, low resolution among closely related or recently diverged species, hybrids, and mitochondrial DNA being inherited only from the mother.
• In India the Zoological Survey of India (1916) and the Botanical Survey of India (1890) build the barcode libraries.
• The Biological Diversity Act, 2002 set up the National Biodiversity Authority at Chennai.
Do not mix these up
• DNA barcoding vs DNA fingerprinting — barcoding identifies a species from a standard gene; fingerprinting (Alec Jeffreys, 1984) tells apart individuals of one species, as in paternity and crime cases.
• Barcoding vs whole-genome sequencing — a barcode reads one short fragment; genome sequencing reads all the DNA and is far costlier.
Also asked from this topic: the main objective of the Genome India Project (to map the genetic diversity of Indians); what a gene is (a section of DNA that codes for a protein).
Diseases, Immunity and Health · First aid, ORS and everyday remedies

Q22. Why do we feel refreshed after drinking ORS during dehydration?

  1. (a) It supplies calories
  2. (b) It stimulates nerves
  3. (c) It restores electrolytes and water
  4. (d) It increases oxygen flow
Answer & solution

Answer: (c) It restores electrolytes and water

Answer: Option 3 — It restores electrolytes and water
Dehydration is the loss of water and salts (sodium, potassium, chloride) from the body, usually through diarrhoea, vomiting or heavy sweating.
ORS replaces exactly these; the small amount of glucose in it is there to pull sodium and water into the blood, not to feed the body.
Revision note — Oral Rehydration Solution (ORS)
• ORS works on sodium–glucose co-transport: the SGLT1 carrier in the small intestine absorbs sodium only along with glucose, and water follows the sodium by osmosis.
• This is why plain water, or salt water without sugar, is absorbed far less well.
• WHO and UNICEF low-osmolarity ORS (2002), per litre of clean water: sodium chloride 2.6 g, glucose 13.5 g, potassium chloride 1.5 g, trisodium citrate 2.9 g; total osmolarity 245 mOsm/L.
• Home substitute: six level teaspoons of sugar and half a teaspoon of salt in one litre of clean water.
• In childhood diarrhoea ORS is given with zinc — 20 mg a day for 14 days (10 mg for infants under six months) — which shortens the episode.
• Oral rehydration therapy was proven in the 1971 refugee camps of the Bangladesh war by Dr Dilip Mahalanabis of the cholera laboratory at Dhaka (now icddr,b).
• He was awarded the Padma Vibhushan posthumously in 2023.
• The Lancet called ORT "potentially the most important medical advance of the 20th century"; India observes ORS Day on 29 July.
Do not mix these up
• ORS vs glucose drink — a sweet drink gives calories but very little sodium; ORS is balanced so that glucose only helps sodium and water get absorbed.
• Dehydration vs malnutrition — dehydration is loss of water and electrolytes over hours; malnutrition is a long-term shortage of nutrients.

Chemistry (2)

Carbon and its Compounds · Ethanol and ethanoic acid

Q23. Which of the following statements regarding the mechanism and applications of vinegar is incorrect?

  1. (a) Vinegar acts as a natural preservative primarily due to the antimicrobial action of acetic acid, which lowers the pH and disrupts bacterial cell membranes.
  2. (b) The production of vinegar involves the fermentation of ethanol by Acetobacter species under aerobic conditions, resulting in the formation of acetic acid.
  3. (c) Vinegar effectively removes mineral deposits (like limescale) because acetic acid reacts with calcium carbonate to form water, carbon dioxide, and soluble acetate salts
  4. (d) The cleaning effectiveness of vinegar increases when mixed with baking soda due to the formation of a strong alkaline solution that breaks down grease and proteins.
Answer & solution

Answer: (d) The cleaning effectiveness of vinegar increases when mixed with baking soda due to the formation of a strong alkaline solution that breaks down grease and proteins.

Answer: Option 4 — The cleaning effectiveness of vinegar increases when mixed with baking soda due to the formation of a strong alkaline solution that breaks down grease and proteins.
The question asks for the incorrect statement.
Vinegar (an acid) and baking soda (a base) neutralise each other: CH₃COOH + NaHCO₃ → CH₃COONa + H₂O + CO₂.
The fizz is carbon dioxide; what remains is a near-neutral sodium acetate solution, not a strong alkali — mixing them cancels the cleaning power of both.
Options 1, 2 and 3 are all true: acetic acid preserves by lowering pH, it is made by Acetobacter under aerobic conditions, and it dissolves limescale (calcium carbonate).
Revision note — Vinegar and acetic acid
• Vinegar is a 5 to 8 per cent solution of acetic acid (ethanoic acid, CH₃COOH) in water; the name comes from the French vin aigre, sour wine.
• It is made in two fermentations: yeast turns sugar into ethanol without oxygen, then Acetobacter bacteria oxidise ethanol to acetic acid in the presence of oxygen.
• Acetic acid is a weak acid (it ionises only partly); vinegar has a pH of about 2.4 to 3.4, turns blue litmus red and reacts with carbonates to release carbon dioxide.
• With calcium carbonate: CaCO₃ + 2CH₃COOH → Ca(CH₃COO)₂ + H₂O + CO₂ — this is why it removes limescale from kettles and why it fizzes with chalk powder in the adulteration test for flour.
• As a preservative in pickles and sauces it lowers the pH so that most bacteria cannot grow; glacial acetic acid is the pure, water-free form that freezes at 16.6 °C.
• Ethanol is oxidised to ethanoic acid in the laboratory by acidified potassium dichromate or alkaline potassium permanganate.
Do not mix these up
• Acetobacter vs yeast — yeast makes alcohol (anaerobic); Acetobacter makes vinegar from that alcohol (aerobic).
• Baking soda vs washing soda — baking soda is sodium hydrogencarbonate (NaHCO₃), mildly alkaline; washing soda is sodium carbonate decahydrate (Na₂CO₃·10H₂O), strongly alkaline.
Also asked from this topic: the natural source of acetic acid (vinegar); the preservative used in pickles (a 5–8% acetic acid solution); the household test for chalk in flour (fizzing with vinegar).
Environmental Chemistry · Air quality management (AQI, NAAQS, NCAP, GRAP)

Q24. Which Indian city had the cleanest air (lowest AQI) as per CPCB data in early 2025?

  1. (a) Delhi
  2. (b) Tirunelveli
  3. (c) Ghaziabad
  4. (d) Chandigarh
Answer & solution

Answer: (b) Tirunelveli

Answer: Option 2 — Tirunelveli
In the CPCB's daily AQI bulletins of early 2025, Tirunelveli in Tamil Nadu repeatedly recorded the lowest AQI in the country, in the 'Good' band (0–50), thanks to coastal winds and little heavy industry.
Delhi and Ghaziabad sit at the opposite end of the table every winter; Chandigarh's air is moderate, not the cleanest.
Revision note — Air Quality Index in India
• The National AQI was launched by the CPCB in September 2014 under the slogan "One Number – One Colour – One Description"; live values are on the Sameer app.
• It is computed from 8 pollutants: PM2.5, PM10, NO₂, SO₂, CO, O₃, NH₃ and lead.
• Six bands: Good 0–50, Satisfactory 51–100, Moderate 101–200, Poor 201–300, Very Poor 301–400, Severe 401–500.
• The CPCB is a statutory body set up in September 1974 under the Water Act, 1974, working under the Ministry of Environment, Forest and Climate Change.
• The National Clean Air Programme (NCAP, 2019) covers 131 non-attainment cities and targets a 40 per cent cut in particulate matter by 2026 (from 2017 levels).
• In the IQAir World Air Quality Report 2024, Byrnihat (Assam–Meghalaya border) was the world's most polluted city and Delhi the most polluted capital.
Do not mix these up
• AQI vs PM2.5 concentration — the AQI is a 0–500 index combining eight pollutants; PM2.5 is one pollutant measured in µg/m³.
• CPCB vs NGT — the CPCB monitors and reports; the National Green Tribunal (2010) is a court that adjudicates environmental cases.
Also asked from this topic: the agency that monitors the AQI in Indian cities (Central Pollution Control Board); the number of pollutants in India's AQI (8); the AQI range for 'Good' air (0–50).

Economics (9)

Money and Banking · Monetary policy tools (repo, reverse repo, CRR, SLR, MSF, bank rate)

Q25. During periods of excess liquidity in the banking system, what role does the reverse repo rate play in the RBI's monetary policy operations, and what impact does it have on commercial banks?

  1. (a) It encourages banks to borrow more from the RBI and lend to the public
  2. (b) It allows the RBI to absorb surplus liquidity by offering an interest rate on funds parked by banks, thus discouraging excessive lending
  3. (c) It forces banks to invest solely in foreign assets, reducing inflation risk
  4. (d) It mandates that all banks maintain higher CRR, thereby tightening liquidity
Answer & solution

Answer: (b) It allows the RBI to absorb surplus liquidity by offering an interest rate on funds parked by banks, thus discouraging excessive lending

Answer: Option 2 — It allows the RBI to absorb surplus liquidity by offering an interest rate on funds parked by banks, thus discouraging excessive lending
The reverse repo rate is the rate at which the RBI borrows from banks — banks park their surplus cash with the RBI against government securities and earn interest.
When the system has too much money, a higher reverse repo rate makes parking funds with the RBI attractive, so liquidity is absorbed and banks lend less freely.
Revision note — Repo, reverse repo and the liquidity corridor
• Repo rate: the RBI lends to banks against government securities — the main policy rate.
• It is set by the Monetary Policy Committee (MPC) of six members, with an inflation target of 4 per cent (± 2 per cent).
• Reverse repo rate: the RBI borrows from banks; it has stayed at 3.35 per cent since May 2020 and is now used only for occasional variable-rate auctions.
• Since April 2022 the floor of the corridor is the Standing Deposit Facility (SDF) at repo minus 25 basis points, where banks park money without collateral.
• The ceiling is the Marginal Standing Facility (MSF) at repo plus 25 basis points.
• The repo rate stood at 5.25 per cent after the MPC's cut of 25 basis points on 5 December 2025.
• Both operations run under the Liquidity Adjustment Facility (LAF), introduced in June 2000 on the recommendation of the Narasimham Committee II.
• Other quantitative tools: CRR (cash kept with the RBI, no interest), SLR (liquid assets kept by the bank itself), bank rate and open market operations.
• Moral suasion and margin requirements are qualitative tools.
Do not mix these up
• Repo vs reverse repo — in a repo the RBI lends and injects liquidity; in a reverse repo the RBI borrows and absorbs liquidity. The reverse repo rate is always the lower of the two.
• Reverse repo vs SDF — both absorb liquidity, but the reverse repo needs government securities as collateral while the SDF does not.
Also asked from this topic: the rate at which the RBI borrows from banks (reverse repo rate); the RBI's main liquidity tool (repo rate); the effect of a repo rate rise (credit becomes costlier).
Public Finance - Budget and Taxation · Indirect taxes and GST

Q26. What was the primary rationale behind introducing the Value Added Tax (VAT) system in India in the early 2000s, and how did it address the inefficiencies of the earlier sales tax regime?

  1. (a) VAT was designed to increase tax rates and reduce state autonomy in taxation
  2. (b) VAT replaced customs duties and allowed the Centre to collect direct taxes for states
  3. (c) VAT introduced a multi-point taxation system that minimized the cascading effect of taxes and promoted input tax credit across the supply chain
  4. (d) VAT ensured uniform pricing of agricultural produce and abolished excise duties
Answer & solution

Answer: (c) VAT introduced a multi-point taxation system that minimized the cascading effect of taxes and promoted input tax credit across the supply chain

Answer: Option 3 — VAT introduced a multi-point taxation system that minimized the cascading effect of taxes and promoted input tax credit across the supply chain
Under the old sales tax, tax was charged on the full price at every sale, so tax was paid on tax already paid — the cascading effect.
VAT taxes only the value added at each stage: the seller deducts the tax already paid on inputs (input tax credit), so the final burden equals a single tax on the final price.
Revision note — VAT in India
• State VAT replaced state sales tax from 1 April 2005 in 21 states; Haryana had led the way in 2003 and Uttar Pradesh was the last to join in 2008.
• It was designed by the Empowered Committee of State Finance Ministers, chaired by Dr Asim Dasgupta, the Finance Minister of West Bengal.
• Rates were kept simple: 4 per cent (later 5 per cent) on essentials and industrial inputs, 12.5 per cent as the general rate, and 1 per cent on gold, silver and precious stones.
• At the Centre, the same idea had come earlier as MODVAT (1986) on excise duty, renamed CENVAT in 2000, and service tax was introduced in 1994.
• Sales tax vs VAT: sales tax is a single-point levy with no credit; VAT is a multi-point levy with set-off of input tax, so it is self-policing — every buyer wants an invoice to claim credit.
• On 1 July 2017 the Goods and Services Tax subsumed state VAT, central excise and service tax; VAT still applies only to petroleum products and alcohol for human consumption.
Do not mix these up
• VAT vs GST — VAT was a state tax on goods only, with no credit across state borders; GST is a dual, destination-based tax on goods and services with a seamless credit chain across India.
• Cascading vs double taxation — cascading is tax on tax along a supply chain; double taxation is the same income being taxed twice by two authorities.
Also asked from this topic: why states adopted VAT in 2005 (to minimise the cascading effect of indirect taxes); the single CENVAT rate of 2001–02 (16 per cent); the date GST was launched (1 July 2017).
Public Finance - Budget and Taxation · Indirect taxes and GST

Q27. Which of the following fiscal reforms post-1991 played the most crucial role in improving tax efficiency and expanding the tax base in India?

  1. (a) Nationalization of banks
  2. (b) Introduction of Value Added Tax (VAT) and later the Goods and Services Tax (GST)
  3. (c) Increase in agricultural subsidies
  4. (d) Abolition of wealth tax
Answer & solution

Answer: (b) Introduction of Value Added Tax (VAT) and later the Goods and Services Tax (GST)

Answer: Option 2 — Introduction of Value Added Tax (VAT) and later the Goods and Services Tax (GST)
The post-1991 tax strategy was lower rates, fewer exemptions, wider base — and its centrepiece on the indirect side was the move from sales tax to VAT (2005) and then to GST (2017).
Bank nationalisation belongs to 1969 and 1980, subsidies widen spending rather than the tax base, and the wealth tax was a tiny levy whose abolition in 2015 hardly changed collections.
Revision note — Tax reforms after 1991
• The Tax Reforms Committee (1991) under Raja J. Chelliah recommended moderate rates, a broader base and simpler laws; its reports came in 1992–93.
• Direct taxes: income tax slabs were cut to three rates with a top rate of 30 per cent in the 1997–98 "Dream Budget" of P. Chidambaram; corporate tax was lowered and PAN made compulsory.
• Indirect taxes: the peak customs duty fell from over 300 per cent in 1991 to 10 per cent by 2007–08.
• MODVAT credit was widened and became CENVAT (2000); service tax began in 1994 on three services.
• State VAT replaced sales tax from 1 April 2005; the Kelkar Task Forces (2002) proposed a national GST, first announced in the 2006–07 Budget by P. Chidambaram.
• GST came through the Constitution (101st Amendment) Act, 2016 — Articles 246A, 269A and 279A — and was launched on 1 July 2017 as One Nation, One Tax.
• The GST Council under Article 279A is chaired by the Union Finance Minister.
• Direct tax collections and the number of income-tax filers have grown many times since 1991, the clearest sign of a widening base; the FRBM Act, 2003 added the fiscal discipline side of the reform.
Do not mix these up
• Tax base vs tax rate — the base is the number of taxpayers and transactions covered; the rate is the percentage charged. Post-1991 reforms cut rates to widen the base.
• Wealth tax vs estate duty — wealth tax (1957) was abolished in the 2015–16 Budget and replaced by a 2 per cent surcharge on the super-rich; estate duty had already gone in 1985.
Also asked from this topic: the chairman of the Tax Reforms Committee, 1991 (Raja J. Chelliah); when the Kelkar task force was set up (2002–03); the amendment that brought GST (101st Amendment Act, 2016).
Industry and Infrastructure · Industrial Policy Resolutions (1948, 1956, 1991)

Q28. Which of the following correctly links the concept of “commanding heights of the economy” with India's planning model post-independence?

  1. (a) It refers to state control over agriculture and consumer services to ensure equitable distribution.
  2. (b) It highlights the emphasis on decentralised village economies advocated during the Seventh Plan.
  3. (c) It indicates the state ownership of key sectors such as steel, coal, and infrastructure, seen as essential for national development and security.
  4. (d) It denotes the prioritisation of foreign investment in high-value sectors through joint ventures.
Answer & solution

Answer: (c) It indicates the state ownership of key sectors such as steel, coal, and infrastructure, seen as essential for national development and security.

Answer: Option 3 — It indicates the state ownership of key sectors such as steel, coal, and infrastructure, seen as essential for national development and security.
"Commanding heights" meant that the public sector would own and run the basic and strategic industries — steel, coal, heavy machinery, power, railways, defence — on which the rest of the economy depends.
Private enterprise was left with consumer goods and light industry; agriculture was never nationalised.
Revision note — Commanding heights and the planning model
• The phrase was coined by Lenin in 1922 for the state keeping control of key industries.
• India adopted it through the Industrial Policy Resolution of 30 April 1956, often called the economic constitution of India.
• The 1956 Resolution had three schedules: Schedule A — 17 industries reserved for the state (arms, atomic energy, iron and steel, coal, heavy machinery, aircraft, railways, telephones).
• Schedule B — 12 industries to be progressively state-owned; Schedule C — the rest, open to the private sector.
• It formed the basis of the Second Five-Year Plan (1956–61), built on the Mahalanobis model of rapid industrialisation through heavy and capital-goods industries.
• The three public steel plants of that era — Bhilai (Soviet aid), Rourkela (West German aid) and Durgapur (British aid) — are the classic examples; coal mines were nationalised in 1971–73.
• The 1948 Resolution had first announced the mixed economy; the 1991 New Industrial Policy reversed the doctrine, cutting reserved industries from 17 to 8.
• Today only atomic energy and railway operations remain reserved for the public sector.
• Option 2 is wrong on its dates too: decentralised village industries were the theme of the Gandhian plan, not the Seventh Plan (1985–90), which stressed food, work and productivity.
Do not mix these up
• IPR 1948 vs IPR 1956 — 1948 introduced the mixed economy idea; 1956 gave the public sector the commanding heights and is the one the plans followed.
• Public sector reservation vs licensing — reservation kept an industry only for the state; licensing (under the IDR Act, 1951) controlled what private firms could produce.
Also asked from this topic: the plan built on the 1956 Resolution and its commanding-heights doctrine (Second Five-Year Plan); the commanding heights of 1950–80 (heavy industry, steel and energy).
Planning and NITI Aayog · Indian economy at independence and the 1950-90 phase

Q29. Which of the following statements best captures the economic rationale behind the pursuit of ‘self-reliance’ in India's development strategy from 1947 to 1990, and its broader implications on trade and industrial policy?

  1. (a) It aimed at complete economic isolation by banning all foreign trade and investment
  2. (b) It sought to reduce dependence on foreign technology, capital, and imports by developing indigenous industrial capacity, thereby promoting economic sovereignty within a mixed economy framework
  3. (c) It prioritized maximizing exports to achieve rapid growth through global integration
  4. (d) It promoted full capital account convertibility and free-market policies from the outset
Answer & solution

Answer: (b) It sought to reduce dependence on foreign technology, capital, and imports by developing indigenous industrial capacity, thereby promoting economic sovereignty within a mixed economy framework

Answer: Option 2 — It sought to reduce dependence on foreign technology, capital, and imports by developing indigenous industrial capacity, thereby promoting economic sovereignty within a mixed economy framework
Fresh from colonial rule, India's planners feared that depending on imports and foreign capital would again mean depending on foreign powers.
So the strategy was import substitution inside a mixed economy — build capacity at home, protect it with tariffs and licences, and let the state own heavy industry.
It was never a total ban on trade, and certainly not export-led growth.
Revision note — Self-reliance in the planning era (1951–91)
• Self-reliance was one of the four long-term goals of the Five-Year Plans, with growth, modernisation and equity; it meant reducing dependence on foreign aid, imports and foreign capital.
• The trade policy was inward-looking import substitution: high tariffs and quantitative restrictions protected "infant" domestic industries from foreign competition.
• Industry was steered by licensing under the Industries (Development and Regulation) Act, 1951, the MRTP Act, 1969 on large houses, and the FERA, 1973, which capped foreign equity at 40 per cent.
• The framework was the mixed economy of the 1948 and 1956 Industrial Policy Resolutions: the public sector held the commanding heights.
• The Mahalanobis model of the Second Plan (1956–61) favoured heavy industry.
• Costs: exports were neglected — India's share of world exports fell from about 2 per cent in 1950 to about 0.5 per cent by the 1980s — and the licence-permit raj bred inefficiency and shortages.
• The Fourth Plan (1969–74) spoke of "growth with stability and progressive achievement of self-reliance"; the Fifth Plan (1974–79) paired self-reliance with Garibi Hatao.
• The 1991 reforms replaced the strategy with liberalisation, privatisation and globalisation; the Atmanirbhar Bharat call of 2020 revived the word "self-reliance" but within an open economy.
Do not mix these up
• Self-reliance vs self-sufficiency — self-sufficiency means producing everything at home; self-reliance meant reducing dependence while still trading and taking aid selectively.
• Import substitution vs export promotion — the planning era chose the first; the East Asian economies and post-1991 India moved to the second.
Also asked from this topic: why import substitution was adopted (to protect infant domestic industries); why self-reliance was a goal of early planning (to reduce dependence on foreign aid and imports).
Planning and NITI Aayog · Five-Year Plans - objectives and models

Q30. Which of the following best encapsulates the major objective of the Fifth Five Year Plan (1974–1979), and how did it signify a shift in India's development priorities compared to earlier plans?

  1. (a) Focus on rapid industrialization through foreign direct investment and export promotion
  2. (b) Emphasis on poverty alleviation (Garibi Hatao), social justice, and redistribution of wealth alongside economic growth
  3. (c) Complete deregulation of the economy and reduction in state intervention
  4. (d) Prioritization of heavy industries and capital goods production to build self-reliance
Answer & solution

Answer: (b) Emphasis on poverty alleviation (Garibi Hatao), social justice, and redistribution of wealth alongside economic growth

Answer: Option 2 — Emphasis on poverty alleviation (Garibi Hatao), social justice, and redistribution of wealth alongside economic growth
The Fifth Plan made removal of poverty and self-reliance its two declared aims — the first time a plan put the poor, rather than output, at the centre.
Earlier plans (especially the Second) had chased growth through heavy industry; the Fifth added the Minimum Needs Programme to reach basic services directly to the poor.
Revision note — The Fifth Five-Year Plan (1974–79)
• Period 1974–79; the draft was prepared by D. P. Dhar as Deputy Chairman of the Planning Commission.
• Twin objectives: Garibi Hatao (removal of poverty) and attainment of self-reliance; the slogan itself came from Indira Gandhi's 1971 election campaign.
• The Minimum Needs Programme (1974) covered elementary education, rural health, drinking water, rural roads, rural housing and electrification.
• The Twenty-Point Programme was announced in 1975, during the Emergency, to give the anti-poverty drive a concrete list.
• The plan was terminated a year early, in 1978, by the Janata government, which replaced it with a Rolling Plan (1978–80); the Sixth Plan then began in 1980.
• Contrast: the Second Plan (1956–61) followed the Mahalanobis model and prioritised heavy industry.
• The Fourth Plan (1969–74) stressed growth with stability and self-reliance, cutting dependence on foreign aid.
Do not mix these up
• Garibi Hatao (Fifth Plan) vs Growth with stability (Fourth Plan) — the Fourth spoke of stability and self-reliance; direct poverty removal became the headline only in the Fifth.
• Rolling Plan vs Plan Holiday — the Rolling Plan (1978–80) replaced the Fifth; the Plan Holiday (1966–69) came after the Third.
Also asked from this topic: the plan that introduced the Minimum Needs Programme (Fifth); the model behind the Second Plan (Mahalanobis); the meaning of a plan holiday (the break in planning, 1966–69).
Government Schemes and Economic Reports · Global indices - publishers and methodology

Q31. Despite India's reforms in taxation and digital governance, the Ease of Doing Business (EoDB) ranking has been discontinued by the World Bank. What led to this decision?

  1. (a) Lack of data on digital startups
  2. (b) Disputes between BRICS countries
  3. (c) Accusations of data manipulation involving certain countries
  4. (d) Overlapping with IMF's structural index
Answer & solution

Answer: (c) Accusations of data manipulation involving certain countries

Answer: Option 3 — Accusations of data manipulation involving certain countries
On 16 September 2021 the World Bank scrapped its Doing Business report after an independent review by the law firm WilmerHale.
It found that senior management had pressed staff to alter the scores of China, Saudi Arabia, the UAE and Azerbaijan in the 2018 and 2020 editions.
The ethics of the data, not India's reforms or any BRICS dispute, ended the ranking.
Revision note — Ease of Doing Business and its successor
• The report ran from 2003 to 2020, ranking 190 economies on 10 indicators given equal weight.
• The indicators: starting a business, construction permits, electricity, property, credit, protecting minority investors, paying taxes, trading across borders, enforcing contracts and resolving insolvency.
• It measured a formal firm in each country's largest business city (for India, Mumbai and Delhi), so the informal sector was excluded.
• India's climb: 142nd (2015 report) to 63rd (Doing Business 2020), helped by GST (2017), the Insolvency and Bankruptcy Code (2016) and single-window clearances.
• New Zealand topped the last edition (Doing Business 2020).
• The successor is Business Ready (B-READY), first published in October 2024 for 50 economies; it scores the regulatory framework, public services and operational efficiency.
• Later B-READY rounds are to bring in India.
• At home, DPIIT runs the Business Reforms Action Plan that ranks Indian states on ease of doing business.
Do not mix these up
• Doing Business (World Bank) vs Global Competitiveness Report (WEF) — the discontinued ranking was the World Bank's; the WEF report is a separate index.
• Ease of Doing Business vs Ease of Living Index — the latter is an Indian MoHUA ranking of cities, unrelated to the World Bank.
Also asked from this topic: why the EoDB report was discontinued (data manipulation, 2021); how its 10 indicators were weighted (equally); why the informal sector was excluded (not measurable consistently).
Poverty, Unemployment and Human Development · Types of unemployment

Q32. The high percentage of cultivators in rural India signifies which structural problem?

  1. (a) Disguised unemployment
  2. (b) Educational backwardness
  3. (c) Urban migration
  4. (d) Higher wages
Answer & solution

Answer: (a) Disguised unemployment

Answer: Option 1 — Disguised unemployment
When far more people work a plot than the plot needs, the extra hands add nothing to output — their marginal productivity is zero — yet they appear employed.
Indian agriculture carries about 46 per cent of the workforce but produces only about 18 per cent of GVA; that gap is the signature of disguised unemployment.
Revision note — Types of unemployment
• Disguised (hidden): more workers than needed, marginal product zero; typical of rural agriculture and family enterprises.
• Seasonal: work exists only in certain months — sowing and harvesting, sugar mills, tourism.
• Structural: a mismatch between the skills available and the skills demanded, as when technology changes.
• Frictional: the short gap while moving between jobs; cyclical: caused by a downturn in demand, more common in industrial economies.
• Open unemployment is visible and counted; educated unemployment is high among graduates in India.
• The NSSO / PLFS measure unemployment by three yardsticks — Usual Status (365 days), Current Weekly Status (7 days) and Current Daily Status.
• Census 2011 counted 11.9 crore cultivators and 14.4 crore agricultural labourers; MGNREGA (2005) and diversification into agro-industry are the standard remedies.
Do not mix these up
• Disguised unemployment vs underemployment — underemployment means working below capacity (hours, skill or pay); disguised unemployment is its extreme case where the extra worker contributes nothing.
• Disguised vs seasonal — the disguised worker is surplus all year; the seasonal worker is idle only in the off-season.
Also asked from this topic: the sector where disguised unemployment is found (agriculture); its defining feature (marginal productivity of the extra worker = zero); working below capacity (underemployment).
Basic Concepts and Economic Systems · Economic systems (capitalist, socialist, mixed)

Q33. What was the main model adopted for Indian economic planning after Independence?

  1. (a) Pure capitalism
  2. (b) Mixed economy
  3. (c) Pure socialism
  4. (d) Laissez-faire
Answer & solution

Answer: (b) Mixed economy

Answer: Option 2 — Mixed economy
Independent India chose a mixed economy: the public sector took the commanding heights (heavy industry, infrastructure, defence) while the private sector worked alongside it.
Both were steered by the Five-Year Plans.
Nehru rejected the Soviet model because it left no room for private enterprise, and rejected pure capitalism because the market alone would not build basic industry in a poor country.
Revision note — India's planning model after 1947
• The Industrial Policy Resolution of 6 April 1948 was the first statement of the mixed economy, dividing industries between the state and private hands.
• The Planning Commission was set up by a Cabinet resolution on 15 March 1950 with the Prime Minister as chairman; it was replaced by NITI Aayog on 1 January 2015.
• The First Plan (1951–56) followed the Harrod-Domar model and stressed agriculture and irrigation.
• The Second Plan (1956–61) followed the Mahalanobis model and stressed heavy and capital-goods industry.
• The Avadi session of Congress (1955) adopted the goal of a socialistic pattern of society.
• The Industrial Policy Resolution of 1956, called the economic constitution of India, sorted industries into Schedules A, B and C.
• Public-sector giants of this era: Bhilai (USSR), Rourkela (West Germany) and Durgapur (UK) steel plants under the Second Plan.
• The 1991 LPG reforms (liberalisation, privatisation, globalisation) shifted the balance towards the market, but India remains a mixed economy.
Do not mix these up
• Mixed economy vs socialistic pattern of society — the mixed economy is the system (public and private sectors together); the socialistic pattern was the declared goal of that system after Avadi, 1955.
• Planning Commission vs Finance Commission — the Planning Commission (now NITI Aayog) drew up plans; the Finance Commission (Article 280) recommends how tax revenue is shared between Centre and states.
Also asked from this topic: the economic system India adopted after Independence (mixed economy); the year of independent India's first Industrial Policy (1948); the Five-Year Plan based on the Mahalanobis model (Second, 1956–61).

Geography (7)

India - Drainage System · Lakes of India

Q34. Which of the following lakes is a saltwater lake and is also the largest inland saltwater lake in India?

  1. (a) Dal Lake
  2. (b) Wular Lake
  3. (c) Chilika Lake
  4. (d) Sambhar Lake
Answer & solution

Answer: (d) Sambhar Lake

Answer: Option 4 — Sambhar Lake
Sambhar Lake, about 80 km west of Jaipur in Rajasthan, is India's largest inland saline lake.
Chilika is bigger, but it is a coastal lagoon open to the Bay of Bengal, not an inland lake; Dal and Wular are freshwater.
Revision note — Sambhar and the other named lakes
• Sambhar: area 190–230 sq km depending on the season, fed by the Mendha, Rupangarh, Khandel and Karian streams; a Ramsar site since 1990.
• It produces about 9 per cent of India's salt, worked by Sambhar Salts Ltd, a Hindustan Salts subsidiary; it is a major wintering ground for flamingos.
• Chilika (Odisha): India's largest brackish-water lagoon and Asia's largest; India's first Ramsar site (1981), famous for Irrawaddy dolphins and Nalabana bird sanctuary.
• Wular (J&K): India's largest freshwater lake, on the Jhelum, in Bandipora district.
• Dal (Srinagar): freshwater; Shalimar Bagh (Jahangir, 1619) and Nishat Bagh stand on its banks.
• Other salt lakes: Pangong Tso (Ladakh), Tso Moriri (Ladakh), Lonar (Maharashtra, a meteorite-crater lake).
Do not mix these up
• Chilika vs Sambhar — Chilika is the largest saltwater (brackish) lake overall; Sambhar is the largest inland saltwater lake. Read for the word inland.
• Wular vs Dal — both are in Kashmir and freshwater, but Wular is the largest freshwater lake in India; Dal is the tourist lake in Srinagar.
Also asked from this topic: the largest saltwater lake in India (Chilika); the state of Sambhar Lake (Rajasthan); the largest freshwater lake in India (Wular).
India - Drainage System · Drainage patterns, basins and river terminology

Q35. The Peninsular rivers have a distinct seasonal flow pattern compared to the Himalayan rivers. Which of the following is a primary reason for their non-perennial nature?

  1. (a) Their flow is controlled by dams
  2. (b) They originate from melting glaciers
  3. (c) They depend largely on monsoon rainfall
  4. (d) They have large catchment areas
Answer & solution

Answer: (c) They depend largely on monsoon rainfall

Answer: Option 3 — They depend largely on monsoon rainfall
Peninsular rivers rise on the plateau, where there is no snow or glacier, so they are fed only by rain.
They swell in the south-west monsoon (June–September) and shrink to a trickle in the dry months — a seasonal, non-perennial regime.
Revision note — Himalayan vs Peninsular drainage
• Himalayan rivers (Indus, Ganga, Brahmaputra) are snow-fed and rain-fed, hence perennial; they are young, still cutting V-shaped valleys, gorges and meanders.
• Peninsular rivers flow over hard, old crystalline rock in broad, shallow, graded valleys; their courses are nearly fixed and they do not meander much.
• The main water divide of the Peninsula is the Western Ghats; the Godavari, Krishna, Mahanadi and Kaveri flow east into the Bay of Bengal and form deltas.
• The Narmada and Tapi flow west through rift valleys into the Arabian Sea and form estuaries, not deltas.
• The Godavari (about 1,465 km) is the longest Peninsular river, called the Dakshin Ganga; it rises at Trimbakeshwar, Nashik.
• The Kaveri is the one Peninsular river that is almost perennial, because its basin gets rain from both monsoons (south-west upstream, north-east downstream).
Do not mix these up
• Perennial vs non-perennial — perennial rivers flow all year (snow plus rain); non-perennial rivers dry up outside the monsoon (rain only).
• Delta vs estuary — the east-flowing rivers build deltas; the west-flowing Narmada and Tapi end in estuaries because of the rift valleys and strong tides.
Also asked from this topic: the river called Dakshin Ganga (Godavari); Peninsular rivers falling into the Arabian Sea (Narmada and Tapi); streams of the Thar Desert (ephemeral — most vanish into the sand).
India - Drainage System · Himalayan river systems (Indus, Ganga, Brahmaputra)

Q36. In Tibet, which river is known as 'Singi Khamban' or the 'Lion's Mouth'?

  1. (a) Indus
  2. (b) Brahmaputra
  3. (c) Ganga
  4. (d) Sutlej
Answer & solution

Answer: (a) Indus

Answer: Option 1 — Indus
The Indus rises in Tibet near Lake Mansarovar from the Bokhar Chu glacier in the Kailash range, where the Tibetans call it Singi Khamban (Senge Khabab), the Lion's Mouth.
Each great river of the Mansarovar region has such an animal name — the Brahmaputra is the Tamchok Khambab (Horse's Mouth), the Satluj the Langchen Khambab (Elephant's Mouth).
Revision note — The Indus river
• Source: near Mansarovar, at about 5,180 m, in the Kailash range of Tibet; total length 2,880 km, of which 1,114 km is in India.
• Enters India at Demchok, Ladakh, flows north-west between the Ladakh and Zaskar ranges, cuts a deep gorge near Nanga Parbat and enters Pakistan near Chillas.
• Himalayan tributaries: Zaskar, Shyok, Nubra, Hunza, Gilgit; the Punjab tributaries Jhelum, Chenab, Ravi, Beas and Satluj join it together as the Panjnad at Mithankot.
• Falls into the Arabian Sea east of Karachi; the Harappan cities Mohenjo-daro and Harappa stood on the Indus and its tributary the Ravi.
• Indus Waters Treaty, 1960 (Nehru and Ayub Khan, brokered by the World Bank): India got the eastern rivers Ravi, Beas, Satluj; Pakistan the western rivers Indus, Jhelum, Chenab.
• The name India itself comes from Sindhu, which the Persians called Hindu and the Greeks Indos.
Do not mix these up
• Indus vs Brahmaputra vs Satluj — all three rise near Mansarovar, but only the Indus is the Lion's Mouth; the Brahmaputra (Yarlung Tsangpo) is the Horse's Mouth and the Satluj the Elephant's Mouth.
• Lion's Mouth vs Peacock's Mouth — the Karnali (Ghaghara) is the Mapchu Khambab, the Peacock's Mouth.
Also asked from this topic: the Punjab rivers of the Indus system (Jhelum, Chenab, Ravi, Beas, Satluj); the year of the Indus Waters Treaty (1960); the river on which Mohenjo-daro stands (Indus).
India - Drainage System · Lakes of India

Q37. Lakes predominantly formed by the action of glaciers are typically found in which major geographical region of India?

  1. (a) The Thar Desert
  2. (b) The coastal plains
  3. (c) The Himalayan region
  4. (d) The Deccan Plateau
Answer & solution

Answer: (c) The Himalayan region

Answer: Option 3 — The Himalayan region
A glacier scoops out a hollow (a cirque) or leaves a wall of debris (a moraine) that dams the meltwater; such lakes can exist only where glaciers exist — the high Himalaya.
The desert has playas, the coast has lagoons and the plateau has crater and reservoir lakes, none of them glacial.
Revision note — Lakes of India by origin
• Glacial lakes: Gurudongmar and Tsomgo (Changu) in Sikkim, Chandra Tal and Suraj Tal in Himachal, Roopkund and Hemkund in Uttarakhand — mostly cirque (tarn) or moraine-dammed lakes.
• Tectonic lakes: Wular (J&K), the largest freshwater lake of India, and Pangong Tso in Ladakh, a brackish lake shared with China.
• Lagoons: Chilika (Odisha), India's largest brackish lagoon, Pulicat (AP–TN) and Vembanad (Kerala) — coastal lakes cut off by sand bars.
• Oxbow lakes: cut-off meanders on the Ganga plain, such as Kanwar (Kabartal) in Bihar, the largest oxbow lake in Asia.
• Crater lake: Lonar (Maharashtra), formed by a meteorite impact in the Deccan basalt.
• Man-made: Gobind Sagar (Bhakra dam), Hirakud and Nagarjuna Sagar reservoirs.
• Glacial lakes bring the hazard of a GLOF (glacial lake outburst flood) — the South Lhonak lake burst in Sikkim on 4 October 2023 and devastated the Teesta valley and the Chungthang dam.
Do not mix these up
• Wular vs Dal — both are in Kashmir, but Wular is a large tectonic freshwater lake; Dal is a shallow urban lake famous for houseboats.
• Glacial lake vs lagoon — a glacial lake sits at high altitude behind ice or moraine; a lagoon lies at sea level behind a sand spit.
Also asked from this topic: the states the Teesta flows through, hit by the 2023 outburst flood (Sikkim and West Bengal); the state of the NDMA's GLOF early-warning pilot (Himachal Pradesh, 2026).
India - Population and Census · Current population estimates and projections

Q38. What is India's estimated population as of July 2025?

  1. (a) 1.36 billion
  2. (b) 1.46 billion
  3. (c) 1.56 billion
  4. (d) 1.76 billion
Answer & solution

Answer: (b) 1.46 billion

Answer: Option 2 — 1.46 billion
The UNFPA State of World Population 2025 report (June 2025) put India's population at about 1.46 billion (1,463.9 million), the largest in the world.
India overtook China (about 1.42 billion) as the most populous country in 2023.
Revision note — India's population: the key figures
• Census 2011: population 121.09 crore (1.21 billion); decadal growth 17.7 per cent (2001–11), down from 21.5 per cent; density 382 persons per sq km; sex ratio 943.
• UNFPA 2025 estimate: 1.46 billion; the report projects India's population to peak at about 1.7 billion in roughly 40 years before it starts to fall.
• India's total fertility rate has fallen below replacement level: 2.0 in NFHS-5 (2019–21) and about 1.9 in the UNFPA 2025 report, against the replacement level of 2.1.
• About 68 per cent of Indians are of working age (15–64) and about 26 per cent are aged 0–14 — the demographic dividend window.
• The next Census has been notified for 2027, reference date 1 March 2027 (snow-bound areas of Ladakh, J&K, Himachal and Uttarakhand on 1 October 2026).
• It will be India's first digital census and the first since 1931 to enumerate caste.
• World Population Day is observed on 11 July.
Do not mix these up
• Population estimate vs census count — 1.46 billion is a UN projection; the last counted figure remains 121.09 crore from Census 2011.
• Most populous vs most densely populated — India has the largest population, but by density it is far behind small countries such as Monaco; within India the densest state is Bihar.
Also asked from this topic: the population density of India in Census 2011 (382 per sq km); India's total fertility rate as per NFHS-5 (2.0); the only state with negative decadal growth in 2001–11 (Nagaland).
India - Population and Census · State and district rankings (census)

Q39. Which state contributes the largest share to India's incremental population growth (2025)?

  1. (a) Kerala
  2. (b) Tamil Nadu
  3. (c) Uttar Pradesh
  4. (d) Himachal Pradesh
Answer & solution

Answer: (c) Uttar Pradesh

Answer: Option 3 — Uttar Pradesh
Uttar Pradesh is India's most populous state, with about 24 crore people, roughly 17 per cent of the country.
Its fertility rate is still above replacement, so it adds more people every year than any other state.
Kerala, Tamil Nadu and Himachal Pradesh all have fertility below replacement level and add very little to the national total.
Revision note — Where India's population growth comes from
• Census 2011: Uttar Pradesh 19.98 crore (16.5 per cent of India), then Maharashtra 11.24 crore, Bihar 10.41 crore, West Bengal 9.13 crore.
• Total fertility rate, NFHS-5 (2019–21): India 2.0; Bihar 3.0 (highest), Uttar Pradesh 2.4, Kerala 1.8, Tamil Nadu 1.8, Himachal Pradesh 1.7; replacement level is 2.1.
• Most of India's future growth is projected to come from the northern "BIMARU" belt — Bihar, Madhya Pradesh, Rajasthan, Uttar Pradesh — plus Jharkhand and Chhattisgarh.
• The southern states (Kerala, Tamil Nadu, Andhra Pradesh, Karnataka, Telangana) reached replacement fertility years ago and are now ageing faster than the north.
• Decadal growth 2001–11: India 17.7 per cent; highest among states Meghalaya (27.9), the only negative Nagaland (−0.58).
• Kerala had the lowest decadal growth among the large states, 4.9 per cent.
• Population density, Census 2011: India 382 per sq km; Bihar 1,106 (highest state), Arunachal Pradesh 17 (lowest).
Do not mix these up
• Most populous state vs highest fertility state — the biggest population is Uttar Pradesh; the highest TFR is Bihar.
• Largest population vs highest density — Uttar Pradesh has the most people; Bihar packs the most people per square kilometre.
Also asked from this topic: the most populous state in Census 2011 (Uttar Pradesh); the second most populous state in Census 2011 (Maharashtra); Uttar Pradesh's share of India's population in 2011 (about 16 per cent).
India - Population and Census · Literacy rate

Q40. As of July 2025, India's literacy rate (estimated) is closest to which of the following?

  1. (a) 69%
  2. (b) 73%
  3. (c) 79%
  4. (d) 85%
Answer & solution

Answer: (c) 79%

Answer: Option 3 — 79%
The latest official estimate, from the Periodic Labour Force Survey (PLFS) 2023–24, puts India's literacy rate for persons aged 7 and above at 80.9 per cent.
Of the four options, 79% is the closest; the older Census 2011 figure of 74.04 per cent is the trap that leads to 73%.
Revision note — India's literacy rate: the figures to remember
• Census 1951: 18.33 per cent; Census 2001: 64.8 per cent; Census 2011: 74.04 per cent (males 82.14, females 65.46).
• NSO 78th round (2020–21): 77.7 per cent; PLFS 2023–24: 80.9 per cent (males about 87, females about 74).
• Census 2011 toppers: Kerala 94.0 per cent, then Mizoram 91.3, Goa 88.7; lowest Bihar 61.8 per cent.
• PLFS 2023–24 toppers: Mizoram 98.2 per cent, then Lakshadweep 97.3, Kerala 95.3; lowest Andhra Pradesh 72.6 and Bihar 74.3.
• Under the ULLAS (Nav Bharat Saaksharta Karyakram) scheme a state or UT with 95 per cent or more literacy counts as fully literate.
• Mizoram was declared the first fully literate state (May 2025), Goa the second (June 2025) and Tripura the third (August 2025); Ladakh was the first fully literate UT (June 2024).
• The Census counts a person aged 7 or above who can read and write with understanding in any language as literate.
• International Literacy Day is observed on 8 September (UNESCO, since 1966).
Do not mix these up
• Census 2011 rate vs current estimate — 74.04 per cent is the last census count; 80.9 per cent (PLFS 2023–24) is the working estimate for 2025.
• Kerala vs Mizoram — Kerala topped Census 2011; on the PLFS 2023–24 figures Mizoram is ahead and was the first state declared fully literate.
Also asked from this topic: India's literacy rate as per Census 2011 (74.04 per cent); the state with the highest literacy rate in Census 2011 (Kerala, 94.0 per cent); India's literacy rate in Census 1951 (18.33 per cent).

Ancient History (3)

Indus Valley Civilisation · Town planning and structures

Q41. Which civilization is called India's "first urbanization"?

  1. (a) Maurya
  2. (b) Indus Valley
  3. (c) Gupta
  4. (d) Vedic
Answer & solution

Answer: (b) Indus Valley

Answer: Option 2 — Indus Valley
The Harappan (Indus Valley) civilisation, mature between 2600 and 1900 BCE, built the subcontinent's first planned cities.
Grid streets, baked-brick houses, covered drains and granaries — that is why it is called the first urbanisation.
The second urbanisation came a thousand years later in the Ganga valley (6th century BCE) with the Mahajanapadas.
Revision note — The Indus Valley civilisation
• A Bronze Age culture of c. 3300–1300 BCE (mature phase 2600–1900 BCE).
• Harappa was excavated in 1921 by Daya Ram Sahni and Mohenjo-daro in 1922 by R. D. Banerji, under John Marshall of the ASI.
• Cities were laid out on a grid, divided into a raised citadel and a lower town, with standardised bricks in the ratio 1 : 2 : 4 and covered street drains.
• Landmarks: the Great Bath and Granary at Mohenjo-daro, the dockyard at Lothal, the reservoirs at Dholavira (UNESCO World Heritage, 2021), the ploughed field at Kalibangan.
• The largest Indian site is Rakhigarhi (Haryana); the largest overall is Mohenjo-daro (Sindh).
• The people used copper, bronze, gold and silver but did not know iron; the Indus script, written on steatite seals, remains undeciphered.
• Second urbanisation (c. 600 BCE): iron tools, Northern Black Polished Ware, coinage, and cities such as Rajagriha, Kaushambi, Ujjain and Shravasti.
Do not mix these up
• First vs second urbanisation — first = Harappan cities (Bronze Age, Indus basin); second = Mahajanapada cities (Iron Age, Ganga basin).
• Harappan vs Vedic — the Harappans were urban and iron-less; the Vedic people were rural and pastoral, and the later Vedic age knew iron.
Also asked from this topic: the Harappan site with a dockyard (Lothal); the metal unknown to the Harappans (iron); the site where the bronze Dancing Girl was found (Mohenjo-daro).
Vedic Period · Vedic literature (Vedas, Brahmanas, Aranyakas, Upanishads)

Q42. The Vedic period is mostly associated with:

  1. (a) Megalithic burials
  2. (b) Aryans and composition of the Vedas
  3. (c) Buddhist stupas
  4. (d) Roman trade
Answer & solution

Answer: (b) Aryans and composition of the Vedas

Answer: Option 2 — Aryans and composition of the Vedas
The Vedic age (c. 1500–600 BCE) takes its name from the four Vedas, composed by the Indo-Aryan speaking people who settled first in the Sapta Sindhu (Punjab) and later spread into the Ganga plain.
Megalithic burials belong to the South Indian Iron Age, stupas to the Mauryan and post-Mauryan age, and Roman trade to the Sangam age.
Revision note — The Vedic period
• Early (Rig) Vedic, 1500–1000 BCE: pastoral tribes in the Sapta Sindhu; wealth counted in cattle; tribal assemblies Sabha and Samiti; the king took a voluntary offering called Bali.
• Later Vedic, 1000–600 BCE: settled farming in the Ganga–Yamuna doab; iron (shyama or krishna ayas) appears; pottery is Painted Grey Ware; the varna system hardens.
• The Rigveda has 10 mandalas and 1,028 hymns; the Gayatri mantra (to Savitri) is in the 3rd mandala by Vishwamitra; the Purusha Sukta on the four varnas is in the 10th.
• Samaveda = melodies (the root of Indian music); Yajurveda = sacrificial formulas; Atharvaveda = charms and spells.
• Each Veda has Brahmanas (ritual), Aranyakas (forest books) and Upanishads (philosophy, 108 in number, also called Vedanta).
• The six Vedangas: Shiksha, Kalpa, Vyakarana, Nirukta, Chhanda, Jyotisha.
Do not mix these up
• Early vs Later Vedic — Rigvedic society was tribal, pastoral and iron-less; later Vedic society was territorial, agricultural and used iron.
• Vedic vs Harappan — the Harappans were city builders; the Vedic Aryans left no cities, only literature.
Also asked from this topic: the number of mandalas in the Rigveda (10); the region the early Vedic Aryans inhabited (Sapta Sindhu); the Veda that contains ritual formulas for sacrifices (Yajurveda).
Ancient Art, Culture and Science · Temple architecture styles (Nagara, Dravida, Vesara)

Q43. The Vesara style in temple architecture, seen at Aihole and Pattadakal, is a synthesis of:

  1. (a) Nagara (north) & Dravida (south)
  2. (b) Mughal & Portuguese
  3. (c) Rajput & Gothic
  4. (d) Gothic & Indo-Greek
Answer & solution

Answer: (a) Nagara (north) & Dravida (south)

Answer: Option 1 — Nagara (north) & Dravida (south)
Vesara is the hybrid temple style of the Deccan.
It takes the curvilinear shikhara of the northern Nagara style and the tiered vimana and pillared halls of the southern Dravida style.
It grew up under the Chalukyas of Badami at Aihole, Badami and Pattadakal in Karnataka.
Revision note — The three temple styles of India
• Nagara (north and central India): a curvilinear shikhara over the sanctum, crowned by a ribbed amalaka and a kalasha; no boundary wall or gateway.
• Nagara examples: Khajuraho, the Sun Temple, Konark and the Jagannath Temple, Puri (the Kalinga sub-style of Odisha).
• Dravida (Tamil country): a stepped pyramidal tower called the vimana over the sanctum, a walled compound and towering gateways called gopurams.
• Dravida examples: Brihadeeswara Temple, Thanjavur (Rajaraja Chola, 1010 CE) and the Meenakshi Temple, Madurai.
• Vesara (Deccan): a blend of the two, developed by the Chalukyas (6th–8th century) and carried on by the Rashtrakutas and the Hoysalas (Belur, Halebidu).
• Aihole is called the cradle of Indian temple architecture; its Durga Temple and Lad Khan Temple are early experiments.
• Pattadakal (UNESCO World Heritage Site, 1987) has Nagara and Dravida temples standing side by side.
• Its Virupaksha Temple was built by Queen Lokamahadevi to mark Vikramaditya II's victory over the Pallavas.
• The Chalukyas also cut the four Badami cave temples (three Hindu, one Jain) out of sandstone cliffs.
Do not mix these up
• Shikhara vs vimana — both are the tower over the sanctum, but the Nagara shikhara curves inward, while the Dravida vimana rises in straight stepped storeys.
• Vimana vs gopuram — in a Dravida temple the vimana is over the shrine; the gopuram is the gateway tower on the compound wall, often the taller of the two.
Also asked from this topic: the region where the Vesara style developed (Deccan); the main tower of a Dravida temple (vimana); the dynasty that built the Virupaksha Temple at Pattadakal (Chalukyas).

Medieval History (1)

Mughal Empire · Mughal architecture

Q44. The Taj Mahal's perfect symmetry and marble inlay (pietra dura) was inspired by which two art traditions?

  1. (a) Greek & Chinese
  2. (b) Persian & Indian
  3. (c) African & Byzantine
  4. (d) French & Japanese
Answer & solution

Answer: (b) Persian & Indian

Answer: Option 2 — Persian & Indian
The Taj Mahal is the high point of Indo-Islamic (Mughal) architecture.
That style fused the Persian-Timurid tradition of the bulbous dome, iwan and charbagh with Indian stone craft and decorative motifs.
Its pietra dura (parchin kari) inlay of semi-precious stones and its strict bilateral symmetry both come from this Persian-Indian blend.
Revision note — The Taj Mahal and Mughal architecture
• Built at Agra on the bank of the Yamuna by Shah Jahan in memory of Mumtaz Mahal; construction ran from about 1632 to 1653.
• The chief architect is recorded as Ustad Ahmad Lahori; the white marble came from Makrana in Rajasthan.
• Pietra dura is the inlay of cut precious and semi-precious stones into marble; the Mughals called it parchin kari.
• The technique was first used on a whole marble building at the Tomb of Itimad-ud-Daula (the Baby Taj, Agra, built 1622–1628 by Nur Jahan for her father Mirza Ghiyas Beg).
• Humayun's Tomb in Delhi (1572), the first garden-tomb of the subcontinent, gave the Taj its charbagh layout and double dome.
• The Taj Mahal was inscribed as a UNESCO World Heritage Site in 1983, in the first batch of Indian sites.
Do not mix these up
• Itimad-ud-Daula's Tomb vs Taj Mahal — the first is the earliest all-marble Mughal tomb with pietra dura; the Taj is its finest expression, thirty years later.
• Humayun's Tomb vs Taj Mahal — Humayun's Tomb is red sandstone with marble trim and is the model; the Taj is all white marble and the copy that surpassed it.
Also asked from this topic: the Mughal emperor who popularised pietra dura and the double dome (Shah Jahan); the year the Taj Mahal became a UNESCO World Heritage Site (1983); the tomb called the Baby Taj (Itimad-ud-Daula's Tomb, Agra).
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