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RRB JE CBT-1 2025-26 20 February 2026 Shift 2 GK Questions – with answers & solutions

All 29 GK / GS questions asked in RRB JE CBT-1 2025-26 on 20 February 2026 Shift 2, with correct answers and short solutions, subject-wise: Physics, Chemistry, Biology.

📚 29 questions🗓️ 20 February 2026⏰ Shift 2
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Subjects: Physics (10) · Chemistry (10) · Biology (9)

Physics (10)

Gravitation · Numericals on gravitation

Q1. A ball initially at rest is dropped from a height and takes 5 seconds to reach the ground. What is the average speed during its fall? (g = 10 m/s²)

  1. (a) 25 m/s
  2. (b) 50 m/s
  3. (c) 10 m/s
  4. (d) 20 m/s
Answer & solution

Answer: (a) 25 m/s

Initial velocity u = 0
Time t = 5 s, g = 10 m/s²
Distance fallen:
s = ½ × g × t²
= ½ × 10 × 25
= 125 m
Average speed =(total distance)/(total time)
= 125 / 5 =25 m/s
Motion · Numericals on motion

Q2. A cyclist increases her speed from 6 m/s to 12 m/s in 3 seconds on a straight road. What is her acceleration during this period?

  1. (a) 3 m/s²
  2. (b) 2 m/s²
  3. (c) 6 m/s²
  4. (d) 0.5 m/s²
Answer & solution

Answer: (b) 2 m/s²

Initial speed (u) = 6 m/s
Final speed (v) = 12 m/s
Time taken (t) = 3 seconds
Acceleration (a) =(v - u)/(t)
a =(12 - 6)/(3)
a =(6)/(3) = 2 m/s²
Re-check calculation: 6 to 12 in 3 seconds means speed doubles in 3 seconds; acceleration is (final speed − initial speed)/time
a =(12 - 6)/(3)= 2 m/s²
Correct option is 2 m/s²
Final answer: Option 1
Electricity · Numericals on electricity

Q3. A device operates at 2 amperes current and 220 volts potential difference for 5 hours. How much electrical energy does it consume, expressed in kilowatt hours (kWh)?

  1. (a) 1.1 kWh
  2. (b) 0.22 kWh
  3. (c) 5 kWh
  4. (d) 2.2 kWh
Answer & solution

Answer: (d) 2.2 kWh

Power (P) = Voltage (V) × Current (I)
P = 220 V × 2 A = 440 watts = 0.44 kW
Energy consumed (E) = Power × Time
E = 0.44 kW × 5 hours = 2.2 kWh
The device consumes 2.2 kilowatt hours of electrical energy.
Final answer: Option 4
Electricity · Heating effect of current and Joule's law

Q4. A room heater and an electric bulb both convert electrical energy to heat, but why does only the bulb emit significant visible light?

  1. (a) The heater is made of a different material
  2. (b) The bulb's filament reaches a higher temperature, emitting visible light
  3. (c) The heater uses magnetic effect instead of heating effect
  4. (d) The circuit design is different
Answer & solution

Answer: (b) The bulb's filament reaches a higher temperature, emitting visible light

A room heater and an electric bulb both convert electrical energy into heat, but only the bulb emits significant visible light.
This is because the filament in the bulb reaches a very high temperature.
At this high temperature, it emits visible light due to incandescence.
The heater element, although hot, operates at a lower temperature that mainly emits infrared radiation (heat) and not visible light.
Hence, the key difference is the filament temperature.
The bulb filament's higher temperature causes it to emit visible light efficiently, unlike the heater.
Final answer: Option 2
Light - Reflection and Mirrors · Convex mirror - image formation and uses

Q5. A security mirror in a store is required to provide a wide field of view and always form diminished, upright images regardless of the position of objects. Which type of mirror and principle should be used for its design?

  1. (a) Concave mirror using the mirror formula for real, inverted images
  2. (b) Concave mirror for magnification
  3. (c) Convex mirror using the mirror formula for virtual, diminished images
  4. (d) Plane mirror for undistorted images
Answer & solution

Answer: (c) Convex mirror using the mirror formula for virtual, diminished images

Option 3 is correct: Convex mirror using the mirror formula for virtual, diminished images.
Convex mirrors always form virtual, upright, and diminished images regardless of the object's position.
This property provides a wide field of view, making convex mirrors ideal for security purposes in stores.
Concave mirrors can form real, inverted images or magnified images but are not suitable here as the images need to be upright and diminished.
Plane mirrors produce images that are of the same size and not diminished, hence not suitable for wide field of view requirements.
Therefore, the design uses a convex mirror based on the mirror formula to get virtual, diminished images for better security coverage.
Final answer: Option 3
Work, Energy and Power · Potential energy

Q6. An object is placed on a shelf 2 m above the ground. If the shelf is raised to 4 m, what happens to the potential energy of the object?

  1. (a) The potential energy triples
  2. (b) The potential energy halves
  3. (c) The potential energy remains the same
  4. (d) The potential energy doubles
Answer & solution

Answer: (d) The potential energy doubles

Potential energy (PE) is given by the formula PE = mgh , where
m = mass of the object,
g = acceleration due to gravity,
h = height from the ground.
When height increases from 2 m to 4 m, height doubles.
Since PE is directly proportional to height, the potential energy also doubles.
Therefore, when the shelf is raised from 2 m to 4 m, potential energy doubles.
Final answer: Option 4
Electricity · Resistors in series and parallel

Q7. In a parallel combination of three resistors, which statement correctly describes the total current in the circuit?

  1. (a) It is the average of the currents through each resistor
  2. (b) It is equal to the sum of the currents through each resistor
  3. (c) It is the same as the current through each resistor
  4. (d) It is equal to the current through the resistor with the lowest resistance
Answer & solution

Answer: (b) It is equal to the sum of the currents through each resistor

In a parallel circuit, the total current is the sum of the currents through each resistor.
Each resistor provides a separate path for the current.
Therefore, the total current equals the sum of individual branch currents.
This follows the principle of parallel circuits in electricity.
Hence, the correct statement is that total current is the sum of currents through each resistor.
Final answer: Option 2
Magnetism and Magnetic Effects of Current · Domestic electric circuits, fuse and earthing

Q8. What role does the earth wire play in the safety of domestic appliances with metallic bodies?

  1. (a) It prevents the fuse from melting
  2. (b) It controls the current flow
  3. (c) It increases the appliance's voltage
  4. (d) It provides a low-resistance path for leakage current
Answer & solution

Answer: (d) It provides a low-resistance path for leakage current

The earth wire in domestic appliances is connected to the metallic body.
It provides a low-resistance path to the ground for any leakage current.
This prevents electric shock to the user if the live wire touches the metal body.
Hence, it enhances safety by directing leakage current safely to the earth.
So, the earth wire's main role is to provide a low-resistance path for leakage current.
Final answer: Option 4
Light - Refraction and Lenses · Laws of refraction and Snell's law

Q9. When a light ray enters a rectangular glass slab obliquely from air, what happens to its direction at the first interface?

  1. (a) It gets reflected back
  2. (b) It bends away from the normal
  3. (c) It travels straight
  4. (d) It bends towards the normal
Answer & solution

Answer: (d) It bends towards the normal

When light passes from a less dense medium (air) to a denser medium (glass), it slows down.
Due to this change in speed, it bends towards the normal at the interface.
Hence, the ray bends towards the normal when entering the glass slab obliquely from air.
Option 4 is correct.
Final answer: Option 4
Motion · Speed and velocity

Q10. Which of the following does NOT define the motion of a pendulum swinging back and forth?

  1. (a) The pendulum exhibits uniform motion
  2. (b) The pendulum exhibits periodic motion
  3. (c) The pendulum exhibits non-uniform motion
  4. (d) The pendulum exhibits accelerated motion
Answer & solution

Answer: (a) The pendulum exhibits uniform motion

The motion of a pendulum is not uniform because its speed varies during the swinging.
A pendulum swinging back and forth exhibits periodic motion, meaning it repeats at regular intervals.
The motion is non-uniform due to changing speed, so it exhibits non-uniform motion.
It also exhibits accelerated motion as acceleration changes direction during the swing.
Hence, the pendulum does NOT exhibit uniform motion.
Final answer: Option 1

Chemistry (10)

Carbon and its Compounds · Hydrocarbons - alkanes, alkenes, alkynes

Q11. A cyclic compound that contains only single bonds is classified as:

  1. (a) Aromatic
  2. (b) Unsaturated
  3. (c) Aliphatic
  4. (d) Saturated
Answer & solution

Answer: (d) Saturated

A cyclic compound with only single bonds means it has no double or triple bonds.
Such compounds are called saturated compounds because all carbon atoms are 'saturated' with hydrogen atoms.
Unsaturated compounds contain double or triple bonds, which is not the case here.
Aromatic compounds are cyclic but contain conjugated double bonds, not only single bonds.
Aliphatic compounds can be cyclic or acyclic but saturation refers specifically to bond types in the molecule.
Therefore, the correct classification is saturated compound.
Final answer: Option 4
Atoms, Molecules and Mole Concept · Laws of chemical combination

Q12. According to the law of constant proportions, the compound in which hydrogen and oxygen are present in a fixed mass ratio of 1:8 is:

  1. (a) Hydrogen peroxide
  2. (b) Water
  3. (c) Methane
  4. (d) Ammonia
Answer & solution

Answer: (b) Water

The law of constant proportions states that a chemical compound always contains the same elements in the exact same fixed ratio by mass.
Water (H2O) contains hydrogen and oxygen in a fixed mass ratio of 1:8.
Other compounds like hydrogen peroxide have different ratios.
Therefore, the compound with hydrogen and oxygen in a fixed mass ratio of 1:8 is water.
Hence, the correct answer is Option 2.
Chemical Reactions and Equations · Oxidation, reduction and redox reactions

Q13. In a redox reaction, what is the role of a 'reducing agent'?

  1. (a) It is a substance that only participates in decomposition reactions.
  2. (b) It is a catalyst that speeds up the reaction.
  3. (c) It is a substance that causes reduction and itself gets oxidized.
  4. (d) It is an agent that helps other substances to be oxidized.
Answer & solution

Answer: (c) It is a substance that causes reduction and itself gets oxidized.

The reducing agent is the substance that causes reduction in other substances.
It donates electrons to another species and itself loses electrons.
Losing electrons means the reducing agent itself gets oxidized.
Hence, a reducing agent is a substance that causes reduction and itself gets oxidized.
Correct option is 3.
Answer complete.
Chemical Bonding · Ionic bond

Q14. When magnesium reacts with oxygen to form magnesium oxide, which of the following statements is NOT correct?

  1. (a) The compound formed contains ionic bonds.
  2. (b) Magnesium loses electrons to form Mg3+ ions.
  3. (c) Oxygen gains electrons to form O2- ions.
  4. (d) Magnesium loses electrons to form Mg2+ ions.
Answer & solution

Answer: (b) Magnesium loses electrons to form Mg3+ ions.

Magnesium forms Mg2+ ions by losing two electrons, not Mg3+ ions.
The compound magnesium oxide contains ionic bonds.
Oxygen gains two electrons to form O2- ions.
Therefore, the incorrect statement is that magnesium forms Mg3+ ions.
Final answer: Option 2
Matter and its States · States of matter and their properties

Q15. Which of the following best supports the concept that matter is made-up of particles?

  1. (a) A drop of ink spreads uniformly in water
  2. (b) Water boils at 100°C
  3. (c) Ice melts to form water
  4. (d) Metals conduct electricity
Answer & solution

Answer: (a) A drop of ink spreads uniformly in water

Option 1 is correct: A drop of ink spreads uniformly in water.
This shows that matter is made up of tiny particles which move and mix with each other.
The spreading happens because the particles of ink and water move and mix at the microscopic level.
Other options describe physical properties but do not directly demonstrate the particle nature of matter.
Hence, the concept that matter is made of particles is best supported by the uniform spreading of ink in water.
Final answer: Option 1
Matter and its States · Diffusion

Q16. Which of the following will diffuse slowest in air?

  1. (a) Oxygen
  2. (b) Chlorine
  3. (c) Ammonia
  4. (d) Hydrogen
Answer & solution

Answer: (b) Chlorine

Diffusion rate is inversely proportional to the square root of molar mass (Graham's law).
Molar masses: Oxygen (32 g/mol), Chlorine (around 71 g/mol), Ammonia (17 g/mol), Hydrogen (2 g/mol).
Chlorine has the highest molar mass among these gases.
Therefore, chlorine diffuses slowest in air due to its greater molar mass.
Answer is Option 2.
Matter and its States · States of matter and their properties

Q17. Which property correctly distinguishes liquids from solids?

  1. (a) Liquids have fixed shape but no fixed volume
  2. (b) Liquids have fixed volume but no fixed shape
  3. (c) Liquids are completely incompressible in nature
  4. (d) Liquids cannot diffuse into other substances
Answer & solution

Answer: (b) Liquids have fixed volume but no fixed shape

Option 2 is correct.
Liquids have a fixed volume but no fixed shape.
This means they take the shape of the container they are in, unlike solids which have fixed shape and volume.
Liquids are not completely incompressible, and they can diffuse, so options 3 and 4 are incorrect.
Option 1 is also wrong because liquids don't have a fixed shape.
Hence, the key property that distinguishes liquids from solids is that liquids have fixed volume but no fixed shape.
Answer ends here.
Matter and its States · States of matter and their properties

Q18. Why do gases exert pressure on the walls of the container?

  1. (a) Gas particles attract the container walls strongly
  2. (b) Gas particles move randomly and strike the walls
  3. (c) Gas particles stay fixed inside the container
  4. (d) Gas particles possess very low kinetic energy
Answer & solution

Answer: (b) Gas particles move randomly and strike the walls

Correct Option: 2
Gases consist of particles moving randomly in all directions.
These particles collide with the walls of the container.
Each collision exerts a force on the wall.
The continuous collisions of gas particles cause pressure on the container walls.
Thus, gas pressure originates from particles striking the walls due to their random motion.
This explains why gases exert pressure on container walls.
Matter and its States · Evaporation and its factors

Q19. Why do wet clothes dry faster when spread out?

  1. (a) Clothes become hotter
  2. (b) Water escapes faster due to sunlight
  3. (c) Water boils off
  4. (d) Surface area is increased
Answer & solution

Answer: (d) Surface area is increased

Correct option is 4
Wet clothes dry because water evaporates from them.
When clothes are spread out, their surface area increases.
More surface area allows more water molecules to evaporate at the same time.
This speeds up the drying process.
Hence, wet clothes dry faster when spread out due to increased surface area.
This is a simple principle of evaporation rate and surface exposure.
Answer is option 4.
End of answer.
Chemical Reactions and Equations · Corrosion and rancidity

Q20. Why is nitrogen gas used to prevent oxidation in bags containing foods such as chips?

  1. (a) Nitrogen gas inhibits oxidation by replacing oxygen.
  2. (b) Nitrogen gas enhances the taste of the food.
  3. (c) Nitrogen gas accelerates oxidation.
  4. (d) Nitrogen gas makes chips crispier.
Answer & solution

Answer: (a) Nitrogen gas inhibits oxidation by replacing oxygen.

Nitrogen is an inert gas and does not react easily with other substances.
Oxidation occurs when oxygen reacts with the food, causing spoilage and rancidity.
By replacing oxygen with nitrogen, oxidation is prevented or slowed down.
This keeps the food, like chips, fresh and extends shelf life.
Hence, nitrogen gas inhibits oxidation by replacing oxygen inside the packaging.
Final answer: Option 1

Biology (9)

Human Physiology - Respiration, Circulation and Excretion · Blood - components and functions

Q21. A low platelet count may lead to __________.

  1. (a) Fever
  2. (b) Infection
  3. (c) Anemia
  4. (d) Excessive bleeding
Answer & solution

Answer: (d) Excessive bleeding

A low platelet count reduces blood clotting ability.
Platelets help in forming clots to stop bleeding.
When platelet count is low, bleeding may continue excessively.
Therefore, low platelet count leads to excessive bleeding.
Final answer: Option 4
Cell - Structure and Function · Plastids

Q22. Chloroplast is present in which of the following parts of a cell?

  1. (a) Cytoplasm
  2. (b) Peroxisome
  3. (c) Endoplasmic reticulum
  4. (d) Nucleoplasm
Answer & solution

Answer: (a) Cytoplasm

Chloroplast is an organelle where photosynthesis occurs.
It contains chlorophyll, giving plants their green colour .
Chloroplasts are found within the cytoplasm of plant cells.
They are not found in peroxisomes, endoplasmic reticulum, or nucleoplasm.
Hence, the correct location is the cytoplasm.
Final answer: Option 1
Diversity and Classification of Living Organisms · Characteristics of living organisms and life processes

Q23. Which combination best represents essential life processes for maintaining an individual organism?

  1. (a) Growth, movement, reproduction and response
  2. (b) Locomotion, feeding, communication and defence
  3. (c) Reproduction, variation, heredity and adaptation
  4. (d) Nutrition, respiration, transportation and excretion
Answer & solution

Answer: (d) Nutrition, respiration, transportation and excretion

The essential life processes for maintaining an individual organism include Nutrition, Respiration, Transportation, and Excretion.
These processes are fundamental to sustain life and ensure proper functioning of the organism.
Growth, movement, reproduction and response are important but not all are essential for maintaining the organism itself.
Reproduction, variation, heredity and adaptation relate more to species survival, not individual maintenance.
Hence, option 4 best represents essential life processes for maintaining an individual organism.
Final answer: Option 4
Biotechnology and Applied Biology · Agricultural practices (manures, fertilisers, irrigation, weeding)

Q24. Which of the following irrigation methods leads to the least wastage of water?

  1. (a) Sprinkler irrigation
  2. (b) Drip irrigation
  3. (c) Furrow irrigation
  4. (d) Flood irrigation
Answer & solution

Answer: (b) Drip irrigation

Option 2 is correct: Drip irrigation leads to the least wastage of water.
This method delivers water directly to the roots of plants in small quantities.
It reduces water loss due to evaporation and runoff.
Other methods like flood or furrow irrigation waste more water as they irrigate large areas indiscriminately.
Sprinkler irrigation is more efficient than flood but less than drip irrigation.
Hence, drip irrigation is the most water-efficient method among the given options.
Final answer: Option 2
Cell - Structure and Function · Golgi apparatus, lysosomes and vacuoles

Q25. Which of the following is an example of membrane bound little structures present in a cell?

  1. (a) Cytoplasm
  2. (b) Ribosome
  3. (c) Lysosome
  4. (d) Nucleoplasm
Answer & solution

Answer: (c) Lysosome

Correct option is 3: Lysosome.
Lysosomes are membrane-bound organelles containing digestive enzymes.
They help in breaking down waste materials and cellular debris.
Other options explanation:
1. Cytoplasm is the jelly-like substance in a cell, not membrane-bound.
2. Ribosomes are not membrane-bound; they are complexes of RNA and protein.
4. Nucleoplasm is the substance within the nucleus but not a separate organelle.
Thus, lysosome is the best example of a membrane-bound small structure in a cell.
Answer closed.
Cell - Structure and Function · Plant cell and animal cell

Q26. Which of the following is NOT correctly matched, with regard to plant and animal cells?

  1. (a) Plastids - Present in plant cells
  2. (b) Cell wall - Present in animal cells
  3. (c) Vacuoles - Very large and present in plant cells
  4. (d) Plastids - Absent in animal cells
Answer & solution

Answer: (b) Cell wall - Present in animal cells

Option 2 is incorrect because the cell wall is found in plant cells, not animal cells.
Animal cells do not have a cell wall; they only have a flexible cell membrane.
Plastids are present in plant cells and absent in animal cells, so options 1 and 4 are correct.
Vacuoles are very large in plant cells, serving as storage, which makes option 3 correct.
Therefore, cell wall present in animal cells is a wrong match.
Final answer: Option 2
Biotechnology and Applied Biology · Food production and storage

Q27. Which of the following statements is correct regarding the storage of grains?

  1. (a) Storage losses in agriculture produce can be very low.
  2. (b) Biotic factors responsible for losses in stored grains are insects, rodents and moisture.
  3. (c) Biotic factors responsible for losses in stored grains are insects, rodents and fungi.
  4. (d) Abiotic factors responsible for losses in stored grains are temperature, rodents and fungi.
Answer & solution

Answer: (c) Biotic factors responsible for losses in stored grains are insects, rodents and fungi.

Option 3 is correct.
Biotic factors causing losses in stored grains include insects, rodents, and fungi.
Moisture is an abiotic factor, not biotic.
Temperature is also an abiotic factor and does not fall under biotic.
Thus, the combination of insects, rodents and fungi correctly represents biotic factors causing losses in grains storage.
Therefore, Option 3 is the right answer.
Human Physiology - Respiration, Circulation and Excretion · Excretory system - kidney and nephron

Q28. Which statement best explains why blood cells are NOT found in the urine of a healthy person?

  1. (a) They are filtered and returned to the blood
  2. (b) They are broken down in the kidneys
  3. (c) They are reabsorbed in tubules
  4. (d) They are too large to pass through glomerular pores
Answer & solution

Answer: (d) They are too large to pass through glomerular pores

The glomerulus in kidneys filters the blood.
Only smaller molecules and water pass through the glomerular pores.
Blood cells are large in size and cannot pass through these pores.
Hence, blood cells do not appear in the urine of a healthy person.
Final answer: Option 4
Cell - Structure and Function · Prokaryotic and eukaryotic cells

Q29. Which statement is INCORRECT regarding prokaryotic organism?

  1. (a) Membrane-bound organelles are absent
  2. (b) Nuclear region is defined
  3. (c) Primitive form of organism
  4. (d) Single chromosome is present
Answer & solution

Answer: (b) Nuclear region is defined

Correct option: 2
Prokaryotic organisms do not have a defined nuclear membrane; their nuclear region is called the nucleoid and is not membrane-bound.
Other statements are correct: Membrane-bound organelles are absent in prokaryotes.
They are considered primitive forms of organisms compared to eukaryotes.
Most prokaryotes have a single circular chromosome.
Hence, option 2 is incorrect as nuclear region is not well defined.
Final answer: Option 2
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