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RRB JE CBT-1 2025-26 19 February 2026 Shift 1 GK Questions – with answers & solutions

All 31 GK / GS questions asked in RRB JE CBT-1 2025-26 on 19 February 2026 Shift 1, with correct answers and short solutions, subject-wise: Biology, Physics, Chemistry, Economics.

📚 31 questions🗓️ 19 February 2026⏰ Shift 1
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Subjects: Biology (10) · Physics (11) · Chemistry (9) · Economics (1)

Biology (10)

Human Physiology - Respiration, Circulation and Excretion · Excretory system - kidney and nephron

Q1. Refer to the two statements given below and choose the CORRECT option.Statement A: Selective reabsorption in nephrons helps maintain water and salt balance in the body.Statement B: Selective reabsorption prevents nitrogenous wastes from entering the filtrate.

  1. (a) Statement A is correct but B is incorrect.
  2. (b) Both statements A and B are incorrect.
  3. (c) Both statements A and B are correct.
  4. (d) Statement A is incorrect but B is correct.
Answer & solution

Answer: (a) Statement A is correct but B is incorrect.

Statement A is correct: Selective reabsorption in nephrons helps the body maintain water and salt balance by reabsorbing useful substances back into the blood.
Statement B is incorrect: Selective reabsorption does not prevent nitrogenous wastes from entering the filtrate; instead, nitrogenous wastes remain in the filtrate to be excreted as urine.
Therefore, only Statement A is correct and Statement B is incorrect.
Final answer: Option 1
Cell - Structure and Function · Endoplasmic reticulum and ribosomes

Q2. Ribosomes are attached to the surface of the rough endoplasmic reticulum. What is the primary function of the rough endoplasmic reticulum?

  1. (a) Protein synthesis and transport
  2. (b) Energy production and cellular respiration
  3. (c) Lipid synthesis
  4. (d) DNA replication and transcription
Answer & solution

Answer: (a) Protein synthesis and transport

Ribosomes are attached to the rough endoplasmic reticulum (RER).
RER is primarily involved in protein synthesis.
These proteins are then transported to various parts of the cell.
Other options are incorrect as:
- Energy production is by mitochondria.
- Lipid synthesis is mainly by smooth ER.
- DNA replication and transcription occur in the nucleus.
Human Physiology - Respiration, Circulation and Excretion · Blood vessels, circulation and blood pressure

Q3. Systolic pressure is measured when the heart __________.

  1. (a) Contracts
  2. (b) Stops beating
  3. (c) Fills with blood
  4. (d) Relaxes
Answer & solution

Answer: (a) Contracts

Systolic pressure is the pressure exerted on the arteries when the heart contracts.
During this phase, the heart pumps blood into the arteries, increasing the pressure.
Hence, systolic pressure is measured when the heart contracts.
Option 1 is correct.
This completes the answer.
Biotechnology and Applied Biology · Apiculture and sericulture

Q4. Which bee variety is commonly known as the Indian bee and is used for commercial honey production?

  1. (a) Apis dorsata
  2. (b) Apis cerana indica
  3. (c) Apis florae
  4. (d) Apis mellifera
Answer & solution

Answer: (b) Apis cerana indica

The bee commonly known as the Indian bee is Apis cerana indica.
It is native to India and widely used for commercial honey production.
Apis dorsata, Apis florae, and Apis mellifera are other bee species but not referred to as the Indian bee typically used in India’s commercial honey industry.
Therefore, the correct answer is Apis cerana indica.
Cell - Structure and Function · Endoplasmic reticulum and ribosomes

Q5. Which cell organelle is responsible for the manufacture of lipids in the cell?

  1. (a) Smooth Endoplasmic Reticulum
  2. (b) Golgi Apparatus
  3. (c) Rough Endoplasmic Reticulum
  4. (d) Mitochondria
Answer & solution

Answer: (a) Smooth Endoplasmic Reticulum

The Smooth Endoplasmic Reticulum (Smooth ER) is responsible for lipid synthesis in cells.
Smooth ER lacks ribosomes, unlike Rough ER, which is involved in protein synthesis.
Hence, the organelle responsible for manufacturing lipids is the Smooth Endoplasmic Reticulum.
Final answer: Option 1
Nutrition and Digestion · Digestive enzymes and juices

Q6. Which enzyme initiates carbohydrate digestion in the human mouth?

  1. (a) Trypsin released by pancreas
  2. (b) Pepsin secreted by gastric glands
  3. (c) Lipase secreted by liver
  4. (d) Salivary amylase present in saliva
Answer & solution

Answer: (d) Salivary amylase present in saliva

The digestion of carbohydrates begins in the human mouth.
Salivary amylase, present in saliva, starts breaking down starch into maltose.
Other enzymes listed act on proteins or fats or act later in the digestive process.
Trypsin is a pancreatic enzyme acting on proteins in the small intestine.
Pepsin is secreted by gastric glands and digests proteins in the stomach.
Lipase, secreted by the liver, breaks down fats.
Hence, carbohydrate digestion is initiated by salivary amylase in the mouth.
Final answer: Option 4
Ecology and Environment · Waste management and biodegradable substances

Q7. Which statement is correct regarding the definition of biodegradable substances?

  1. (a) Substances that are broken by physical process
  2. (b) Substances that are broken by chemical process
  3. (c) Substances that are broken by biological process
  4. (d) Substances that are broken by mechanical process
Answer & solution

Answer: (c) Substances that are broken by biological process

Correct option is 3.
Biodegradable substances are those that can be broken down by biological processes involving microorganisms.
These substances decompose naturally by the action of bacteria, fungi or other living organisms.
Physical, chemical or mechanical processes do not define biodegradability.
Hence, option 3 is correct.
Answer ends.
Plant Physiology and Morphology · Transport in plants (xylem, phloem)

Q8. Which structural feature primarily enables upward movement of water against gravity in plants?

  1. (a) Lignified xylem vessels forming continuous columns
  2. (b) Thin-walled sieve tubes with companion cells
  3. (c) Large intercellular spaces in spongy mesophyll
  4. (d) Actively dividing meristematic tissues
Answer & solution

Answer: (a) Lignified xylem vessels forming continuous columns

Correct option: 1
Upward movement of water in plants occurs mainly through xylem vessels.
These vessels are lignified, giving them strength and preventing collapse under tension.
They form continuous columns from roots to leaves, aiding water transport against gravity.
This continuity and lignification help in creating capillary action and cohesion-tension, essential for water ascent.
Other options (sieve tubes, intercellular spaces, meristematic tissues) are not involved in primary water transport upwards.
Hence, lignified xylem vessels forming continuous columns enable upward water movement in plants.
This is the main structural feature responsible for water transport against gravity in plants.
Final answer: Option 1
Biotechnology and Applied Biology · Animal husbandry, poultry and fisheries

Q9. Why are cross-breeding programmes between indigenous and exotic poultry breeds undertaken?

  1. (a) To create hybrids with less attractive features
  2. (b) To increase only the egg size
  3. (c) To develop new varieties with desirable traits
  4. (d) To create hybrids showing similarity with their ancestors
Answer & solution

Answer: (c) To develop new varieties with desirable traits

Cross-breeding between indigenous and exotic poultry is done
to combine the best traits of both breeds.
The main goal is to develop new varieties with improved characteristics,
such as better growth rate, increased egg production, disease resistance, and adaptability.
Therefore, it helps in creating hybrids with desirable traits for better productivity.
Hence, the correct answer is Option 3.
Biotechnology and Applied Biology · Agricultural practices (manures, fertilisers, irrigation, weeding)

Q10. Why is using compost or vermi-compost preferable to excessive use of fertilizers for increasing soil fertility?

  1. (a) It replaces the need for irrigation and weeding.
  2. (b) It supplies only micro-nutrients and avoids macronutrients.
  3. (c) It recycles biological waste and avoids environmental harm.
  4. (d) It eliminates bacterial and viral plant diseases.
Answer & solution

Answer: (c) It recycles biological waste and avoids environmental harm.

Option 3 is correct.
Compost and vermi-compost recycle organic biological waste into valuable nutrients for the soil.
They improve soil structure and fertility without causing environmental pollution.
Excessive use of chemical fertilizers can harm soil health and environment.
Hence, compost is preferable to maintain sustainable soil fertility.
Answer ends here.

Physics (11)

Work, Energy and Power · Numericals on work, energy and power

Q11. A cricket ball of mass 0.15 kg is thrown horizontally at 30 m/s from the top of a building. What is the ball's kinetic energy as it leaves the hand?

  1. (a) 135 J
  2. (b) 90 J
  3. (c) 45.5 J
  4. (d) 67.5 J
Answer & solution

Answer: (d) 67.5 J

Mass of the cricket ball, m = 0.15 kg
Velocity, v = 30 m/s
Kinetic energy (KE) formula: KE =½m v²
Substitute given values: KE = 1/2 × 0.15 × (30)²
KE = 0.075 × 900 = 67.5 J
Therefore, kinetic energy as it leaves the hand is 67.5 joules.
Final answer: Option 4
Light - Refraction and Lenses · Convex lens - image formation and uses

Q12. A physicist uses a convex lens to focus sunlight onto a piece of paper and notices the smallest, brightest spot forms at a certain distance from the lens. Which property of the lens does this experiment help to determine?

  1. (a) The experiment helps to determine the focal length of the lens.
  2. (b) The experiment helps to determine the principal axis of the lens.
  3. (c) The experiment helps to determine the optical center of the lens.
  4. (d) The experiment helps to determine the diameter of the lens.
Answer & solution

Answer: (a) The experiment helps to determine the focal length of the lens.

The smallest and brightest spot formed by focusing sunlight is the focal point of the convex lens.
This spot appears at the focal length distance from the lens.
Hence, the experiment helps to determine the focal length of the lens.
Final answer: Option 1
Sources of Energy · Conventional sources and fossil fuels

Q13. Coal is primarily formed from:

  1. (a) Mineral deposits in the Earth
  2. (b) Remains of animals preserved in rocks
  3. (c) Layers of dead plants compressed over millions of years
  4. (d) Lava flows from volcanoes
Answer & solution

Answer: (c) Layers of dead plants compressed over millions of years

Solution:
•Coalis afossil fuelformed from theremains of ancient plants.
• Millions of years ago, large forests were buried undersoil and sediments, preventing complete decomposition.
• Over time,heat and pressureconverted these plant remains intocoalthrough a process calledcarbonisation.
• Therefore, coal is mainly formed fromlayers of dead plants compressed for millions of years.
Magnetism and Magnetic Effects of Current · Magnetic field due to current (Oersted, right-hand thumb rule)

Q14. How does the magnetic field strength at the center of a circular loop change if the current through the loop is doubled?

  1. (a) It becomes half as large
  2. (b) It becomes twice as large
  3. (c) It remains unchanged
  4. (d) It becomes four times as large
Answer & solution

Answer: (b) It becomes twice as large

Magnetic field strength (B) at the centre of a circular current loop is directly proportional to the current (I) flowing through it.
Formula: B ∝ I
If the current is doubled, the magnetic field strength also doubles.
Therefore, if current I becomes 2I, magnetic field B becomes 2B.
Hence, magnetic field strength becomes twice as large.
Final answer: Option 2
Light - Reflection and Mirrors · Convex mirror - image formation and uses

Q15. If a convex mirror forms a point-sized image at its focus, where is the object located?

  1. (a) At the pole
  2. (b) Between P and F
  3. (c) At infinity
  4. (d) Between F and the pole
Answer & solution

Answer: (c) At infinity

A convex mirror always forms a virtual, erect, and diminished image of an object.
The image formed by a convex mirror is always located behind the mirror, and at the focus only when the object is at infinity.
When the object is at infinity, the reflected rays appear to come from the focus, forming a point-sized image there.
Therefore, the object must be located at infinity to form a point-sized image at the focus of a convex mirror.
Final answer: Option 3
Light - Refraction and Lenses · Refractive index and optical density

Q16. If a material has an absolute refractive index of 1.7, what does this imply about the speed of light in that material compared to vacuum?

  1. (a) Light travels at the same speed in both.
  2. (b) Light travels 1.7 times faster in the material than in vacuum.
  3. (c) The speed difference cannot be determined from this value.
  4. (d) Light travels 1.7 times slower in the material than in vacuum.
Answer & solution

Answer: (d) Light travels 1.7 times slower in the material than in vacuum.

The absolute refractive index (n) is the ratio of speed of light in vacuum (c) to speed of light in the material (v).
n = c / v
Given n = 1.7, so light travels in the material slower than in vacuum.
Speed in material = c / 1.7, which means light is 1.7 times slower in the material than in vacuum.
Therefore, option 4 is correct.
Final answer: Option 4
Electricity · Resistance, resistivity and their factors

Q17. If an ammeter reading increases when a thicker wire replaces a thinner one of the same material and length, what is the most likely reason?

  1. (a) The voltage across the wire decreased
  2. (b) The resistance of the thicker wire is lower, allowing more current
  3. (c) The wire's length is shorter
  4. (d) The wire's resistivity increased
Answer & solution

Answer: (b) The resistance of the thicker wire is lower, allowing more current

Thicker wire has larger cross-sectional area.
Resistance R = ρL/A, where A increases means R decreases.
Lower resistance allows more current through the wire.
Ammeter reads current; increased current means lower resistance.
Hence, thicker wire causes lower resistance, resulting in increased current reading.
Final answer: Option 2
Human Eye and the Colourful World · Structure and parts of the human eye

Q18. What is the function of the iris in the human eye?

  1. (a) Controls the size of the pupil
  2. (b) Transmits signals to the brain
  3. (c) Refracts incoming light rays
  4. (d) Forms the image on the retina
Answer & solution

Answer: (a) Controls the size of the pupil

The iris is the coloured part of the eye.
It controls the size of the pupil by contracting or dilating.
This regulation adjusts the amount of light entering the eye.
Hence, the iris functions to control the pupil size, adapting to light conditions.
Option 1 is correct.
Answer complete.
Force and Laws of Motion · Newton's third law and its applications

Q19. When a gun is fired, it recoils backward as the bullet moves forward. How does this demonstrate Newton’s third law of motion?

  1. (a) The gun recoils because the bullet moves faster than the gun.
  2. (b) The bullet moves forward only because the gun has stored energy.
  3. (c) The gun pushes the bullet forward, and the bullet pushes the gun backward with an equal and opposite force.
  4. (d) The gun moves backward because it is heavier than the bullet.
Answer & solution

Answer: (c) The gun pushes the bullet forward, and the bullet pushes the gun backward with an equal and opposite force.

When a gun is fired, it exerts a force on the bullet, pushing it forward.
According to Newton’s third law, for every action, there is an equal and opposite reaction.
Thus, as the gun pushes the bullet forward, the bullet pushes the gun backward with equal force.
This backward movement of the gun is called recoil and directly demonstrates Newton’s third law of motion.
Hence, the forces between the gun and the bullet are equal in magnitude and opposite in direction.
Final answer: Option 3
Work, Energy and Power · Work and its sign

Q20. When a man pushes a wall but the wall does not move, what is the work done by the man on the wall?

  1. (a) Maximum work is done as the man uses full effort.
  2. (b) Zero work is done as there is no displacement of the wall.
  3. (c) Positive work is done as force is applied.
  4. (d) Negative work is done as the wall resists the push.
Answer & solution

Answer: (b) Zero work is done as there is no displacement of the wall.

Work done is defined as force applied multiplied by displacement in the direction of the force.
Here, the man applies force on the wall but the wall does not move.
Since displacement is zero, no work is done on the wall.
Therefore, work done by the man on the wall is zero.
Final answer: Option 2
Electricity · Heating effect of current and Joule's law

Q21. Why are bulbs filled with nitrogen and argon gases instead of air?

  1. (a) To prolong the life of the filament
  2. (b) To increase brightness
  3. (c) To make the bulb heavier
  4. (d) To reduce electricity consumption
Answer & solution

Answer: (a) To prolong the life of the filament

Bulbs are filled with nitrogen and argon gases to prevent the filament from oxidizing.
Air contains oxygen which would cause the filament to burn quickly.
Nitrogen and argon being inert gases do not react with the filament.
This helps to prolong the life of the filament inside the bulb.
Final answer: Option 1

Chemistry (9)

Atoms, Molecules and Mole Concept · Atomic mass and molecular mass

Q22. Atomic masses of elements are compared with a standard reference. Carbon-12 was chosen as the standard for the atomic mass unit mainly because:

  1. (a) Carbon is able to form a large number of compounds
  2. (b) Carbon-12 gives atomic masses close to whole numbers
  3. (c) Carbon shows very little chemical reactivity with elements
  4. (d) Carbon is present in very large amounts in nature
Answer & solution

Answer: (b) Carbon-12 gives atomic masses close to whole numbers

Correct option: 2
Carbon-12 is used as the standard for atomic mass units because its atomic mass is exactly 12 units.
This choice makes all atomic masses close to whole numbers, simplifying calculations and comparisons.
It is a defined standard agreed upon internationally.
Thus, Carbon-12 provides a precise and convenient reference point for atomic masses.
Answer complete.
Atoms, Molecules and Mole Concept · Ions and radicals

Q23. Sodium hydroxide (NaOH) contains __________ as its anion.

  1. (a) OH-
  2. (b) H+
  3. (c) Na+
  4. (d) NO₃⁻
Answer & solution

Answer: (a) OH-

Sodium hydroxide (NaOH) dissociates in water to give sodium ions (Na+) and hydroxide ions (OH-).
The anion present in NaOH is the hydroxide ion (OH-).
Other options: H+ is a cation, Na+ is a cation, NO₃⁻ is the nitrate ion, not part of NaOH.
Hence, the correct anion in sodium hydroxide is OH-.
Final answer: Option 1
Carbon and its Compounds · Chemical properties of carbon compounds (combustion, oxidation, addition, substitution)

Q24. When methane (CH₄) burns completely in the presence of sufficient oxygen, which products are formed?

  1. (a) Carbon dioxide and water
  2. (b) Carbon and hydrogen
  3. (c) Carbon monoxide and water
  4. (d) Carbon dioxide and carbon
Answer & solution

Answer: (a) Carbon dioxide and water

Methane (CH₄) burns in presence of sufficient oxygen producing carbon dioxide and water.
Complete combustion means all carbon forms CO₂ and hydrogen forms H₂O.
Reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.
Hence, the products are carbon dioxide and water.
Final answer: Option 1
Atoms, Molecules and Mole Concept · Laws of chemical combination

Q25. When two aqueous solutions react inside a sealed flask and form products, what happens to the total mass of the system?

  1. (a) It fluctuates during reaction
  2. (b) It increases due to gas formation
  3. (c) It decreases due to precipitation
  4. (d) It remains unchanged throughout
Answer & solution

Answer: (d) It remains unchanged throughout

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction.
In a sealed flask, no mass can enter or leave the system.
Therefore, the total mass of the reactants and products remains constant throughout the reaction.
Any physical changes like gas formation or precipitation do not alter the total mass inside the sealed container.
Hence, total mass remains unchanged during the reaction.
Final answer: Option 4
Mixtures, Solutions and Separation · Homogeneous and heterogeneous mixtures

Q26. Which of the following everyday examples represents a homogeneous mixture?

  1. (a) Chalk powder stirred in water
  2. (b) Oil mixed thoroughly with water
  3. (c) Sand mixed uniformly with iron filings
  4. (d) Salt completely dissolved in water
Answer & solution

Answer: (d) Salt completely dissolved in water

Option 4 is correct: Salt completely dissolved in water forms a homogeneous mixture.
In this mixture, salt particles are completely dissolved, making the solution uniform throughout.
Other options represent heterogeneous mixtures where components are visibly separate or not uniformly mixed.
Therefore, salt dissolved in water is the best example of a homogeneous mixture.
Final answer: Option 4
Metals and Non-metals · Metallurgy - extraction and refining

Q27. Which of the following metals is NOT refined by electrolytic refining?

  1. (a) sodium
  2. (b) copper
  3. (c) tin
  4. (d) zinc
Answer & solution

Answer: (a) sodium

Correct option: 1
Sodium is not refined by electrolytic refining.
Sodium is highly reactive and is usually refined by other methods like the Downs process.
Copper, tin, and zinc are commonly refined using electrolytic refining to achieve high purity.
Thus, sodium stands out as the metal not refined electrolytically.
Answer explained and clear.
Acids, Bases and Salts · Common salts - preparation and uses (baking soda, washing soda, bleaching powder, plaster of Paris)

Q28. Which of the following statements about washing soda is CORRECT?

  1. (a) Washing soda is chemically sodium carbonate decahydrate (Na2CO3·10H2O)
  2. (b) Washing soda is acidic in nature
  3. (c) It is obtained by heating sodium bicarbonate to 100°C
  4. (d) It does not remove permanent hardness of water
Answer & solution

Answer: (a) Washing soda is chemically sodium carbonate decahydrate (Na2CO3·10H2O)

Washing soda is sodium carbonate decahydrate with the chemical formula Na2CO3·10H2O.
It is a basic salt, so it is not acidic in nature (Option 2 is wrong).
Washing soda is obtained by heating sodium bicarbonate at about 200°C, not 100°C (Option 3 is wrong).
It is used to remove permanent hardness of water, so Option 4 is incorrect.
Therefore, the correct statement is Option 1.
Final answer: Option 1
Carbon and its Compounds · Chemical properties of carbon compounds (combustion, oxidation, addition, substitution)

Q29. Which statement best explains why unsaturated carbon compounds are generally more reactive than saturated carbon compounds?

  1. (a) Unsaturated compounds have fewer hydrogen atoms attached to carbon
  2. (b) Unsaturated compounds contain only single bonds between carbon atoms
  3. (c) Unsaturated compounds have double or triple bonds between carbon atoms
  4. (d) Unsaturated compounds form only straight carbon chains
Answer & solution

Answer: (c) Unsaturated compounds have double or triple bonds between carbon atoms

Unsaturated carbon compounds have double or triple bonds between carbon atoms.
These multiple bonds are areas of higher electron density and are more reactive than single bonds.
Saturated compounds contain only single bonds, making them less reactive.
Hence, the presence of double or triple bonds increases the reactivity of unsaturated compounds.
Final answer: Option 3
Structure of Atom · Atomic number and mass number

Q30. Which statement correctly describes the atomic number of an element?

  1. (a) Total mass of all subatomic particles
  2. (b) Total number of nucleons in the atom
  3. (c) Number of protons present in the nucleus
  4. (d) Number of neutrons present in the nucleus
Answer & solution

Answer: (c) Number of protons present in the nucleus

Solution:
• Theatomic numberof an element is thenumber of protons present in the nucleusof an atom.
• Itdetermines the identity of an elementand its position in theperiodic table.
• In aneutral atom, the number ofelectrons equals the atomic number.

Economics (1)

Agriculture and Food Security · Green Revolution and other agricultural revolutions

Q31. Sonora-64 and Lerma Rojo are high-yielding varieties (HYVs) of which crop introduced during the Green Revolution in India?

  1. (a) Maize
  2. (b) Rice
  3. (c) Wheat
  4. (d) Barley
Answer & solution

Answer: (c) Wheat

Solution:
Sonora-64andLerma Rojoarehigh-yielding varieties (HYVs) of wheat.
These varieties were introduced in India during theGreen Revolutionto increase wheat production.
Maize, rice, and barley had different HYVs, but these two specifically refer to wheat.
Answer:Wheat
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