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RRB JE CBT-1 2025-26 19 February 2026 Shift 3 GK Questions – with answers & solutions

All 30 GK / GS questions asked in RRB JE CBT-1 2025-26 on 19 February 2026 Shift 3, with correct answers and short solutions, subject-wise: Biology, Physics, Chemistry, Miscellaneous.

📚 30 questions🗓️ 19 February 2026⏰ Shift 3
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Subjects: Biology (10) · Physics (10) · Chemistry (9) · Miscellaneous (1)

Biology (10)

Biotechnology and Applied Biology · Animal husbandry, poultry and fisheries

Q1. Refer to the two statements given below and choose the CORRECT option.Statement A: Milch animals are reared primarily for the production of milk.Statement B: Milch animals are mainly used for ploughing agricultural fields.

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

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

Statement A is correct as milch animals are primarily reared for milk production.
Statement B is incorrect because milch animals are not mainly used for ploughing; draught animals like bullocks are used for that purpose.
Therefore, only Statement A is correct while Statement B is incorrect.
Final answer: Option 4
Biotechnology and Applied Biology · Food production and storage

Q2. Refer to the two statements given below and choose the CORRECT option.Statement A: Poor storage conditions result in weight loss and discolouration of grains.Statement B: Poor storage conditions enhance seed viability and grain texture.

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

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

Statement A is correct because poor storage conditions lead to moisture loss, resulting in weight loss and discolouration of grains.
Statement B is incorrect as poor storage conditions do not enhance seed viability or grain texture; they generally deteriorate these qualities.
Hence, only Statement A is correct and Statement B is incorrect.
Final answer: Option 1
Ecology and Environment · Waste management and biodegradable substances

Q3. Select the correct option regarding the following two statements labelled Assertion (A) and Reason (R).Assertion (A): Excess accumulation of biodegradable waste can also create environmental problems.Reason (R): Slow decomposition may lead to foul smell and spread of disease.

  1. (a) A is true, but R is false
  2. (b) A is false, but R is true
  3. (c) Both A and R are true, and R is the correct explanation of A
  4. (d) Both A and R are true, but R is not the correct explanation of A
Answer & solution

Answer: (c) Both A and R are true, and R is the correct explanation of A

Both Assertion (A) and Reason (R) are true.
Excess accumulation of biodegradable waste causes environmental problems like pollution and health hazards.
Slow decomposition of such waste leads to foul smell and spreads diseases.
Thus, Reason (R) correctly explains Assertion (A).
Final answer: Option 3
Cell - Structure and Function · Golgi apparatus, lysosomes and vacuoles

Q4. A large central vacuole is a characteristic feature of which of the following cells?

  1. (a) Bacterial cells
  2. (b) Animal cells
  3. (c) Protozoan cells
  4. (d) Plant cells
Answer & solution

Answer: (d) Plant cells

Correct option is 4.
A large central vacuole is a distinct characteristic of plant cells.
It stores water, nutrients and waste products.
This vacuole helps maintain turgor pressure in plant cells.
Other cells, like animal, bacterial, or protozoan cells typically do not have a large central vacuole.
Therefore, the feature is unique and diagnostic to plant cells.
Final answer: Option 4
Human Physiology - Respiration, Circulation and Excretion · Aerobic and anaerobic respiration

Q5. During aerobic respiration, each pyruvate molecule is broken down to give ______ molecules of carbon dioxide.

  1. (a) Four
  2. (b) One
  3. (c) Three
  4. (d) Two
Answer & solution

Answer: (c) Three

During aerobic respiration, each pyruvate molecule enters the mitochondria. It is further broken down in the Krebs cycle (Citric Acid cycle). In this process, one pyruvate molecule produces three molecules of carbon dioxide. Hence, 3 molecules of CO2 are produced from each pyruvate.
Cell - Structure and Function · Nucleus and chromosomes

Q6. The nucleus contains chromosomes, which appear as rod-shaped structures only when the cell is about to divide. These chromosomes are composed of _____.

  1. (a) Glucose and enzymes
  2. (b) RNA and lipids
  3. (c) Amino acids and carbohydrates
  4. (d) DNA and proteins
Answer & solution

Answer: (d) DNA and proteins

Chromosomes are structures found in the nucleus of a cell.
They are visible as rod-shaped bodies only during cell division.
Chromosomes are made up of DNA and proteins.
DNA carries genetic information.
Proteins, mainly histones, help package and organise the DNA.
Hence, the correct composition of chromosomes is DNA and proteins.
Final answer: Option 4
Biotechnology and Applied Biology · Animal husbandry, poultry and fisheries

Q7. What is the main purpose of giving vaccinations to farm animals?

  1. (a) To protect them from major viral and bacterial diseases
  2. (b) To increase milk production
  3. (c) To prevent attacks from external parasites
  4. (d) To improve the quality of animal feed
Answer & solution

Answer: (a) To protect them from major viral and bacterial diseases

Correct option is 1.
Vaccinations are given to farm animals to protect them from major viral and bacterial diseases.
This helps in preventing disease outbreaks and maintaining animal health.
Options 2, 3, and 4 do not represent the primary purpose of vaccination.
Hence, the main goal is disease prevention through immunity building.
This ensures better productivity and reduces mortality in farm animals.
Final answer: Option 1
Biotechnology and Applied Biology · Food production and storage

Q8. Which crop should a farmer consider for cultivation if he wants to increase protein content in his harvest?

  1. (a) Vegetables and spices
  2. (b) Pulses
  3. (c) Cereals
  4. (d) Oilseeds
Answer & solution

Answer: (b) Pulses

Correct option: 2
Pulses are rich in protein compared to cereals, oilseeds, and vegetables.
Farmers aiming to increase protein content should choose pulses for cultivation.
Pulses include lentils, beans, chickpeas, etc., known for high protein.
Hence, selecting pulses enhances protein yield in harvest.
This is the direct answer to the question.
Ecology and Environment · Trophic levels and the 10 percent law

Q9. Why are terrestrial food chains usually limited to 4–5 trophic levels?

  1. (a) Plants produce less oxygen
  2. (b) Energy available decreases at higher trophic levels
  3. (c) Top predators eat less
  4. (d) Decomposers recycle all energy
Answer & solution

Answer: (b) Energy available decreases at higher trophic levels

The main reason terrestrial food chains have only 4–5 trophic levels is energy loss.
Energy decreases at each trophic level due to heat loss, respiration, and other metabolic activities.
Less energy is available to support organisms at higher levels, limiting chain length.
Therefore, longer chains cannot be supported because energy availability becomes too low.
Hence, energy available decreases at higher trophic levels is the correct reason.
Final answer: Option 2
Human Physiology - Respiration, Circulation and Excretion · Aerobic and anaerobic respiration

Q10. Why do muscle cells sometimes respire anaerobically during heavy exercise?

  1. (a) Because the supply of oxygen is limited
  2. (b) Because the body wants to store energy
  3. (c) Because lactic acid is required
  4. (d) Because glucose is unavailable
Answer & solution

Answer: (a) Because the supply of oxygen is limited

During heavy exercise, muscle cells require more energy rapidly.
Oxygen supply becomes limited as breathing and blood flow can't keep up.
Muscle cells start anaerobic respiration to produce energy without oxygen.
This allows continued ATP production but results in lactic acid formation.
Hence, anaerobic respiration happens because oxygen supply is limited.
Final answer: Option 1

Physics (10)

Gravitation · Numericals on gravitation

Q11. A ball at rest is dropped from the top of a 20 m high building. Calculate the speed with which it hits the ground. (Take g = 10 m/s²)

  1. (a) 40 m/s
  2. (b) 14 m/s
  3. (c) 10 m/s
  4. (d) 20 m/s
Answer & solution

Answer: (d) 20 m/s

The ball is dropped from rest, so initial velocity u = 0 m/s.
Height h = 20 m, acceleration due to gravity g = 10 m/s².
Use the formula v² = u² + 2gh to find the final speed v.
v² = 0 + 2 × 10 × 20 = 400.
v = √400 = 20 m/s.
The speed with which it hits the ground is 20 m/s.
Correct option is Option 4.
Hence, final answer: Option 4
Work, Energy and Power · Conservation and transformation of energy

Q12. A ball is placed at the edge of a table and left undisturbed. Which form of energy does the ball primarily possess due to its position, and what can happen if it is pushed off the table?

  1. (a) The ball possesses chemical energy and will release it when it falls.
  2. (b) The ball possesses kinetic energy and will remain at rest unless a force acts on it.
  3. (c) The ball possesses potential energy and will convert it to kinetic energy as it falls.
  4. (d) The ball possesses elastic potential energy due to its shape.
Answer & solution

Answer: (c) The ball possesses potential energy and will convert it to kinetic energy as it falls.

The ball placed at the edge of the table is at a height from the ground.
Due to its position, it possesses gravitational potential energy.
When the ball is pushed off the table, this potential energy converts into kinetic energy as it falls.
Hence, the correct energy form is potential energy, which becomes kinetic energy upon the fall.
Final answer: Option 3
Light - Refraction and Lenses · Convex lens - image formation and uses

Q13. A bi-convex lens forms a real, inverted image twice as large as the object. Where is the object located relative to the lens?

  1. (a) At twice the focal length from the lens
  2. (b) Beyond twice the focal length from the lens
  3. (c) Between one focal length and twice the focal length from the lens
  4. (d) At the focal length from the lens
Answer & solution

Answer: (c) Between one focal length and twice the focal length from the lens

Solution:
Abi-convex lens (convex lens)forms areal and inverted imagewhen the object is placedbeyond the focal length.
If theimage is twice the size of the object, themagnification |m| = 2.
For a convex lens, this happens when theobject lies between the focal length (F) and twice the focal length (2F).
In this position, theimage forms beyond 2F, real, inverted, and magnified.
Answer: Between one focal length and twice the focal length from the lens
Motion · Speed and velocity

Q14. A car travels 120 meters north in 10 seconds and then instantly returns to its original position in the next 10 seconds. Which statement best describes the car's average velocity for the entire trip?

  1. (a) The average velocity is 12 m/s because the car covered 120 m in 10 seconds.
  2. (b) The average velocity is 12 m/s because the total time is 10 seconds.
  3. (c) The average velocity is 6 m/s because the total distance is 240 m in 20 seconds.
  4. (d) The average velocity is zero because the displacement is zero.
Answer & solution

Answer: (d) The average velocity is zero because the displacement is zero.

The car goes120 m northand thenreturns 120 m southto the starting point.
So thetotal displacement = 0 m.
Average velocity =(Total displacement)/(Total time).
Since displacement iszero, theaverage velocity = 0 m/s.
Answer: 0 m/s
Human Eye and the Colourful World · Prism and dispersion of light

Q15. A scientist wants to demonstrate that dispersion depends on wavelength. She shines monochromatic red light through a prism. What does she observe and why?

  1. (a) Red light is absorbed, so nothing emerges
  2. (b) Only a single red ray emerges; no spectrum forms because there is only one wavelength
  3. (c) A full spectrum appears, showing all colors
  4. (d) Multiple red rays emerge, each at a different angle
Answer & solution

Answer: (b) Only a single red ray emerges; no spectrum forms because there is only one wavelength

Correct option: 2
Dispersion occurs when white light splits into multiple colours due to different wavelengths refracting differently.
Monochromatic light, like red light, has only one wavelength.
When red light passes through a prism, it refracts but does not split into a spectrum.
Thus, only a single red ray emerges, without forming a spectrum.
This shows dispersion depends on multiple wavelengths, which are absent here.
Hence, the scientist observes a single red ray emerging from the prism without a spectrum.
Answer complete.
Magnetism and Magnetic Effects of Current · Magnetic field due to current (Oersted, right-hand thumb rule)

Q16. A student observes that a compass needle deflects when brought near a current-carrying wire. Using your understanding of magnetic fields, explain why this happens.

  1. (a) A current-carrying wire creates a magnetic field that exerts a force on the compass needle.
  2. (b) The wire produces an electric force that acts on the compass needle.
  3. (c) The wire heats up, causing air currents to move the needle.
  4. (d) The wire causes a gravitational effect moving the needle.
Answer & solution

Answer: (a) A current-carrying wire creates a magnetic field that exerts a force on the compass needle.

A current flowing through a wire generates a magnetic field around it.
The compass needle aligns itself with the surrounding magnetic field.
When the wire is near the compass, the magnetic field from the wire influences the needle.
This causes the needle to deflect from Earth's magnetic field direction and point according to the wire's field.
Hence, the deflection is due to the magnetic field created by the current in the wire.
Final answer: Option 1
Electricity · Heating effect of current and Joule's law

Q17. An electric iron uses a heating element made of an alloy instead of pure metal. Which property of alloys justifies this choice?

  1. (a) Alloys have lower resistivity
  2. (b) Alloys have higher resistivity and do not oxidise readily at high temperatures
  3. (c) Alloys are better conductors
  4. (d) Alloys are cheaper
Answer & solution

Answer: (b) Alloys have higher resistivity and do not oxidise readily at high temperatures

The heating element in an electric iron requires a material that can withstand high temperatures without oxidising.
Alloys have higher resistivity, which helps the element heat up efficiently.
They do not oxidise readily at high temperatures, ensuring durability and safety.
Pure metals may oxidise and degrade faster under heat, making alloys preferable for heating elements.
Therefore, alloys are chosen for heating elements because of higher resistivity and resistance to oxidation at high temperatures.
Final answer: Option 2
Light - Refraction and Lenses · Laws of refraction and Snell's law

Q18. What does Snell's law of refraction state about the ratio of the sine of the angle of incidence to the sine of the angle of refraction for a given colour and pair of media?

  1. (a) It depends on the type of mirror.
  2. (b) It varies with the normal.
  3. (c) It changes with the angle of incidence.
  4. (d) It remains constant.
Answer & solution

Answer: (d) It remains constant.

Snell's law states that for a given colour and pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant.
This constant is called the refractive index of the second medium with respect to the first medium.
Therefore, the ratio does not depend on the angle of incidence or normal but remains constant for a specific colour and media pair.
Hence, the correct option is that it remains constant.
Final answer: Option 4
Light - Reflection and Mirrors · Spherical mirror terminology

Q19. Which type of spherical mirror has its reflecting surface curved inwards, facing towards the centre of the sphere?

  1. (a) Plane mirror
  2. (b) Parabolic mirror
  3. (c) Convex mirror
  4. (d) Concave mirror
Answer & solution

Answer: (d) Concave mirror

Correct option: 4
A spherical mirror where the reflecting surface curves inwards, towards the centre of the sphere, is called a concave mirror.
Concave mirrors converge light rays to a focal point.
This inward curvature distinguishes it from convex mirrors, whose reflecting surface bulges outwards.
Hence, the mirror described is a concave mirror.
Final answer: Option 4
Heat and Thermodynamics · Latent heat and change of state

Q20. Why does the temperature remain constant during melting of ice even on heating?

  1. (a) Heat energy increases kinetic energy instantly
  2. (b) Heat energy escapes from ice into the surroundings
  3. (c) Heat energy converts directly into work
  4. (d) Heat energy is used to overcome particle attraction
Answer & solution

Answer: (d) Heat energy is used to overcome particle attraction

During melting, temperature remains stable because all heat energy supplied is used to break the forces of attraction between particles in ice.
This energy required to break these forces is called latent heat of fusion.
Hence, temperature does not increase until the entire ice melts.
Therefore, heat energy is used to overcome particle attraction during melting.
Final answer: Option 4

Chemistry (9)

Chemical Reactions and Equations · Corrosion and rancidity

Q21. A bright metal turns dull over time due to oxidation. What is this process called?

  1. (a) Corrosion
  2. (b) Filtration
  3. (c) Evaporation
  4. (d) Sublimation
Answer & solution

Answer: (a) Corrosion

Option 1 is correct.
The process in which a bright metal turns dull due to oxidation is called corrosion.
Corrosion is the gradual destruction of metals by chemical reactions with their environment, mainly oxygen.
Hence, the correct term for this process is corrosion.
Answer complete.
Acids, Bases and Salts · Common salts - preparation and uses (baking soda, washing soda, bleaching powder, plaster of Paris)

Q22. Baking soda (NaHCO₃) is commonly used in cooking. Which of the following statements about it is correct?

  1. (a) It is acidic in nature and has pH < 7.
  2. (b) It reacts with acids to release carbon dioxide gas.
  3. (c) It does not react with water or acids.
  4. (d) It is a strong base that turns red litmus blue.
Answer & solution

Answer: (b) It reacts with acids to release carbon dioxide gas.

Option 2 is correct.
Baking soda (NaHCO₃) is a mild base, not acidic, so option 1 is wrong.
It reacts with acids releasing carbon dioxide gas, which is why it is used in cooking to leaven dough.
Option 3 is incorrect as it does react, especially with acids.
Option 4 is also incorrect because it is a mild base, not a strong base, and does not strongly turn red litmus to blue.
Hence, the correct statement is that baking soda reacts with acids to release CO2 gas.
Final answer: Option 2
Carbon and its Compounds · Chemical properties of carbon compounds (combustion, oxidation, addition, substitution)

Q23. Compare the products of complete and incomplete combustion of methane:

  1. (a) Complete → CO + H₂O; Incomplete → CO₂ + H₂O
  2. (b) Complete → CO₂ only; Incomplete → H₂O only
  3. (c) Complete → CO₂ + H₂O; Incomplete → CO + H₂O
  4. (d) Complete → CO + H₂O; Incomplete → C + H₂O
Answer & solution

Answer: (c) Complete → CO₂ + H₂O; Incomplete → CO + H₂O

Complete combustion of methane produces carbon dioxide (CO₂) and water (H₂O).
Incomplete combustion of methane produces carbon monoxide (CO) and water (H₂O) due to insufficient oxygen.
Hence, the products are:
Complete → CO₂ + H₂O
Incomplete → CO + H₂O
Final answer: Option 3
Metals and Non-metals · Corrosion and its prevention (galvanisation, etc.)

Q24. Iron nails are coated with zinc to prevent rusting. Even if the zinc layer is scratched, rusting does not occur because —

  1. (a) Zinc forms a hard oxide layer.
  2. (b) Iron becomes stainless in the presence of zinc.
  3. (c) Zinc reacts with moisture to form a protective film
  4. (d) Zinc acts as a sacrificial anode and corrodes instead of iron.
Answer & solution

Answer: (d) Zinc acts as a sacrificial anode and corrodes instead of iron.

Correct option: 4
Zinc coating on iron nails prevents rusting by acting as a sacrificial anode.
When the zinc layer is scratched, zinc corrodes preferentially instead of iron.
This sacrificial corrosion protects the iron beneath from rusting.
Hence, even if zinc coating is damaged, iron remains protected from rust.
Answer is option 4.
Matter and its States · States of matter and their properties

Q25. Which measurable quantity remains the same when a liquid is transferred between containers?

  1. (a) Mass of the liquid becomes zero
  2. (b) Density of the liquid always increases
  3. (c) Volume of the liquid remains unchanged
  4. (d) Shape of the liquid remains unchanged
Answer & solution

Answer: (c) Volume of the liquid remains unchanged

The volume of a liquid is a measure of the space it occupies.
When transferring a liquid from one container to another, no liquid is lost, so its volume remains the same.
Mass may remain same but does not become zero; density can change with temperature; shape changes according to container.
Hence, the measurable quantity that remains unchanged is the volume of the liquid.
Final answer: Option 3
Metals and Non-metals · Reactivity series

Q26. Which metal releases the most heat when reacting with excess hydrochloric acid?

  1. (a) Magnesium
  2. (b) Iron
  3. (c) Zinc
  4. (d) Nickel
Answer & solution

Answer: (a) Magnesium

Magnesium releases the most heat when reacting with excess hydrochloric acid.
This is because magnesium is more reactive compared to iron, zinc, and nickel.
Greater reactivity means a more vigorous and exothermic reaction with HCl.
Hence, magnesium produces the maximum heat among the given metals.
Final answer: Option 1
Carbon and its Compounds · Hydrocarbons - alkanes, alkenes, alkynes

Q27. Which of the following is the correct relationship between the number of carbon and hydrogen atoms in alkenes?

  1. (a) CnH2n+4
  2. (b) CnH2n+2
  3. (c) CnH2n
  4. (d) CnH2n-2
Answer & solution

Answer: (c) CnH2n

Alkenes are hydrocarbons with at least one carbon-carbon double bond.
The general formula for alkenes is CnH2n, where n is the number of carbon atoms.
This formula indicates there are twice as many hydrogen atoms as carbon atoms.
Hence, the correct relation is CnH2n.
Final answer: Option 3
Metals and Non-metals · Metallurgy - extraction and refining

Q28. Which process is used to convert zinc carbonate ore into zinc oxide before reduction?

  1. (a) Heating with aluminium powder
  2. (b) Heating with carbon powder
  3. (c) Heating strongly in limited air
  4. (d) Heating strongly in excess air
Answer & solution

Answer: (c) Heating strongly in limited air

Zinc carbonate is converted to zinc oxide by heating.
This process is called roasting.
Roasting means heating strongly in limited air.
Hence, option 3 is correct.
Final answer: Option 3
Metals and Non-metals · Metallurgy - extraction and refining

Q29. Why is mercury obtained from cinnabar ore through two heating steps instead of direct reduction?

  1. (a) Mercury sulphide must first change into oxide
  2. (b) Mercury sulphide melts before decomposition
  3. (c) Mercury metal reacts with oxygen on heating
  4. (d) Mercury oxide forms only in absence of air
Answer & solution

Answer: (a) Mercury sulphide must first change into oxide

Mercury is obtained from cinnabar ore (mercury sulphide, HgS) by heating in presence of air.
First, mercury sulphide is converted to mercury oxide (HgO) by partial oxidation.
This step is necessary because direct reduction is not efficient.
Then, mercury oxide decomposes to mercury metal and oxygen upon further heating.
Hence, the two-step heating helps in converting HgS to HgO first, and then to metallic mercury.
So, mercury sulphide must first change into oxide before mercury is obtained.
Final answer: Option 1

Miscellaneous (1)

General Miscellaneous · Non-GK items (reasoning or maths) - keep out of GK mocks

Q30. In what ratio must a fruit vendor mix two varieties of mangoes costing ₹60/kg and ₹68.40/kg, so that by selling the mixed variety of mangoes at ₹79.80/kg, he may gain 18.75%?

  1. (a) 7 : 3
  2. (b) 3 : 7
  3. (c) 1 : 6
  4. (d) 6 : 1
Answer & solution

Answer: (c) 1 : 6

Let the two varieties cost₹60/kgand₹68.40/kg.
Required SP for 18.75% gain:
CP_(mix)=(SP)/(1+Gain)=(79.80)/(1+3/16)=(79.80)/(19/16)=67.20
Alligation:
Variety Difference from CP_(mix)6067.20-60=7.2068.4068.40-67.20=1.20
Mixing Ratio=1.20:7.20=1:6
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