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Chemistry - MOST IMPORTANT CAPF Previous Year Questions

Practice real questions from previous year exams of CAPF.

📘 Phase Changing Processes and Their Factors📚 Misc

Q1

Latent heat corresponds to the change in heat at constant

🎯 UPSC CAPF 2020

A.

temperature only

B.

volume only

C.

pressure only

D.

temperature, volume and pressure

📘 Phase Changing Processes and Their Factors📚 Misc

Q2

Which one among the following statements about matter is NOT correct?

🎯 UPSC CAPF 2024

A.

On increasing the temperature of solids, the kinetic energy of particles increases

B.

The maximum temperature at which a solid melts to become a liquid at atmospheric pressure is called its melting point

C.

Particles of steam have more energy than water at 100°C

D.

Direct change of gas to solid is called deposition

📘 Phase Changing Processes and Their Factors📚 Melting

Q3

Water at 273 K is less effective in cooling than ice at the same temperature. It is because :

🎯 UPSC CAPF 2016

A.

water is difficult to handle

B.

water at 273 K has less energy than ice at the same temperature

C.

water at 273 K has more energy than ice at the same temperature

D.

water is not a cooling agent

📘 Phase Changing Processes and Their Factors📚 Boiling or Vaporization

Q4

Steam at 100°C is more effective in heating than water at the same temperature because

🎯 UPSC CAPF 2011

A.

steam is in the gaseous state and water is in the liquid state

B.

steam has an additional heat known as 'latent heat of vaporization'

C.

water has hydrogen bonds but steam does not

D.

transfer of heat from steam is easier than water

📘 Phase Changing Processes and Their Factors📚 Boiling or Vaporization

Q5

Lowering the atmospheric pressure on a liquid

🎯 UPSC CAPF 2018

A.

increases the boiling point of the liquid

B.

lowers the boiling point of the liquid

C.

does not affect the boiling point of the liquid

D.

increases the time required for it to boil

📘 Phase Changing Processes and Their Factors📚 Evaporation

Q6

How is the rate of transpiration affected by decreasing humidity and by decreasing light intensity?

🎯 UPSC CAPF 2017

A.

Decreases, Decreases

B.

Increases, Decreases

C.

Increases, Increases

D.

Decreases, Increases

📘 Phase Changing Processes and Their Factors📚 Evaporation

Q7

Which one of the following statements is not correct?

🎯 UPSC CAPF 2016

A.

The rate of evaporation depends on temperature

B.

The rate of evaporation does not depend on surface area exposed to the atmosphere but on volume of the liquid

C.

The rate of evaporation depends on humidity of the surroundings

D.

The rate of evaporation depends on the wind speed

📘 Phase Changing Processes and Their Factors📚 Evaporation

Q8

Relative humidity

🎯 UPSC CAPF 2011

A.

increases with increased temperature

B.

decreases with increased temperature

C.

decreases with decreased temperature

D.

has no relation with increase or decrease of temperature

📘 Chemical Reactions📚 Physical change

Q9

Which of the following are not chemical changes? 1. Tempering of iron 2. Conversion of iron piece into an electro-magnet by passing the current around the iron 3. Melting of iron 4. Rusting of iron. Select the correct answer using the code given below :

🎯 UPSC CAPF 2014

A.

1 and 2 only

B.

3 and 4 only

C.

1, 2 and 3

D.

1, 3 and 4

📘 Chemical Reactions📚 Physical change

Q10

Which one among the following statements is correct?

🎯 UPSC CAPF 2011

A.

Melting of ice and burning of candle represent the same kind of chemical change

B.

Melting of ice is a physical change and burning of candle is a chemical change

C.

Melting of ice is a chemical change and burning of candle is a physical change

D.

Melting of ice and burning of candle represent the same kind of physical change

📘 Phase Changing Processes and Their Factors📚 Sublimation

Q11

Which one among the following is a physical process?

🎯 UPSC CAPF 2010

A.

Digestion of food

B.

Corrosion or rusting of a metal

C.

Production of hydrogen from an acid

D.

Sublimation of iodine

📘 Water📚 Heavy Water

Q12

Statement I: Heavy water is used as moderator in nuclear reactor. Statement II: Thermal neutrons are used for fission reaction in a reactor.

🎯 UPSC CAPF 2010

A.

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

B.

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

C.

Statement I is true but Statement II is false

D.

Statement I is false but Statement II is true

📘 Chemical Reactions📚 Physical change

Q13

Statement I: Conversion of coal to diamond is a physical change. Statement II: Physical change does not change the composition of the material.

🎯 UPSC CAPF 2010

A.

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

B.

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

C.

Statement I is true but Statement II is false

D.

Statement I is false but Statement II is true

📘 Physical States of Matter and Their properties📚 Gas

Q14

If four balloons A, B, C and D are filled with hydrogen, oxygen, helium and nitrogen gases respectively and left in air, which balloon reaches to the highest distance from the Earth?

🎯 UPSC CAPF 2012

A.

Balloon A

B.

Balloon B

C.

Balloon C

D.

Balloon D

📘 Physical States of Matter and Their properties📚 Gas

Q15

Gases may be distinguished from other forms of matter by their :

🎯 UPSC CAPF 2010

A.

lack of colour.

B.

ability to flow.

C.

inability to form free surfaces.

D.

ability to exert a buoyant force.

📘 Physical States of Matter and Their properties📚 Gas

Q16

According to the principle of energy conservation, when a piston in an automobile engine compresses the gas in a cylinder, which of the following must occur?

🎯 UPSC CAPF 2014

A.

Kinetic energy of gas must increase

B.

The gas must undergo a change of state

C.

The gas must undergo a chemical change

D.

None of the above

📘 Corrosion📚 Rancidity

Q17

Packets of potato chips are usually flushed with which one of the following gases to prevent rancidity?

🎯 UPSC CAPF 2021

A.

Carbon dioxide

B.

Hydrogen

C.

Nitrogen

D.

Oxygen

📘 Phase Changing Processes and Their Factors📚 Sublimation

Q18

A change of state directly from solid to gas without changing into liquid state is called :

🎯 UPSC CAPF 2016

A.

Fusion

B.

Sublimation

C.

Diffusion

D.

Emulsion

📘 Solution📚 Solvent and Solute

Q19

Water is a good solvent for dissolving ionic compounds because

🎯 UPSC CAPF 2024

A.

It has a high specific heat

B.

It has no colour

C.

It has a high dipole moment

D.

It has a high boiling point

📘 Chemical Reactions📚 Endothermic Reaction

Q20

Which one among the following is an example of endothermic process ?

🎯 UPSC CAPF 2024

A.

Combustion of carbon

B.

Mixing acid and alkali

C.

Photosynthesis

D.

Respiration

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