West Bengal Police Constable Special Mock Test

Physics - Heat and Transfer

1 / 10

1) When a liquid boils, what happens at the molecular level?

A) Molecules move to a higher energy state

B) Molecules form new bonds

C) Molecules lose kinetic energy

D) Molecules gain mass

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2) Which law of thermodynamics implies the conservation of energy principle?

A) Second Law

B) Third Law

C) First Law

D) Zeroth Law

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3) What is the specific heat capacity of a substance?

A) The energy required to lower the temperature of 1 kg of the substance by 1 K

B) The energy required to change 1 kg of the substance to a solid

C) The energy required to raise the temperature of 1 kg of the substance by 1 K

D) The energy required to change 1 kg of the substance to gas

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4) What is the purpose of fins in a heat exchanger?

A) Reduce weight

B) Increase surface area

C) Increase thermal conductivity

D) Decrease surface area

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5) Which of the following scenarios best illustrates the concept of thermal equilibrium?

A) A thermometer reading the same temperature in a beaker of water as the surrounding air

B) An electric heater warming up a room

C) A heated metal rod cooling in air

D) Ice melting in a cup of coffee

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6) In a Carnot engine operating between temperatures of 500K and 300K, what is the efficiency of the engine?

A) 0.2

B) 0.3

C) 0.4

D) 0.6

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7) Which of the following best describes the concept of latent heat?

A) Heat required to increase temperature without a phase change

B) Heat absorbed in cyclic processes

C) Heat absorbed at constant volume

D) Heat absorbed or released during a phase change

8 / 10

8) A bimetallic strip is used in thermostats due to its property of:

A) Differential expansion

B) Specific heat

C) Density

D) Conductivity

9 / 10

9) What happens to the boiling point of water at high altitudes?

A) It remains the same

B) It decreases

C) It depends on air temperature

D) It increases

10 / 10

10) In a thermal power plant, the efficiency is affected primarily by:

A) Fuel type

B) Altitude

C) Size of the plant

D) Temperature difference between source and sink

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Curriculum

Physics (Heat and Transfer তাপ এবং স্থানান্তর)

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