West Bengal Police Constable Special Mock Test

Physics - Heat and Transfer

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

A) First Law

B) Second Law

C) Third Law

D) Zeroth Law

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

A) 0.6

B) 0.4

C) 0.2

D) 0.3

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

A) Molecules gain mass

B) Molecules form new bonds

C) Molecules lose kinetic energy

D) Molecules move to a higher energy state

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

A) Increase surface area

B) Increase thermal conductivity

C) Decrease surface area

D) Reduce weight

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

A) It increases

B) It depends on air temperature

C) It remains the same

D) It decreases

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

A) Altitude

B) Fuel type

C) Temperature difference between source and sink

D) Size of the plant

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8) 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) A heated metal rod cooling in air

C) An electric heater warming up a room

D) Ice melting in a cup of coffee

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

A) Density

B) Specific heat

C) Conductivity

D) Differential expansion

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

A) Heat absorbed or released during a phase change

B) Heat required to increase temperature without a phase change

C) Heat absorbed at constant volume

D) Heat absorbed in cyclic processes

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Curriculum

Physics (Heat and Transfer তাপ এবং স্থানান্তর)

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