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 change 1 kg of the substance to gas

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

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

A) Size of the plant

B) Altitude

C) Fuel type

D) Temperature difference between source and sink

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

A) Reduce weight

B) Decrease surface area

C) Increase surface area

D) Increase thermal conductivity

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

A) 0.4

B) 0.2

C) 0.3

D) 0.6

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

A) Specific heat

B) Differential expansion

C) Conductivity

D) Density

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

A) An electric heater warming up a room

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

C) Ice melting in a cup of coffee

D) A heated metal rod cooling in air

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

A) Molecules form new bonds

B) Molecules move to a higher energy state

C) Molecules lose kinetic energy

D) Molecules gain mass

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

A) It depends on air temperature

B) It increases

C) It remains the same

D) It decreases

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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 in cyclic processes

D) Heat absorbed at constant volume

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Curriculum

Physics (Heat and Transfer তাপ এবং স্থানান্তর)

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