Thermal Physics MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The heat energy required to convert a solid into a liquid without changing temperature is called:
A. Latent heat of fusion
B. Latent heat of vaporization
C. Specific heat
D. Thermal energy
Answer: Latent heat of fusion
Which law of thermodynamics states that heat cannot flow spontaneously from a colder body to a hotter body?
A. Second law of thermodynamics
B. First law of thermodynamics
C. Third law of thermodynamics
D. Zeroth law of thermodynamics
Answer: Second law of thermodynamics
The efficiency of a heat engine is given by the ratio of:
A. Work output to heat input
B. Heat input to work output
C. Heat rejected to work output
D. Work output to heat rejected
Answer: Work output to heat input
The temperature at which a substance changes from gas to liquid is called:
A. Condensation point
B. Boiling point
C. Freezing point
D. Melting point
Answer: Condensation point
The concept of ‘heat capacity’ is defined as:
A. The amount of heat required to raise the temperature of a substance by 1°C
B. The amount of heat required to change the phase of a substance
C. The rate at which heat is transferred through a material
D. The amount of heat released during a phase change
Answer: The amount of heat required to raise the temperature of a substance by 1°C
In an isothermal process, what remains constant?
A. Temperature
B. Pressure
C. Volume
D. Internal energy
Answer: Temperature
The process of a solid turning directly into a gas is called:
A. Sublimation
B. Deposition
C. Condensation
D. Freezing
Answer: Sublimation
Which of the following is a measure of the average kinetic energy of particles in a substance?
A. Temperature
B. Heat
C. Energy
D. Entropy
Answer: Temperature
Which of the following is NOT a thermodynamic variable?
A. Temperature
B. Pressure
C. Volume
D. Density
Answer: Density