Thermal Physics MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following devices is used to measure heat flow?
A. Calorimeter
B. Thermometer
C. Hygrometer
D. Barometer
Answer: Calorimeter
In a thermodynamic cycle, if work is done on the system, what happens to the internal energy?
A. It increases
B. It decreases
C. It remains constant
D. It becomes zero
Answer: It increases
Which of the following is NOT a method of heat transfer?
A. Radiation
B. Conduction
C. Convection
D. Absorption
Answer: Absorption
At absolute zero, the molecules of an ideal gas have:
A. No kinetic energy
B. Infinite energy
C. Constant velocity
D. Maximum potential energy
Answer: No kinetic energy
In an isothermal process, which of the following remains constant?
A. Temperature
B. Pressure
C. Volume
D. Internal energy
Answer: Temperature
Which law of thermodynamics implies that the entropy of an isolated system can never decrease?
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
What is the physical meaning of latent heat?
A. Heat required to change the state of a substance without changing its temperature
B. Heat absorbed by an object to raise its temperature
C. Heat transferred through radiation
D. Heat transferred during conduction
Answer: Heat required to change the state of a substance without changing its temperature
Which of the following is a unit of specific heat capacity?
A. J/kg·K
B. W/m·K
C. J/m²
D. Pa·m³
Answer: J/kg·K
Which gas law relates pressure and volume at constant temperature?
A. Boyle's law
B. Charles' law
C. Ideal gas law
D. Avogadro's law
Answer: Boyle's law