Thermal Physics MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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Which of the following correctly defines thermal equilibrium?
A. Two objects in thermal contact no longer exchange heat
B. The temperature of two systems is zero
C. Heat is continuously exchanged between two bodies
D. Two objects have the same kinetic energy
Answer: Two objects in thermal contact no longer exchange heat
In which process does no heat enter or leave the system?
A. Isothermal process
B. Adiabatic process
C. Isobaric process
D. Isochoric process
Answer: Adiabatic process
The second law of thermodynamics states that:
A. Heat cannot spontaneously flow from a colder to a hotter body
B. Energy is conserved in an isolated system
C. The entropy of an isolated system decreases over time
D. No heat can be added to a system without work being done
Answer: Heat cannot spontaneously flow from a colder to a hotter body
What happens to the temperature of an ideal gas if the volume decreases and pressure remains constant?
A. It decreases
B. It increases
C. It remains constant
D. It becomes zero
Answer: It decreases
The specific heat capacity of a substance is defined as:
A. The amount of heat required to raise the temperature of a unit mass of the substance by 1°C
B. The heat required to change the phase of the substance
C. The heat transferred to a system without temperature change
D. The amount of heat per unit temperature change
Answer: The amount of heat required to raise the temperature of a unit mass of the substance by 1°C
What is the unit of heat in the International System (SI)?
A. Joule
B. Calorie
C. Watt
D. Kelvin
Answer: Joule
Which law states that the total energy of an isolated system remains constant?
A. First law of thermodynamics
B. Second law of thermodynamics
C. Law of conservation of mass
D. Third law of thermodynamics
Answer: First law of thermodynamics
The SI unit of work is:
A. Joule
B. Watt
C. Newton
D. Pascal
Answer: Joule
The energy stored in a compressed spring is an example of:
A. Elastic potential energy
B. Kinetic energy
C. Gravitational potential energy
D. Thermal energy
Answer: Elastic potential energy