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What is the value of the universal gas constant R in J/(mol·K)?
A. 8.314
B. 1.987
C. 0.0821
D. 22.414
Answer: 8.314
Which law of thermodynamics is associated with the concept of entropy?
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 term ‘thermal equilibrium’ refers to:
A. When two objects reach the same temperature
B. When the pressure of two gases is equal
C. When the volume of two gases is the same
D. When two substances have the same mass
Answer: When two objects reach the same temperature
In a thermodynamic cycle, the net work done is equal to:
A. The difference between heat absorbed and heat rejected
B. The total heat absorbed
C. The total heat rejected
D. The change in internal energy
Answer: The difference between heat absorbed and heat rejected
Which of the following processes is an example of an irreversible process?
A. Spontaneous mixing of gases
B. Reversible expansion of a gas
C. Reversible compression of a gas
D. Reversible phase change
Answer: Spontaneous mixing of gases
The process by which heat is transferred through electromagnetic waves is known as:
A. Radiation
B. Conduction
C. Convection
D. Absorption
Answer: Radiation
In which thermodynamic process is the volume of the gas kept constant?
A. Isochoric process
B. Isothermal process
C. Adiabatic process
D. Isobaric process
Answer: Isochoric process
What is the term for the energy required to raise the temperature of a unit mass of a substance by 1°C?
A. Specific heat capacity
B. Latent heat
C. Thermal capacity
D. Enthalpy
Answer: Specific heat capacity
Which principle states that no heat engine can be more efficient than a Carnot engine operating between the same temperatures?
A. Carnot principle
B. Kelvin principle
C. Zeroth law
D. Charles' law
Answer: Carnot principle