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In a heat engine, the ratio of work done to heat absorbed is known as:
A. Efficiency
B. Entropy
C. Enthalpy
D. Specific heat
Answer: Efficiency
The principle of ‘conservation of energy’ is associated with which law of thermodynamics?
A. First law of thermodynamics
B. Second law of thermodynamics
C. Third law of thermodynamics
D. Zeroth law of thermodynamics
Answer: First law of thermodynamics
The second law of thermodynamics introduces the concept of:
A. Entropy
B. Enthalpy
C. Specific heat
D. Temperature
Answer: Entropy
What is the term for the heat energy required to change a solid into a liquid?
A. Latent heat of fusion
B. Latent heat of vaporization
C. Specific heat
D. Thermal energy
Answer: Latent heat of fusion
Which type of heat transfer occurs in a vacuum?
A. Radiation
B. Conduction
C. Convection
D. Conduction and convection
Answer: Radiation
What is the principle behind the operation of a refrigerator?
A. Removing heat from a low-temperature reservoir
B. Adding heat to a high-temperature reservoir
C. Maintaining constant temperature
D. Converting heat into mechanical work
Answer: Removing heat from a low-temperature reservoir
The energy required to raise the temperature of a substance is related to its:
A. Specific heat capacity
B. Latent heat
C. Thermal conductivity
D. Enthalpy
Answer: Specific heat capacity
The specific heat capacity of air is approximately:
A. 1005 J/kg·K
B. 4186 J/kg·K
C. 334 J/kg·K
D. 2260 J/kg·K
Answer: 1005 J/kg·K
The efficiency of a Carnot engine depends on:
A. The temperatures of the hot and cold reservoirs
B. The pressure of the working substance
C. The volume of the working substance
D. The type of working substance
Answer: The temperatures of the hot and cold reservoirs