41. Which of the following is an example of a heat exchanger?
A) A refrigerator
B) A light bulb
C) A space heater
D) A car radiator
42. Which of the following is a unit of heat energy?
A) Joule
B) Newton
C) Watt
D) Volt
43. Which of the following is a measure of the disorder or randomness of a system?
A) Entropy
B) Enthalpy
C) Specific heat
D) Heat capacity
44. Which of the following is a measure of the rate of heat transfer through a material?
A) Thermal conductivity
B) Specific heat
C) Heat capacity
D) Enthalpy
45. Which of the following statements is true about the first law of thermodynamics?
A) Energy cannot be created or destroyed, only converted from one form to another
B) The total entropy of a closed system cannot decrease over time
C) The efficiency of a heat engine is always less than 100%
D) The entropy of a perfect crystal at absolute zero is zero
