46. Which of the following statements is true about a Carnot engine?
A) A Carnot engine has 100% efficiency
B) A Carnot engine violates the second law of thermodynamics
C) A Carnot engine is a reversible heat engine
D) A Carnot engine operates on the Rankine cycle
47. Which of the following is a measure of the heat required to change the phase of a substance?
A) Specific heat
B) Heat capacity
C) Latent heat
D) Enthalpy
48. Which of the following statements is true about convection?
A) Convection is the transfer of heat through a solid material
B) Convection only occurs in liquids and gases
C) Convection is the transfer of heat by electromagnetic waves
D) Convection occurs in all three states of matter
49. Which of the following statements is true about the second law of thermodynamics?
A) The second law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another
B) The second law of thermodynamics states that the total entropy of a closed system cannot decrease over time
C) The second law of thermodynamics states that all heat engines have 100% efficiency
D) The second law of thermodynamics states that the entropy of a perfect crystal at absolute zero is zero
50. Which of the following is a measure of the amount of thermal energy in a system?
A) Temperature
B) Heat
C) Entropy
D) Enthalpy
