Multiple Choice Questions
1. Suppose 2 identical copper bars, A and B, with initial temperatures of 25°C and 75°C, respectively, are placed in contact with each other. If the specific heat of copper is independent of temperature, and if A and B do not exchange heat or work with the surroundings, is it likely that A and B will reach 24°C and 76°C, respectively?
A. Yes, because the bars are identical.
B. Yes, because heat will flow from B to A.
C. No, because heat will not flow from A to B.
D. No, because energy will not be conserved.
2. Some ocean currents carry water from the Polar Regions to warmer seas. What is the approximate temperature of a solution resulting from mixing 1.00 kg of seawater at 0°C with 1.00 kg of seawater at 5°C?
A. 1.25°C
B. 2.50°C
C. 3.25°C
D. 4.00°C
3. How much energy is gained by 18.0 g of ice if it melts at the polar ice caps?
A. 4.18 kJ
B. 5.87 kJ
C. 6.02 kJ
D. 6.17 kJ
4. Making which of the following changes to the steam engine will increase its efficiency?
A. Increasing the exhaust temperature
B. Decreasing the exhaust temperature
C. Increasing the amount of heat input
D. Decreasing the amount of heat input
5. The amount of heat that a unit of mass of a refrigerant can remove from a refrigerator is primarily dependent on which of the following characteristics of the refrigerant?
A. Heat of vaporization
B. Heat of fusion
C. Specific heat in liquid form
D. Specific heat in gaseous form
6. The amount of useful work that can be generated from a source of heat can only be
A. less than the amount of heat.
B. less than or equal to the amount of heat.
C. equal to the amount of heat.
D. equal to or greater than the amount of heat.
7. What energy transformation causes the piston of the steam engine discussed in the passage to move to the right?
A. Mechanical to internal
B. Mechanical to chemical
C. Internal to mechanical
D. Internal to electrical