# SAT Physics Practice Test: Thermal Physics

### Test Information

10 questions

8 minutes

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1. How much heat is required to raise the temperature of a 0.04 kg stainless steel spoon from 20°C to 50°C if the specific heat of stainless steel is 0.50 kJ/kg × °C ?

A. 200 J
B. 400 J
C. 600 J
D. 800 J
E. 1,000 J

2. The melting point of copper is 1,080°C and its heat of fusion is 200 kJ/kg. If a copper coin at this temperature is completely melted by the absorption of 2,000 J of heat, what is the mass of the coin?

A.
B.
C.
D.
E.

3. Water has the specific heat 4.186 kJ/kg•°C, a boiling point of 100°C, and a heat of vaporization of 2,260 kJ/kg. A sealed beaker contains 100 g of water that’s initially at 20°C. If the water absorbs 100 kJ of heat, what will its final temperature be?

A. 100°C
B. 119°C
C. 143°C
D. 183°C
E. 239°C

4. On a cold winter day (5°C), the foundation block for a statue is filled with 2.0 m3 of concrete. By how much will the concrete’s volume increase on a very warm summer day (35°C) if its coefficient of volume expansion is 4.0 × 10–5/°C ?

A. 160 cm3
B. 1,200 cm3
C. 1,600 cm3
D. 2,400 cm3
E. 3,200 cm3

5. An ideal gas is confined to a container whose volume is fixed. If the container holds n moles of gas, by what factor will the pressure increase if the absolute temperature is increased by a factor of 2 ?

A.
B. 2
C. 2nR
D.
E.

6. Two large glass containers of equal volume each hold 1 mole of gas. Container 1 is filled with hydrogen gas (2 g/mol), and Container 2 holds helium (4 g/mol). If the pressure of the gas in Container 1 equals the pressure of the gas in Container 2, which of the following is true?

A. The temperature of the gas in Container 1 is lower than the temperature of the gas in Container 2.
B. The temperature of the gas in Container 1 is greater than the temperature of the gas in Container 2.
C. The value of R for the gas in Container 1 is the value of R for the gas in Container 2.
D. The rms speed of the gas molecules in Container 1 is lower than the rms speed of the gas molecules in Container 2.
E. The rms speed of the gas molecules in Container 1 is greater than the rms speed of the gas molecules in Container 2.

7. Through a series of thermodynamic processes, the internal energy of a sample of confined gas is increased by 560 J. If the net amount of work done on the sample by its surroundings is 320 J, how much heat was transferred between the gas and its environment?

A. 240 J absorbed
B. 240 J dissipated
C. 880 J absorbed
D. 880 J dissipated
E. None of the above

8. What’s the total work performed on the gas as it’s transformed from state a to state c, along the path indicated?

A. 1,500 J
B. 3,000 J
C. 4,500 J
D. 5,000 J
E. 9,500 J

9. During each cycle, a heat engine absorbs 400 J of heat from its high-temperature source and discards 300 J of heat into its low-temperature sink. What is the efficiency of this engine?

A.
B.
C.
D.
E.

10. Of the following, which is the best description of the second law of thermodynamics?

A. The total energy of the universe is a constant.
B. The efficiency of a heat engine can never be greater than 50 percent.
C. The amount of heat required to vaporize a liquid is greater than the amount of heat required to melt a solid of the same substance.
D. The entropy of the universe is always increasing.
E. As the altitude increases, the boiling point of water decreases.

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