# Entropy and the Second Law of Thermodynamics Practice Questions

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13.10Entropy and the Second Law of Thermodynamics

## Physics Revision Questions for Entropy and the Second Law of Thermodynamics

1) 500 g of water steam at 100°C are placed in thermal contact with some ice at 0°C. What is the change in the entropy in the universe? Take Lsteam = 2 224 000 J/kg.

1. 2981J/K
2. 4073J/K
3. 2224J/K
4. 1092J/K

2) A heat engine of 80% efficiency is used to move an object by 500 m by applying a force of 2000 N. What is the total heat energy produced by the source during this process?

1. 0.8 MJ
2. 5000 J
3. 1.25 MJ
4. 3200 J

3) A Carnot engine has an efficiency of 80%. It operates by using the atmosphere as a cold reservoir. If the temperature outside is 7°C, what is the maximum temperature in the hot reservoir of this engine?

1. 35°C
2. 1400 K
3. 350 K
4. 224°C

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