# The First Law of Thermodynamics Practice Questions

The following physics revision questions are provided in support of the physics tutorial on The First Law of Thermodynamics. In addition to this tutorial, we also provide revision notes, a video tutorial, revision questions on this page (which allow you to check your understanding of the topic) and calculators which provide full, step by step calculations for each of the formula in the The First Law of Thermodynamics tutorials. The The First Law of Thermodynamics calculators are particularly useful for ensuring your step-by-step calculations are correct as well as ensuring your final result is accurate.

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Thermodynamics Learning Material
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Revision
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13.5The First Law of Thermodynamics

## Physics Revision Questions for The First Law of Thermodynamics

1) 170 J of heat energy are supplied to a gas sample. As a result, the internal energy of the gas increased by 200 J. What is the WORK DONE ON THE GAS by the surroundings?

1. 30 J
2. -30 J
3. 370 J
4. -370 J

2) The internal energy of a gas inside a cylinder during an adiabatic process increases by 20 J. What happens to the 4-kg piston of the cylinder during this process? Take g = 10 m/s2 if needed.

1. Rises up by 50 cm
2. Lowers down by 50 cm
3. Rises up by 5 m
4. Lowers down by 5 m

3) The graph below is an example of

2. Free expansion process
3. Constant volume process
4. Cyclic process

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5. Continuing learning thermodynamics - read our next physics tutorial: The Kinetic Theory of Gases. Ideal Gases