The First Law of Thermodynamics Practice Questions

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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

Correct Answer: A

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

Correct Answer: D

3) The graph below is an example of

Physics Tutorials: This image provides visual information for the physics tutorial The First Law of Thermodynamics
  1. Adiabatic process
  2. Free expansion process
  3. Constant volume process
  4. Cyclic process

Correct Answer: B

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

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