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In a closed system, if the internal energy of the system increases, what can be

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Question: In a closed system, if the internal energy of the system increases, what can be said about the work done and heat transfer?

Options:

  1. Work done is positive, heat is absorbed
  2. Work done is negative, heat is released
  3. Work done is zero, heat is zero
  4. Work done is positive, heat is released

Correct Answer: Work done is positive, heat is absorbed

Solution: 

According to the first law of thermodynamics, if the internal energy increases, it implies that either work is done on the system or heat is absorbed.

In a closed system, if the internal energy of the system increases, what can be

Practice Questions

Q1
In a closed system, if the internal energy of the system increases, what can be said about the work done and heat transfer?
  1. Work done is positive, heat is absorbed
  2. Work done is negative, heat is released
  3. Work done is zero, heat is zero
  4. Work done is positive, heat is released

Questions & Step-by-Step Solutions

In a closed system, if the internal energy of the system increases, what can be said about the work done and heat transfer?
Correct Answer: Work is done on the system or heat is absorbed.
  • Step 1: Understand that a closed system means no matter can enter or leave the system, but energy can be exchanged.
  • Step 2: Know that internal energy is the total energy contained within the system.
  • Step 3: Recall the first law of thermodynamics, which states that the change in internal energy (ΔU) is equal to the heat added to the system (Q) minus the work done by the system (W).
  • Step 4: If the internal energy increases (ΔU > 0), it means that the heat added to the system (Q) is greater than the work done by the system (W).
  • Step 5: Therefore, either heat is absorbed by the system (Q > 0) or work is done on the system (W < 0).
  • First Law of Thermodynamics – The principle that energy cannot be created or destroyed, only transformed, which relates changes in internal energy to heat transfer and work done.
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