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

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Question: In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)

Options:

  1. Heat is added and work is done on the system
  2. Heat is removed and work is done by the system
  3. Heat is added and work is done by the system
  4. No heat exchange occurs

Correct Answer: Heat is added and work is done on the system

Exam Year: 2020

Solution: 

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

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

Practice Questions

Q1
In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)
  1. Heat is added and work is done on the system
  2. Heat is removed and work is done by the system
  3. Heat is added and work is done by the system
  4. No heat exchange occurs

Questions & Step-by-Step Solutions

In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)
  • Step 1: Understand what a closed system is. A closed system can exchange energy (in the form of heat or work) but not matter with its surroundings.
  • Step 2: Know what internal energy means. Internal energy is the total energy contained within the system, including kinetic and potential energy of the particles.
  • Step 3: Recall the first law of thermodynamics. This law states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system.
  • Step 4: If the internal energy increases, it means that the change in internal energy is positive.
  • Step 5: Since the change in internal energy is positive, it can happen in two ways: either heat is added to the system (positive heat) or work is done on the system (positive work).
  • Step 6: Therefore, if the internal energy increases, it indicates that heat is added to the system and/or work is done on the system.
  • First Law of Thermodynamics – The principle that energy cannot be created or destroyed, only transformed, which relates changes in internal energy to heat added and work done on or by the system.
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