Question detail
What happens to the internal energy of a gas when it is compressed?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Particle model and pressure
Question
- A. It decreases
- B. It remains the same
- C. It increases
- D. It becomes zero
Answer
The correct answer is It increases.
Explanation
Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: What happens to the internal energy of a gas when it is compressed. The correct response is It increases, because gas pressure comes from particle collisions with container walls. In Increasing the pressure of a gas (physics only) (HT only), the marking point should connect directly to (Physics only) (HT only) Explain that compressing a gas can increase its internal energy. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Particle model and pressure, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 594 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.
Common mistake
Confusing Internal Energy with Temperature
Students often confuse the concepts of internal energy and temperature, thinking that increasing internal energy directly means an increase in temperature.
To fix this, remember that while increasing internal energy can lead to a temperature increase, it depends on the specific heat capacity of the gas and the amount of work done on it. Focus on understanding the relationship between internal energy, temperature, and the physical processes involved.
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