Question detail
What occurs to gas pressure when the volume of the gas is decreased at constant temperature (Increasing the pressure of a gas (physics only) (HT only)) (Increasing the pressure of a gas (physics only) (HT only); definition focus: (Physics only) (HT only) Explain why a gas may get hotter when it is compressed quickly) (Increasing the pressure of a gas (physics only) (HT only); definition focus: (Physics only) (HT only) Explain why a gas may get hotter when it is compressed quickly)
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. Gas pressure increases.
- B. This confuses HT only with a different particle-model idea in Particle model and pressure.
- C. This gives a vague particle statement without answering the definition focus.
- D. This reverses the cause and effect for Increasing the pressure of a gas (physics only) (HT only).
Answer
The correct answer is Gas pressure increases..
Explanation
Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: What occurs to gas pressure when the volume of the gas is decreased at constant temperature (Increasing the pressure of a gas (physics only) (HT only)) (Increasing the pressure of a gas (physics only) (HT only); definition focus: (Physics only) (HT only) Explain why a gas may get hotter when it is compressed quickly) (Increasing the pressure of a gas (physics only) (HT only); definition focus: (Physics only) (HT only) Explain why a gas may get hotter when it is compressed quickly). The correct response is Gas pressure 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 why a gas may get hotter when it is compressed quickly. 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 609 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.
Common mistake
Gas Compression Temperature Increase
Students often think that a gas gets hotter when compressed due to an increase in pressure alone, without considering the role of kinetic energy.
Emphasize that compressing a gas increases the kinetic energy of its particles, which in turn raises the temperature. Explain the relationship between work done on the gas and energy transfer.
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