Question detail
In a fixed mass of gas at constant temperature, what is the effect of increasing the volume on the gas pressure (Pressure in gases (physics only)) (Pressure in gases (physics only); definition focus: (Physics only) State that pressure multiplied by volume is constant for a fixed mass of gas at constant temperature) (Pressure in gases (physics only); definition focus: (Physics only) State that pressure multiplied by volume is constant for a fixed mass of gas at constant temperature)
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. The pressure decreases
- B. This confuses pressure 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 Pressure in gases (physics only).
Answer
The correct answer is The pressure decreases.
Explanation
Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: In a fixed mass of gas at constant temperature, what is the effect of increasing the volume on the gas pressure (Pressure in gases (physics only)) (Pressure in gases (physics only); definition focus: (Physics only) State that pressure multiplied by volume is constant for a fixed mass of gas at constant temperature) (Pressure in gases (physics only); definition focus: (Physics only) State that pressure multiplied by volume is constant for a fixed mass of gas at constant temperature). The correct response is The pressure decreases, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Pressure in gases (physics only), the marking point should connect directly to (Physics only) State that pressure multiplied by volume is constant for a fixed mass of gas at constant temperature. 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 539 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.
Common mistake
Misunderstanding Pressure-Volume Relationship
Students often confuse the relationship between pressure and volume, thinking that pressure increases when volume increases.
Remember that for a fixed mass of gas at constant temperature, pressure multiplied by volume is constant; thus, increasing volume decreases pressure.
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