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1.3 Pressure

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Question 22
F

A student makes this statement.

'When a gas expands at constant temperature, its pressure decreases because the particles slow down.'

Which statement correctly explains why the pressure decreases?

[1]
A

The particles keep the same speed but travel further, so they hit the walls less often

B

The particles speed up but spread out, so each one hits the walls with less force

C

The particles keep the same speed but lose mass, so each hit on the walls is weaker

D

The particles slow down but hit the walls more often, so the pressure falls slightly

Markscheme

1.3 Pressure Questions

  1. GCSE
  2. /Physics
  3. /1.3 Pressure

50 exam-style questions on OCR GCSE Physics 1.3 Pressure, covering 1.3.1 Molecular motion, temperature and gas pressure, 1.3.2 Gas pressure at constant volume, 1.3.3 Compressing and expanding gases, 1.3.4 Gas volume and pressure at constant temperature, 1.3.5 Doing work on a gas, 1.3.6 The Earth's atmosphere and atmospheric pressure, 1.3.7 Atmospheric pressure and height, 1.3.8 Floating and sinking, 1.3.9 Pressure in liquids and upthrust, and 1.3.10 Pressure differences with depth. Each one has a worked solution and a mark scheme showing where the marks go.

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