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2.1 Kinetic particle model of matter

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Question 126

Brownian motion can be observed when pollen grains are suspended in water.

Which of the following statements about this observation are correct?

  1. The motion of the pollen grains is caused by the constant bombardment of smaller, fast-moving water molecules.
  2. The pollen grains move in a continuous, smooth curved path.
  3. The average speed of the pollen grains increases when the temperature of the water is increased.
A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2, and 3

Markscheme

2.1 Kinetic particle model of matter Questions

  1. IGCSE
  2. /Physics
  3. /2.1 Kinetic particle model of matter

321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.

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