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2.1.2a Particle structure and motion in solids, liquids and gases

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Question 27

Tiny pollen grains suspended in water are viewed under a microscope. The pollen grains are observed to move in a random, jerky manner. Which statement correctly explains this observation?

A

The water is composed of much smaller, fast-moving molecules that are constantly and randomly colliding with the pollen grains.

B

Convection currents in the water are carrying the pollen grains in random directions.

C

The pollen grains are living organisms that are actively swimming through the water.

D

The temperature of the water is steadily increasing, causing the grains to expand.

Markscheme

2.1.2a Particle structure and motion in solids, liquids and gases Questions

  1. IGCSE
  2. /Physics
  3. /2.1.2a Particle structure and motion in solids, liquids and gases

151 exam-style questions on CIE IGCSE Physics 2.1.2a Particle structure and motion in solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.

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