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2.3 Transfer of thermal energy

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Question 28

A scientist is explaining why a down jacket (insulated with goose down) is so effective at keeping a person warm in cold weather. The down insulation consists of fluffy feathers that trap a large amount of air in tiny pockets.

Three statements are made to explain this:

  1. The trapped air is a poor thermal conductor.
  2. Convection is minimized because the air is trapped in very small pockets and cannot move easily.
  3. The feather material itself is a poor thermal conductor.

Which statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Markscheme

2.3 Transfer of thermal energy Questions

  1. IGCSE
  2. /Physics
  3. /2.3 Transfer of thermal energy

301 exam-style questions on CIE IGCSE Physics 2.3 Transfer of thermal energy, covering 2.3.1a Thermal conductors and thermal insulators, 2.3.1b Explaining thermal conduction, 2.3.2 Convection, 2.3.3a Thermal radiation, 2.3.3b Surface colour and texture, 2.3.3c Rate of emission and absorption of radiation, and 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.

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