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2.3 Transfer of thermal energy

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Question 75

A clothing designer explains how a winter jacket padded with down feathers keeps a person warm in cold weather. The padding consists of fluffy feathers that trap a large amount of air in tiny pockets.

Three statements are made about why this padding is a good thermal insulator:

  1. Air is a poor thermal conductor.
  2. The air is trapped in tiny pockets, which prevents the formation of convection currents.
  3. The feathers themselves are poor thermal conductors.

Which of these statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

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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