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2.3.4 Consequences of thermal energy transfer

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Question 25

A hiker wears a cold-weather jacket filled with natural goose down. The down consists of many fluffy feathers that trap small pockets of air.

She explains to her companion how this jacket is so effective at keeping her warm. Three statements are proposed:

  1. Air is an excellent thermal insulator (a poor thermal conductor), which reduces heat loss by conduction.
  2. The air is trapped in very small pockets, preventing it from circulating and thus minimizing heat transfer by convection.
  3. The organic 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

2.3.4 Consequences of thermal energy transfer Questions

  1. IGCSE
  2. /Physics
  3. /2.3.4 Consequences of thermal energy transfer

62 exam-style questions on CIE IGCSE Physics 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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