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2.3.1a Thermal conductors and thermal insulators

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Question 45

An ice cube is held at the bottom of a glass test-tube filled with water using a heavy metal gauze. The water near the top of the test-tube is heated until it boils, but the ice at the bottom does not melt.

Which row correctly describes the thermal conductivities of glass and water, and how convection affects the transfer of heat downwards?

Thermal conductivity of glassThermal conductivity of waterConvection currents in the water
Apoorpoortransfer heat downwards
Bpoorpoortransfer heat upwards
Cgoodpoortransfer heat upwards
Dpoorgoodtransfer heat downwards
A

Glass: poor; Water: poor; Convection: transfer heat downwards

B

Glass: poor; Water: poor; Convection: transfer heat upwards

C

Glass: good; Water: poor; Convection: transfer heat upwards

D

Glass: poor; Water: good; Convection: transfer heat downwards

Markscheme

2.3.1a Thermal conductors and thermal insulators Questions

  1. IGCSE
  2. /Physics
  3. /2.3.1a Thermal conductors and thermal insulators

67 exam-style questions on CIE IGCSE Physics 2.3.1a Thermal conductors and thermal insulators. Each one has a worked solution and a mark scheme showing where the marks go.

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