IGCSE Physics (0625) 2.3 Thermal processes – 2.3.1 Conduction Paper 1

Question

Four samples of materials with the same dimensions are tested.

Which material gives the highest rate of thermal conduction?

  1. rubber

  2. copper

  3. plastic

  4. steel

Answer/Explanation

Ans: B

Question

Two students carry out different experiments to compare the abilities of different metals to conduct thermal energy.

                         

In experiment 1, the bar is heated for one minute and the length of wax strip that melts is measured.

In experiment 2, the bar is heated and the time taken for the pin to drop off is measured.

What happens to each of these measurements when a better conductor of thermal energy is tested?

 

length of melted wax strip

time taken for the pin to drop

A

decreases

decreases

B

decreases

increases

C

increases

decreases

D

increases

increases

Answer/Explanation

Ans: C

Question

Four campers are warming their food on a fire.

They use different rods, each of the same dimensions, to hold their food near the fire.

                                                                             

Which material is the best choice to prevent their hands from getting too hot?

  1. aluminium

  2. copper

  3. steel

  4. wood

Answer/Explanation

Ans: D

Question

In which does thermal conduction not occur?

  1. a gas

  2. a liquid

  3. a solid

  4. a vacuum

Answer/Explanation

Ans: D

Question

Ice is trapped by a metal gauze at the bottom of a tube containing water.

The water is heated strongly at the top, but the ice only melts very slowly.

                 

Why does the ice melt so slowly?

  1. Heat energy always travels upwards.

  2. Hot water is more dense than cold water.

  3. Metal gauze does not allow heat to pass through.

  4. Water is a poor conductor of heat.

Answer/Explanation

Ans: D

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