CAIE IGCSE Physics 2.3.2 Convection Topic Practice

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Covered syllabus points

2.3.2.1—Convection is an important method of2.3.2.2—Convection in liquids and gases in

Question 1

[Maximum number: 2]

Fig. 4.1 shows part of a container used to store a mixture of liquid and gaseous oxygen.

Fig. 4.1

Fig. 4.1

The temperature of the liquid oxygen is −160∘C-160^{\circ} \mathrm{C}.

The container is made of steel and there is a vacuum between the inner and outer walls. The outer wall of the container is at room temperature.

State two methods of thermal energy transfer that a vacuum prevents.

1

2

Question 2

[Maximum number: 3]

Fig. 3.1 shows a small block of ice floating in a beaker of warm water.

Fig. 3.1

Fig. 3.1

Energy is transferred from the water to the block of ice.

The temperature of the water near the ice decreases first.

Explain how convection causes the temperature of all the water in the beaker to decrease.

Question 3

[Maximum number: 1]

A copper cooking pan contains water. Fig. 2.1 shows the pan on a hotplate of a cooker.

Fig. 2.1

Fig. 2.1

Copper is a metal.

The thermal energy passes into the water through the base of the pan.

Identify the main method by which thermal energy is transferred throughout the water.

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