CAIE IGCSE Physics 2.3.1 Conduction Topic Practice

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Covered syllabus points

2.3.1.1—Experiments to demonstrate the2.3.1.2—Thermal conduction in all solids in2.3.1.3—Describe, in terms of particles, why2.3.1.4—There are many solids that conduct

Question 1

[Maximum number: 1]

A rod is made half of aluminium and half of glass.
A pin is attached to each end of the rod by wax.
The rod is heated at the centre.

A pin falls off when the wax melts.

Figure for Question 1 — CAIE IGCSE Physics

Which statement is correct?

A

Pin P falls off first because aluminium is a better thermal conductor than glass.

B

Pin P falls off first because aluminium is a worse thermal conductor than glass.

C

Pin Q falls off first because glass is a better thermal conductor than aluminium.

D

Pin Q falls off first because glass is a worse thermal conductor than aluminium.

Question 2

[Maximum number: 6]

Fig. 5.1 shows two containers, each filled with hot water.

Fig. 5.1

Fig. 5.1

The outer surface of the metal container is hot.

Question (a)

(a)

Explain how electrons transfer thermal energy through the metal of the container.

[ 3 ]

Question (b)

(b)

The outer surface of the non-metal container is much cooler than the outer surface of the metal container.

Explain why a non-metal conducts thermal energy less well than a metal.

[ 1 ]

Question (c)

(c)

Explain, in terms of particles, why gases are poor thermal conductors compared to non-metal solids.

[ 2 ]
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