Advanced Science Primary 4 Energy

Gaps are often left between railway tracks in Singapore. What is the purpose of these gaps?

A To reduce the cost of the metal used.
B To allow the tracks to expand on hot days.
C To allow rainwater to flow through.
D To make the train move faster.
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Worked Solution

Step 1: Metal tracks gain heat from the sun. Step 2: Materials expand when they gain heat. Step 3: Gaps provide space for expansion so the tracks do not buckle or bend.

Correct answer: To allow the tracks to expand on hot days.

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