Standard Science Primary 4 Energy

Jun Jie noticed that there are small gaps between the metal tracks of a railway. These gaps are there to __________.

A save the amount of metal used
B allow the tracks to expand on hot days
C prevent the tracks from rusting
D allow the train to move faster
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Worked Solution

Step 1: Metal expands when it gains heat. Step 2: On hot days, the tracks expand in length. Step 3: Gaps provide space so the tracks do not buckle or bend.

Correct answer: allow the tracks to expand on hot days

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