Standard Science Primary 4 Energy

Gaps are often found between the concrete slabs of a pavement. What is the purpose of these gaps?

A To let water flow through.
B To allow the concrete to expand on a hot day.
C To allow the concrete to contract on a cold day.
D To save on the cost of concrete.
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Worked Solution

Step 1: On hot days, concrete gains heat and expands. Step 2: If there are no gaps, the expanding slabs will push against each other and crack. Step 3: Gaps provide space for expansion.

Correct answer: To allow the concrete to expand on a hot day.

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