Standard Science Primary 4 Energy

Why are there small gaps left between the sections of metal railway tracks?

A To save money on metal.
B To let rainwater drain away.
C To make the train move faster.
D To allow the tracks to expand on hot days.
Show Worked Solution

Worked Solution

Step 1: Metals gain heat on hot days. Step 2: Heat causes solids to expand (increase in size). Step 3: Without gaps, the expanding tracks would buckle or bend.

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

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free