Standard Science Primary 4 Energy

Why are gaps left between the sections of a metal railway track?

A To save the amount of metal used in construction
B To make the train move faster
C To allow the tracks to contract on a cold day
D To allow the tracks to expand on a hot day without buckling
Show Worked Solution

Worked Solution

Step 1: Metals gain heat and expand on hot days. Step [2-9]: If there is no space, the expanding metal will push against itself and bend. Step [2-9]: Gaps provide the necessary space for expansion.

Correct answer: To allow the tracks to expand on a hot day without buckling

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

Start Free Trial — 7 Days Free