Standard Science Primary 4 Energy

Why are there small gaps between the sections of concrete on a pavement?

A To let water flow through the ground.
B To allow the concrete to expand on hot days.
C To save on the cost of concrete.
D To make the pavement look better.
Show Worked Solution

Worked Solution

Step 1: On hot days, solids like concrete gain heat and expand. Step 2: Expansion increases the volume of the concrete. Step 3: Gaps provide space for this expansion to prevent the pavement from cracking or buckling.

Correct answer: To allow the concrete 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