Heat Conduction
Given below are two statements: One is labelled as Assertion and the other is labelled as Reason .
Assertion A: Houses made of concrete roofs overlaid with foam keep the room hotter during summer.
Reason R: The layer of foam insulation prohibits heat transfer, as it contains air pockets. In the light of the above statements, choose the correct answer from the options given below.
Show answer and solution
Answer: (b)
- Foam with trapped air is a poor conductor, so it blocks heat flow: R is true.
- Blocking heat entering from the hot roof keeps the room cooler in summer, not hotter: A is false.
- So the answer is (b) A is false but R is true.