Question

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
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.

• A. A is true but R is false.
• B. A is false but R is true.
• C. Both A and R are true and R is the correct explanation of A.
• D. Both A and R true but R is NOT the correct explanation of A.

Answer 1

The Correct Option is B

To determine the correct answer to this question, let's analyze both the assertion and the reason provided: 

1. Assertion A: "Houses made of concrete roofs overlaid with foam keep the room hotter during summer." This statement hints that foam insulation leads to increased temperatures inside a house during summer.
2. Reason R: "The layer of foam insulation prohibits heat transfer, as it contains air pockets." This statement explains that foam insulation reduces heat transfer due to air pockets present within it.
3. Let's evaluate the correctness of each statement individually:
   1. Reason R is true: Foam as an insulating material effectively prevents heat transfer because it contains air pockets. Air is a poor conductor of heat, and when trapped in foam, it acts as a barrier to heat flow. This reduces the exchange of heat between the exterior and interior of a house.
   2. Assertion A is false: If foam insulation works as intended, it actually helps in keeping the indoors cooler during summer by minimizing the penetration of external heat. The presence of foam should make the house cooler, not hotter.
4. In light of the above analysis, the reason (R) correctly states a property of foam insulation, but the assertion (A) falsely claims that foam insulation makes a house hotter. Thus, the assertion is incorrect while the reason is correct.

Therefore, the correct answer is: A is false but R is true.