Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Wind is an active force for ventilation.
Reason (R): Back to back construction of houses do not permit cross ventilation.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Wind is an important natural factor for ventilation, while proper building design is necessary for effective cross ventilation.

Answer 1

The Correct Option is B

Concept: Ventilation is the process of supplying fresh air and removing contaminated air from an enclosed space.
• Wind acts as an active natural force that helps movement of air and improves ventilation.
• Cross ventilation occurs when air enters through one opening and exits through another opposite opening. Improper house construction can obstruct airflow and reduce effective ventilation.

Step 1: Analyze Assertion (A).
Wind helps in movement and circulation of air, thereby improving natural ventilation.
Hence, Assertion (A) is correct.

Step 2: Analyze Reason (R).
Back-to-back construction of houses blocks airflow and prevents proper cross ventilation.
Hence, Reason (R) is also correct.

Step 3: Check whether Reason explains Assertion.
The reason discusses obstruction of cross ventilation due to house construction, whereas the assertion states that wind is an active force for ventilation. Although both statements are correct, the reason does not directly explain why wind acts as an active force for ventilation. Therefore, Reason (R) is not the correct explanation of Assertion (A). Hence, the correct answer is: \[ \boxed{(B)\ \text{Both (A) and (R) are correct but (R) is not the correct explanation of (A)}} \]