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 :
Assertion (A) Analysis
Statement (A): Wind is an active force for ventilation.
This statement is correct. Wind pressure differences across building surfaces drive air movement, playing a crucial role in natural ventilation, particularly cross-ventilation.
Reason (R) Analysis
Statement (R): Back to back construction of houses do not permit cross ventilation.
This statement is also correct. Buildings constructed back-to-back typically share a common wall and have openings on only one exterior face. This design prevents air from flowing through the building from one side to the other, limiting cross-ventilation.
Evaluating the Explanation
The question asks if Reason (R) correctly explains Assertion (A).
- Assertion (A) highlights the role of wind in ventilation.
- Reason (R) describes a construction limitation that hinders cross-ventilation.
While both statements are true, the fact that a specific construction type (back-to-back) limits cross-ventilation does not explain *why* wind is an active force for ventilation in general. The reason wind is active relates to pressure dynamics, not the lack of it in specific building designs.
Final Choice
Both statements (A) and (R) are correct individually. However, (R) does not explain the reason behind (A). Therefore, the correct option is B.
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