The dampness in a building is caused due to
- AAbsorption of moisture by the building materials.
- BPenetration of rainwater through unprotected tops of walls.
- CDefective construction
- DAll of the aboveCorrect
Solution
Concept
Causes of dampness in buildings
Formula
NONE
Step-by-step solution
1. Dampness occurs due to entry of moisture into various parts of a building. 2. Key causes include capillary action absorbing ground moisture, penetration of rainwater through unprotected surfaces, and poor design or construction defects. 3. Since options A, B, and C all describe valid sources of dampness, all of the above is correct. Answer: D
Explanation
Dampness in buildings arises when water enters structural components from internal or external sources. It can be caused by capillary action in porous building materials, rainwater penetrating unprotected wall tops, or defective construction practices. Because all these factors directly contribute to moisture accumulation, all of the above is the correct answer.
Why the other options are wrong
A) Moisture absorption by porous materials is only one of multiple causes. B) Rainwater penetration through unprotected tops of walls is a single contributing cause. C) Defective construction is one factor among many, making all listed options correct.
Shortcut
Building dampness results from moisture absorption, rainwater penetration, and defective construction.
Common mistake
Choosing a single specific cause of dampness instead of recognizing that all given factors contribute to it.
Correct answer: D) All of the above