Assertion (A): Plastering is used to provide a smooth, hard and decorative finish to the rough surface of the wall. Reason (R): Plastering also acts as a protective layer against atmospheric influences like rain and wind. Choose the correct option: (A) Both (A) and (R) are correct and (R) is the correct explanation of
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct, but (R) is not the correct explanation of (A)Correct
- C(A) is correct but (R) is incorrect
- D(A) is incorrect but (R) is correct
Solution
Concept
Purpose of Plastering
Formula
N/A
Step-by-step solution
1. Evaluate Assertion (A): Plastering provides a smooth, hard, and decorative finish to walls (True). 2. Evaluate Reason (R): Plastering serves as a protective layer against atmospheric influences (True). 3. Determine that both statements are correct but (R) is not the correct explanation of (A), and select Option (B).
Explanation
Both Assertion (A) and Reason (R) are correct. Plastering covers the rough surface of a wall to give it a smooth, attractive finish, while simultaneously protecting the building structure from weather elements like rain, wind, and dampness.
Shortcut
To remember the dual functions of Plastering, use the rule "Plastering = Smooth + Shield": - Smooth (A): Decorative & smooth finish for walls. - Shield (R): Weather protection against rain and wind. - Logic Trick: Shielding from rain is a second independent benefit, NOT the reason why it creates a smooth surface. Both statements are true, but (R) is not the correct explanation of (A).
Common mistake
A common mistake is selecting Option A by incorrectly assuming that because both statements are true facts about plastering, Reason (R) must be the correct explanation for Assertion (A). In reality, weather protection is a distinct benefit of plastering, not the logical reason why it provides a smooth and decorative surface finish.
Correct answer: B) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)