Home PYQs UPPSC UPPSC MCQs Prelims 1997 (GS Paper I)

Question

Assertion (A): Detergents easily remove oil and dirt from soiled garments.
Reason (R): Detergents increase the surface tension of water.

  1. Both A and R are true and R is the correct explanation of A
  2. Both A and R are true but R is not the correct explanation of A
  3. A is true but R is false
  4. A is false but R is true

Answer:

Option C: A is true but R is false

Detailed Solution:

The correct answer is “A is true but R is false”.

Detergents actually decrease the surface tension of water, not increase it. By reducing the surface tension, detergents allow water to spread more easily and penetrate fabrics, which helps to lift and remove oil and dirt.