Home PYQs UPPSC UPPSC MCQs Prelims 1994 (GS Paper I)

Question

Oil spreads over the surface of water because:

  1. Oil is more dense than water
  2. Oil is less dense than water
  3. Oil has more surface tension than, water
  4. Oil has less surface tension than water

Answer:

Option D: Oil has less surface tension than water

Detailed Solution:

The correct answer is “Oil has less surface tension than water”.

Oil spreads over the surface of water because it has a lower surface tension compared to water. This difference in surface tension causes the oil to spread out to minimize the surface energy.