Q891
An oil drop spreads over water because
A.
Oil is lighter than water
B.
Oil is more viscous
C.
Oil does not mix with water
D.
water has a higher surface tension
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
Surface tension of oil is smaller than that of water. When oil is dropped on the surface of water, the force stretches the oil drops on all sides. Hence the oil spreads over the surface of water.