39. Oil spreads over the surface of water whereas water does not spread over the surface of the oil, due to
(a) Surface tension of water is very high
(b) Surface tension of water is very low
(c) Viscosity of oil is high
(d) Viscosity of water is high
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a