31. When a drop of water is dropped on oil surface, then
(a) It will mix up with oil
(b) It spreads in the form of a film
(c) It will deform
(d) It remains spherical
Ans. d
(13)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (126)