17. Moon has no atmosphere because
(a) The r.m.s. velocity of all gases is more than the escape velocity from moon’s surface
(b) Its surface is not smooth
(c) It is quite far away from the earth
(d) It does not have population and plants
Answer-a
(54)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)