12. The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 of the density of mercury, the depth of the lake is
(a) 5 m (b) 10 m
(c) 15 m (d) 20 m
Answer-c
(27)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)