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16. 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

Ans. c

(8)

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