Question

If a submarine is to dive, its ballast tanks are ……………, so that the average density of the submarine becomes …………… than the density of sea water.
(a) filled with water, greater
(b) filled with water, lower
(c) emptied, greater
(d) emptied, lower

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Answer

(a) filled with water, greater

Reason — If a submarine is to dive, its ballast tanks are, filled with water so that the average density of the submarine becomes greater than the density of seawater

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