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18. A rectangular block is 5 cm × 5 cm × 10cm in size. The block is floating in water with 5 cm side vertical. If it floats with 10 cm side vertical, what change will occur in the level of water?

(a)  No change

(b)   It will rise

(c)   It will fall

(d)   It may rise or fall depending on the density of block

Explanation- (a) Since no change in volume of displaced water takes place, hence level of water remains same.

(11)

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