Ques.
i. She sings a sweet song.
. Are you eating apples?
Columbus discovered America.
vii. He had written the letter.
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The relative density of a liquid can be measured using a hydrometer. This consists of a bulb attached to a stalk of constant cross-sectional area, as shown in the adjacent diagram. First the hydrometer is floated in the reference liquid (shown in light blue), and the displacement (the level of the liquid on the stalk) is marked (blue line)
Explanation:
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