Duration: 6:29

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5

A U-tube with both ends open to the atmosphere is partially filled with water. Oil which is immiscible with water, is poured into one side until it stands at a distance of \( 10 \mathrm{~mm} \) above the water level on the other side. Meanwhile the water rises by \( 65 \mathrm{~mm} \) from its original level (see diagram), the density of the oil is
(a) \( 650 \mathrm{~kg} \mathrm{~m}^{-3} \)
(b) \( 425 \mathrm{~kg} \mathrm{~m}^{-3} \)
(c) \( 800 \mathrm{k} \mathrm{g} \mathrm{m}^{-3} \)
(d) \( 928 \mathrm{~kg} \mathrm{~m}^{-3} \)
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