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7. Two capillary tubes P and Q are dipped in water. The height of water level in capillary P is 2/3 to the height in Q capillary. The ratio of their diameters is

(a)  2 : 3

(b)  3 : 2

(c)   3 : 4

(d)  4 : 3

Ans. b

(10)

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