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Q.

A small hole is made at the bottom of a hollow sphere. The water enters into it when it is taken to a depth of 40 cm under water. If the surface tension of water is 0.07 Nm-1, diameter of the hole is

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a

10/14 mm

b

10/7 mm

c

1/14 mm

d

2/15 m m

answer is D.

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Detailed Solution

h=40cm,T=0.07N/m∆P=ρgh=2Tr⇒r=2Tρhg=2×0.07103×9.8×40×10−2⇒r=12×14×10−3m=12×14mm⇒d=2r=114mm

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