Properties of Solids & Liquids (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 11 - 12 of 12

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Question number: 11

» Properties of Solids & Liquids » Surface Energy and Surface Tension

MCQ▾

Question

A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of 60 cm below the surface. Surface tension of water is 7×102Nm1 . The diameter of the hole is,

Choices

Choice (4) Response

a.

121mm

b.

128mm

c.

114mm

d.

142mm

Question number: 12

» Properties of Solids & Liquids » Application of Surface Tension

MCQ▾

Question

Two circular glass plates each of radius R = 15 cm are pressed together with a liquid film of thickness d=2.5×106m . Assuming that the liquid completely wets the glass plates, compute the force normal to plates required to pull them apart. S. T. of liquid = 0.070 N/m.

Choices

Choice (4) Response

a.

3.95 N

b.

2.15 N

c.

4.25 N

d.

2.86 N

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