Properties of Solids & Liquids-Surface Energy and Surface Tension (NEET Physics): Questions 8 - 11 of 23

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Question number: 8

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

MCQ▾

Question

A solid sphere of density n ( > 1) times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by

Solid sphere in water lighter than water

Solid Sphere in Water Lighter Than Water

Here in above fig we show that the sphere in water tank suspended by a string tied to its base.

Choices

Choice (4) Response

a.

mgη1

b.

(η1η)mg

c.

ηmg

d.

(η1)mg

Question number: 9

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

MCQ▾

Question

A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle 9 with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

Choices

Choice (4) Response

a.

W2πrTcosθ

b.

2πrTcosθW

c.

2πrT+W

d.

2πrTcosθ+W

Question number: 10

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

MCQ▾

Question

The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T = surface tension of the solution)

Choices

Choice (4) Response

a.

4π(D2d2)T

b.

2π(D2d2)T

c.

π(D2d2)T

d.

8π(D2d2)T

Question number: 11

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

MCQ▾

Question

Two soap bubbles of radii r 1 and r 2 equal to 2.5 cm and 3.9 cm are touching each other over a common surface S 1 S 2. Its radius will be

Choices

Choice (4) Response

a.

6.96 cm

b.

4.45 cm

c.

6.90 cm

d.

4.20 cm

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