Properties of Solids & Liquids-Surface Energy and Surface Tension (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 9 - 13 of 23

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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.

b.

c.

d.

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.

b.

c.

d.

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

Question number: 12

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

MCQ▾

Question

A film of water is formed between two straight parallel wires of length 10 cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water = 70 × 10 -2 N/m)

Choices

Choice (4) Response

a.

2.88 × 10 -5 Joule

b.

1.44 × 10 -5 Joule

c.

7.22 × 10 -6 Joule

d.

5.76 × 10 -5 Joule

Question number: 13

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

MCQ▾

Question

Which graph represents the variation of surface tension with temperature over small temperature ranges for water?

Choices

Choice (4) Response

a.

Curve of Surface tension → Temparature. choice A.

Curve of Surface Tension → Temparature. Choice a.

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

b.

Curve of Surface tension → Temparature.Choice B

Curve of Surface Tension → Temparature. Choice B

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

c.

Curve of Surface tension → Temparature. Choice C

Curve of Surface Tension → Temparature. Choice C

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

d.

Curve of Surface tension → Temparature. Choice D

Curve of Surface Tension → Temparature. Choice D

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

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