Properties of Solids & Liquids-Surface Energy and Surface Tension (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 6 - 8 of 23

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Question number: 6

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

MCQ▾

Question

A film of water is formed between two straight parallel wires of length 15 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.

2.16 × 10 -5 Joule

b.

1.44 × 10 -5 Joule

c.

7.22 × 10 -6 Joule

d.

5.76 × 10 -5 Joule

Question number: 7

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

MCQ▾

Question

A homogeneous solid cylinder of length L and cross-sectional area is immersed such that it floats with its axis vertical at the liquid-liquid interface with length in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P Q. Then density of solid is given by

Homogeneous solid cylinder in liquid

Homogeneous Solid Cylinder in Liquid

Here in above fig we show that homogenous cylinder of length in liquid, phase interface with length L4.

Choices

Choice (4) Response

a.

b.

c.

d.

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.

b.

c.

d.

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