# 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

### 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

### Choices

Choice (4) Response

a.

b.

c.

d.

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