# Properties of Solids & Liquids-Surface Energy and Surface Tension (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 5 - 7 of 23

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## Question number: 5

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

MCQ▾

### Question

Which of the following statements are true in case when two water. drops coalesce and make a bigger drop?

(1) Energy is released.

(2) Energy is absorbed.

(3) The surface area of the bigger drop is smaller than the sum of the surface areas of both the drops.

(4) The surface area of the bigger drop is greater than the sum of the surface areas of both the drops.

select the correct answers and mark it according to the following codes:

### Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

## 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.

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