Properties of Solids & Liquids-Surface Energy and Surface Tension (NEET 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 Equation and cross-sectional area Equation is immersed such that it floats with its axis vertical at the liquid-liquid interface with length Equation 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.

Equation

b.

Equation

c.

Equation

d.

Equation

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