# Properties of Solids & Liquids (NEET Physics): Questions 167 - 171 of 190

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## Question number: 167

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

### Question

A wire of cross sectional area 3 mm 2 is just stretched between two fixed points at a temperature of 20° C. Determine the tension when the temperature falls to 20° C. Coefficient of linear expansion a = 10 -5 °C -1 and Y = 2 × 10 11 N/m 2.

### Choices

Choice (4) Response

a.

120 N

b.

102 N

c.

20 N

d.

120 KN

## Question number: 168

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

MCQ▾

### Question

The radii of two soap bubbles are r 1 and r 2. In isothermal conditions, two meet together in vacuum. Then the radius R of the resultant bubble is given by

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 169

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

MCQ▾

### Question

When a body falls in air, the resistance of air depends to a rate extent on the shape of the body, 3 different shapes disc, ball and cigar shape. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).

### Choices

Choice (4) Response

a.

2 < 3 < 1

b.

3 < 1 < 2

c.

3 < 2 < 1

d.

1 < 2 < 3

## Question number: 170

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

### Question

A copper rod 2m long is stretched by 1mm. Strain will be -

### Choices

Choice (4) Response

a.

5 × 10 -4, volumetric

b.

5 × 10 -4, longitudinal

c.

10 -4, volumetric

d.

5 × 10 -3, volumetric

## Question number: 171

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

### Question

A 10 cm thick ice block is there on the surface of water in a lake. The temperature of air is - 10° C; how much time it will take to double the thickness of the block (L = 80 cal/g, K ice = 0.004 erg/s-k, ρ ice = 0.92 gm cm -3)

### Choices

Choice (4) Response

a.

51.11 hours

b.

21 hour

c.

19.11 hours

d.

191 hours

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