Properties of Solids & Liquids-Elastic Behavior (NEET Physics): Questions 21 - 26 of 28

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Question number: 21

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The lengths and radii of two wires of same material are respectively L, 2L, and 2R, R. Equal weights are applied on then. If the elongations produced in them are l 1 and l 2 respectively then their ratio will be

Choices

Choice (4) Response

a.

4: 1

b.

2: 1

c.

8: 1

d.

1: 8

Question number: 22

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A brass rod is to support a load of 500 N. If its elastic limit is 5.0 × l0 8 N/m 2 its minimum diameter must be -

Choices

Choice (4) Response

a.

3.71mm

b.

1.13mm

c.

1.26mm

d.

2.26mm

Question number: 23

» Properties of Solids & Liquids » Elastic Behavior

Assertion-Reason▾

Assertion (Ꭺ)

The bridges declared unsafe after a long use.

Reason (Ꭱ)

Elastic strength of bridges losses with time.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 24

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A spring is stretched by 6 cm when a load of 5.4 × 10 6 dyne is suspended from it. Work done will be

Choices

Choice (4) Response

a.

16.2 × 10 6 erg

b.

8 × 10 6 J

c.

8.1 × 10 6 erg

d.

8.1 × 10 6 J

Question number: 25

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The ratio of radii of two wires of same material is 4: 1. If these wires are stretched by equal forces, then the ratio of stresses produced in them will be

Choices

Choice (4) Response

a.

1: 4

b.

1: 16

c.

2: 1

d.

4: 1

Question number: 26

» 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

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