Properties of Solids & Liquids-Elastic Behavior (NEET Physics): Questions 6 - 10 of 28

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Question number: 6

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A wire of cross sectional area 4mm 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 and Y = 2 × 10 11 N/m 2.

Choices

Choice (4) Response

a.

220 N

b.

120 KN

c.

160 N

d.

120 N

Question number: 7

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The force required to separate two glass plates of area 3 ×10 -2 m -2 with a film of water 0.03 m thick between them, is (Surface tension of water is 70 × 10 -3 N/m)

Choices

Choice (4) Response

a.

280 N

b.

130 N

c.

140 N

d.

380 AT

Question number: 8

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A uniform steel wire of density 7800 kg/m 3 is 2.5 m long and weighs 15.6 × 10 -3 kg. It extends by 1.25 mm when loaded by 8 kg. Calculate the value of young’s modulus of elasticity for steel.

Choices

Choice (4) Response

a.

19.6 × 10 11 N/m 2

b.

1.96 × 10 11 N/m 2

c.

196 × 10 11 N/m 2

d.

All of the above

Question number: 9

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A 4.0 m long copper wire of cross sectional area 1.2 cm 2 is stretched by a force of 4.8 × 10 3 N stress will be -

Choices

Choice (4) Response

a.

4.0 × l0 7 N/mm 2

b.

4.0 × l0 7 KN/m 2

c.

4.0 × l0 7 N/m 2

d.

None of the above

Question number: 10

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The work done in increasing the length of a one meter long wire of cross-sectional area 1mm 2 through 1mm will be

(Y = 3 × 10 11 N/m 2)

Choices

Choice (4) Response

a.

10 J

b.

0.1 J

c.

250 J

d.

0.15 J

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