Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 89 - 93 of 190

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Question number: 89

» Properties of Solids & Liquids » Hooke's Law

MCQ▾

Question

A wire of length l m and area of cross section 4 × 10 -8 m 2 increases in length by 0.4 cm when a force of 14 N is applied. Value of Y for the material of the wire will be

Choices

Choice (4) Response

a.

7.23 × 10 11 kg/m 2

b.

2.56 × 10 11 N/m 2

c.

2.46 × l0 11 N/mm 2

d.

8.75 × l0 6 N/m 2

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Question number: 90

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

MCQ▾

Question

A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle 9 with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

Choices

Choice (4) Response

a.

b.

c.

d.

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Question number: 91

» Properties of Solids & Liquids » Latent Heat

MCQ▾

Question

A bullet moving with a uniform velocity v, stops sudden after hitting the target and the whole mass melts be m, specific heat S, initial temperature 28°C, melting point 375 °C and the latent heat L. Then v is given by

Choices

Choice (4) Response

a.

b.

c.

d.

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Question number: 92

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

Length of a wire is doubled, when 20 × 10 8 N/m 2 stress is applied on it. Its Young’s modulus of elasticity in N/m 2 will be

Choices

Choice (4) Response

a.

10 × 10 8

b.

20 × 10 10

c.

20 × 10 9

d.

20 × 10 8

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Question number: 93

» Properties of Solids & Liquids » Heat Transfer » Radiation

Assertion-Reason▾

Assertion (Ꭺ)

As temperature of a black body is raised, wavelength corresponding to maximum energy reduces.

Reason (Ꭱ)

Higher temperature would mean higher energy and hence higher wavelength.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

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

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