Properties of Solids & Liquids (NEET Physics): Questions 91 - 94 of 188

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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.

mL=mS(37535)+12mv2J

b.

mS(57525)+mL=12mv2J

c.

mS(37528)mL=12mv2J

d.

mS(47525)+mL=12mv2J

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

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

Question number: 94

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

MCQ▾

Question

The amount of work done in blowing a soap bubble such that its diameter increases from d to D is (T = surface tension of the solution)

Choices

Choice (4) Response
a.

4π(D2d2)T

b.

2π(D2d2)T

c.

π(D2d2)T

d.

8π(D2d2)T

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