NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1226 - 1230 of 2184

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Question number: 1226

» Properties of Solids & Liquids » Latent Heat

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Question

A lead bullet at 25°C just n tits when stopped by an obstacle. Assuming that 25 % of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M. P. of lead = 320°C, specific heat of lead = 0.02 cal/gm°C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)

Choices

Choice (4) Response

a.

307.5 m/sec

b.

4.010 m/sec

c.

0.365 m/sec

d.

Question does not provide sufficient data or is vague

Question number: 1227

» Wave Optics » Huygens' Principle

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Question

In an interference pattern, at a point we observe the 16 th order maximum for λ 1 = 6000A. What order will be visible here if the source is replaced by light of wavelength? λ 2 = 4800 Å

Choices

Choice (4) Response

a.

10

b.

20

c.

40

d.

80

Question number: 1228

» Wave Optics » Polarization

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Question

Two Polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of 30 0 with each other. What fraction of incident unpolarised light is transmitted?

Choices

Choice (4) Response

a.

17.5 %

b.

27.5 %

c.

37.5 %

d.

57.5 %

Question number: 1229

» Properties of Solids & Liquids » Elastic Behavior

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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: 1230

» Wave Optics » Polarization

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Question

Out of the following statements which are correct?

(1) Nicol prism works on the principle of double refraction and total internal reflection

(2) Nicol prism can be used to produce and analyses polarised light

(3) Calcite and Quartz are both doubly refracting crystals

(4) When unpolarised light passes through a Nicol prism, the emergent light is elliptically polarized

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1,2 and 3 are correct

d.

1 and 2 are correct