NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1278 - 1281 of 2320

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Question number: 1278

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MCQ▾

Question

A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from 0°C to 100°C. Another rod of a different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the other of metal B. This rod expands by 0.060 cm for the same change in temperature. The portion made of metal A has the length

Choices

Choice (4)Response

a.

10 cm

b.

15 cm

c.

18 cm

d.

20 cm

Question number: 1279

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Question

The compressibility of water is 5 × 10 -10 m 2 /N. If it is subjected to a pressure of 20 MPa the fractional decrease in volume will be -

Choices

Choice (4)Response

a.

5.0 × 10 -3

b.

1.5 × 10 -2

c.

7.5 ×10 -3

d.

3.3 × 10 -5

Question number: 1280

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Question

In Young’s double slit experiment 10th order maximum is obtained at the point of observation in the interference pattern for λ = 7000 Å. If the source is replaced by another one of wavelength 5000 Å then the order of maximum at the same point will be-

Choices

Choice (4)Response

a.

16th

b.

14th

c.

12th

d.

18th

Question number: 1281

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MCQ▾

Question

Density of a substance at 0°C is 10 gm/cc and at 100°C, its density is 9.7 gm/cc. The coefficient of linear expansion of the substance will be

Choices

Choice (4)Response

a.

10 2

b.

10 -2

c.

10 -4

d.

10 -3

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