NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1262 - 1266 of 2320

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Question number: 1262

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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 = 2 × 10 11 N/m 2)

Choices

Choice (4)Response

a.

0.1 J

b.

5 J

c.

10 J

d.

250 J

Question number: 1263

» Properties of Solids & Liquids » Heat Transfer » Radiation

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MCQ▾

Question

A body cools from 60° C to 50° C in 10 minutes. If the room temperature is 25° C and assuming Newton ‘s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be

Choices

Choice (4)Response

a.

45° C

b.

40° C

c.

42.85° C

d.

38.5° C

Question number: 1264

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MCQ▾

Question

de-Broglie wavelength of an electron is 10 Å then velocity will be

Choices

Choice (4)Response

a.

7.2 × 10 4 m/s

b.

7.2 × 10 6 m/s

c.

7.2 × 10 5 m/s

d.

7.2 × 10 7 m/s

Question number: 1265

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MCQ▾

Question

Density of a substance at 0°C is 10 gm/cc and at 100°C, its density is 7.7 gm/cc. The coefficient of linear expansion of the substance will be

Choices

Choice (4)Response

a.

10 2

b.

10 -3

c.

10 -2

d.

10 -4

Question number: 1266

» Properties of Solids & Liquids » Heat Transfer » Convection

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MCQ▾

Question

A cane is taken out from a refrigerator at 0°C. The atmospheric temperature is 25°C. If t 1 is the time taken to heat from 0°C to 5°C and t 2 is the time taken from 10°C to 15°C, then the wrong statements are

(1) (2)

(3) There is no relation (4)

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

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

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