NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1374 - 1378 of 2320

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Question number: 1374

» Wave Optics » Polarization

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Question

When an unpolarised light of intensity I 0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

Choices

Choice (4)Response

a.

b.

Zero.

c.

d.

Question number: 1375

» Properties of Solids & Liquids » Latent Heat

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Question

A stationary object at 4°C and weighing 5.5 kg falls from a height of 6000 m on a snow mountain at 0°C. If the temperature of the object just before hitting the snow is 0°C and the object comes to rest immediately? (g = 10m/s 2 and latent heat of ice = 3.5 × 10 5 joule/sec), then the object will melt

Choices

Choice (4)Response

a.

2 kg of ice

b.

200 kg of ice

c.

0.9438 kg of ice

d.

2.346 gm of ice

Question number: 1376

» Properties of Solids & Liquids » Newton's Law of Cooling

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MCQ▾

Question

A body initially at 80° C cools to 64° C in 5 minutes and to 52° C in 10 minutes. The temperature of the body after 15 minutes will be

Choices

Choice (4)Response

a.

47°

b.

35° C

c.

42.7° C

d.

40° C

Question number: 1377

» Properties of Solids & Liquids » Elastic Behavior

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Question

The lengths and radii of two wires of same material are respectively L, 2L, and 2R, R. Equal weights are applied on then. If the elongations produced in them are l 1 and l 2 respectively then their ratio will be

Choices

Choice (4)Response

a.

8: 1

b.

2: 1

c.

4: 1

d.

1: 8

Question number: 1378

» Properties of Solids & Liquids » Heat Transfer » Conduction

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MCQ▾

Question

A 5 cm thick ice block is there on the surface of water in a lake. The temperature of air is - 10° C; how much time it will take to double the thickness of the block (L = 80 cal/g, K ice = 0.004 erg/s-k, d ice = 0.92 g cm -3)

Choices

Choice (4)Response

a.

191 hours

b.

1 hour

c.

1.91 hours

d.

19.1 hours

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