NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1408 - 1412 of 2184

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Question number: 1408

» Properties of Solids & Liquids » Heat Transfer » Radiation

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MCQ▾

Question

A body cools from 90° 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.

42.85° C

b.

34.61° C

c.

56.40° C

d.

46.75° C

Question number: 1409

» Properties of Solids & Liquids » Specific Heat Capacity

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Question

A beaker contains 400 gm of water. The heat capacity the beaker is equal to that of 20 gm of water. The initial temperature of water in the beaker is 20°C. If 240 gm hot water at 92°C is poured in it, the final temperature (neglecting radiation loss) will be nearest to

Choices

Choice (4) Response

a.

46.18°C

b.

6.348°C

c.

12.58°C

d.

73.4°C

Question number: 1410

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

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Question

Radius of a capillary tube is 4 × 10 -3 m. A liquid of weight 5.20 × 10 -4 N may remain in the capillary tube then the surface tension of liquid will be

Choices

Choice (4) Response

a.

20 N/m

b.

2.0 × 10 -2 N/m

c.

2.3 × 10 -2 N/m

d.

20 × 10 -3 N/m

Question number: 1411

» Properties of Solids & Liquids » Heat Transfer » Convection

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Question

When fluids are heated from the bottom, convection currents are produced because

Choices

Choice (4) Response

a.

Heated fluid becomes more dense than the cold fluid above it

b.

Molecular collisions take place within the fluid

c.

Heated fluid becomes less dense than the cold fluid above it

d.

Molecular motion of fluid becomes aligned

Question number: 1412

» Properties of Solids & Liquids » Young's Modulus

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Question

For a given material, the Young’s modulus is 2.4 times that of rigidity modulus. Its Poisson’s ratio is

Choices

Choice (4) Response

a.

1.2

b.

0.2

c.

2

d.

1.02