Properties of Solids & Liquids (NEET (NTA-National Eligibility cum Medical Entrance Test) Physics): Questions 140 - 144 of 190

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Question number: 140

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

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.

4: 1

b.

2: 1

c.

8: 1

d.

1: 8

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Question number: 141

» Properties of Solids & Liquids » Heat Transfer » Conduction

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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Question number: 142

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

MCQ▾

Question

Two soap bubbles of radii r 1 and r 2 equal to 8 cm and 9 cm are touching each other over a common surface S 1 S 2. Its radius will be

Choices

Choice (4) Response

a.

45 cm

b.

58 cm

c.

20 cm

d.

72 cm

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Question number: 143

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A brass rod is to support a load of 500 N. If its elastic limit is 5.0 × l0 8 N/m 2 its minimum diameter must be -

Choices

Choice (4) Response

a.

3.71mm

b.

1.13mm

c.

1.26mm

d.

2.26mm

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Question number: 144

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Consider two hot bodies B 1 and B 2 which have temperature 100° C and 60° C respectively at t = 0. The temperature of surroundings is 50° C. The ratio of the respective rates of cooling R 1 and R 2 of these two bodies at t = 0 will be

Choices

Choice (4) Response

a.

R 1: R 2 = 4: 5

b.

R 1: R 2 = 3: 2

c.

R 1: R 2 = 2: 3

d.

R 1: R 2 = 5: 1

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