Properties of Solids & Liquids (NEET Physics): Questions 83 - 86 of 188

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Question number: 83

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

Consider two hot bodies B 1 and B 2 which have temperature 100° C and 80° C respectively at t = 0. The temperature of surroundings is 40° 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 = 3: 2

b.

R 1: R 2 = 2: 3

c.

R 1: R 2 = 5: 4

d.

R 1: R 2 = 4: 5

Question number: 84

» Properties of Solids & Liquids » Thermal Expansion

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: 85

» Properties of Solids & Liquids » Modulus of Rigidity

MCQ▾

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.

7.5 ×10 -3

b.

5.0 × 10 -3

c.

1.5 × 10 -2

d.

3.3 × 10 -5

Question number: 86

» Properties of Solids & Liquids » Thermal Expansion

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 -3

c.

10 -4

d.

10 -2

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