Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 76 - 79 of 190

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Question number: 76

» 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 7.7 gm/cc. The coefficient of linear expansion of the substance will be

Choices

Choice (4) Response

a.

10 2

b.

10 -2

c.

10 -3

d.

10 -4

Question number: 77

» Properties of Solids & Liquids » Heat Transfer » Convection

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.

2 and 4 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

Question number: 78

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A steel wire of uniform cross-sectional area 4 mm 2 is heated up to 60° C and clamped rigidly at two ends. If the temperature of wire falls to 40° C then change in tension in the wire will be, if coefficient of linear expansion of steel is 1.1 x 10 -5 /°C and young’s modulus of elasticity of steel is 2 × 10 -6 N/m 2.

Choices

Choice (4) Response

a.

176 N

b.

188 N

c.

144 N

d.

132 N

Question number: 79

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Three rods of the same dimension have thermal conductivities 4K, 2K and 2K. They are arranged as shown in fig. with their ends at 100°C, 50°C and 20°C. The temperature of their junction is

Three rod of same dimension 4K, 2K and 2K

Three Rod of Same Dimension 4K, 2K and 2K

In above fig show three rod of same dimension having thermal conductivities 4K, 2K and K.

Choices

Choice (4) Response

a.

67.5°C

b.

35.3°C

c.

70.45°C

d.

50.43°C

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