Properties of Solids & Liquids [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 74 - 77 of 453

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Question 74

Question MCQ▾

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.

102

b.

10-3

c.

10-2

d.

10-4

Edit

Question 75

Question MCQ▾

A cane is taken out from a refrigerator at 0°C. The atmospheric temperature is 25°C. If t1 is the time taken to heat from 0°C to 5°C and t2 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.

1 and 2 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

Edit

Question 76

Question MCQ▾

A steel wire of uniform cross-sectional area 4 mm2 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 × 10-5 /°C and young՚s modulus of elasticity of steel is 2 × 10-6 N/m2 .

Choices

Choice (4)Response

a.

144 N

b.

188 N

c.

176 N

d.

132 N

Edit

Question 77

Question MCQ▾

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

Choices

Choice (4)Response

a.

70.45°C

b.

67.5°C

c.

35.3°C

d.

50.43°C

Edit