Properties of Solids & Liquids (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 48 - 51 of 190

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Question number: 48

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A wire of cross sectional area 4mm 2 is just stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 20°C. Coefficient of linear expansion a = 10 -5 /°C and Y = 2 × 10 11 N/m 2.

Choices

Choice (4) Response

a.

220 N

b.

120 KN

c.

160 N

d.

120 N

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Question number: 49

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

A wall is made up of two layers A and B. The thickness of the two layers is the same, but materials are different. The thermal conductivity of A is double than that of B. In thermal equilibrium the temperature difference between the two ends is 30°C. Then the difference of temperature at the two surfaces of A will be

Choices

Choice (4) Response

a.

12°C

b.

10°C

c.

24°C

d.

18°C

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Question number: 50

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

MCQ▾

Question

A film of water is formed between two straight parallel wires of length 15 cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water = 70 × 10 -2 N/m)

Choices

Choice (4) Response

a.

2.16 × 10 -5 Joule

b.

1.44 × 10 -5 Joule

c.

7.22 × 10 -6 Joule

d.

5.76 × 10 -5 Joule

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Question number: 51

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The force required to separate two glass plates of area 3 ×10 -2 m -2 with a film of water 0.03 m thick between them, is (Surface tension of water is 70 × 10 -3 N/m)

Choices

Choice (4) Response

a.

280 N

b.

130 N

c.

140 N

d.

380 AT

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