Properties of Solids & Liquids (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 78 - 81 of 190

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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

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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

Choices

Choice (4) Response

a.

67.5°C

b.

35.3°C

c.

70.45°C

d.

50.43°C

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Question number: 80

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

MCQ▾

Question

A solid sphere of density n ( > 1) times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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Question number: 81

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

3 kg of ice at - 20°C is mixed with 10 kg of water at 20°C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg/°C and 0.5 kcal/kg/°C while the latent heat of fusion of ice is 80 kcal/kg

Choices

Choice (4) Response

a.

15 kg

b.

12.125 kg

c.

47.5 kg

d.

6.435 kg

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