Properties of Solids & Liquids (NEET 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

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

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

Solid sphere in water lighter than water

Solid Sphere in Water Lighter Than Water

Here in above fig we show that the sphere in water tank suspended by a string tied to its base.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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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