Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 46 - 49 of 190

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Question number: 46

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

A composite metal bar of uniform section is made up of length 15 cm of copper, 10 cm of nickel and 5 cm of aluminum. Each part being in perfect thermal contact with the adjoining part. The copper end of the composite rod is maintained at 100°C and the aluminum end at 0°C. The whole rod is covered with belt so that there is no heat loss occurs at the sides. If K Cu = 2K al and K a1 = 3K Ni, then what will be the temperatures of Cu - Ni and Ni - Al junctions respectively,

Choices

Choice (4) Response

a.

30°C and 50°C

b.

50°C and 30°C

c.

23.33°C and 78.8°C

d.

83.33°C and 20°C

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Question number: 47

» Properties of Solids & Liquids » Terminal Velocity

MCQ▾

Question

An incompressible liquid flows through a horizontal tube as shown in trite following fig. Then the velocity v of the fluid is

Choices

Choice (4) Response

a.

1.5 m/s

b.

1.0 m/s

c.

3.0 m/s

d.

2.25 m/s

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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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