Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 142 - 146 of 190

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Question number: 142

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

MCQ▾

Question

Two soap bubbles of radii r 1 and r 2 equal to 8 cm and 9 cm are touching each other over a common surface S 1 S 2. Its radius will be

Choices

Choice (4) Response

a.

45 cm

b.

58 cm

c.

20 cm

d.

72 cm

Question number: 143

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A brass rod is to support a load of 500 N. If its elastic limit is 5.0 × l0 8 N/m 2 its minimum diameter must be -

Choices

Choice (4) Response

a.

3.71mm

b.

1.13mm

c.

1.26mm

d.

2.26mm

Question number: 144

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Consider two hot bodies B 1 and B 2 which have temperature 100° C and 60° C respectively at t = 0. The temperature of surroundings is 50° C. The ratio of the respective rates of cooling R 1 and R 2 of these two bodies at t = 0 will be

Choices

Choice (4) Response

a.

R 1: R 2 = 4: 5

b.

R 1: R 2 = 3: 2

c.

R 1: R 2 = 2: 3

d.

R 1: R 2 = 5: 1

Question number: 145

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

An iron tire is to be fitted on to a wooden wheel 2 m in diameter. The diameter of tire is 4mm smaller than that of wheel. The tire should be heated so that its temperature increases by a minimum of (The coefficient of cubical expansion of iron is 3.6 ×10 -5 /°C)

Choices

Choice (4) Response

a.

1000°C

b.

500°C

c.

167°C

d.

334°C

Question number: 146

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

A composite metal bar of uniform section is made up of length 25 cm of copper, 10 cm of nickel and 15 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 = 2Kal and Ka1 = 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.

23.33°C and 78.8°C

c.

50°C and 30°C

d.

83.33°C and 20°C

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