NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1439 - 1442 of 2320

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Question number: 1439

» Properties of Solids & Liquids » Heat Transfer » Conduction

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Question

Three rods of the same dimension have thermal conductivities 3K, 2K and K. 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

Three Rod of Same Dimension

Choices

Choice (4)Response

a.

60°C

b.

35°C

c.

50°C

d.

70°C

Question number: 1440

» Properties of Solids & Liquids » Thermal Expansion

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Question

Flask is filled up to a mark with 40 cc of mercury at 20°C. If the flask and contents are heated to 30°C, how much mercury will be above the mark? (α for glass is 9 × 10 -6 /°C and coefficient of real expansion of mercury is 180 × 10 -6 /°C

Choices

Choice (4)Response

a.

0.0005

b.

0.8500 cc

c.

0.0153 cc

d.

0.0708 cc

Question number: 1441

» Properties of Solids & Liquids » Thermal Expansion

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Question

The coefficient of volumetric expansion of mercury is 18 × 10 -5 / o C. A thermometer bulb has a volume 10 -6 m 3 and cross section of stem is 0.004 cm 2. Assuming that bulb is filled with mercury at 0°C then the length of the mercury column at 100°C is

Choices

Choice (4)Response

a.

4.5 cm

b.

18.8 mm

c.

7.4 cm

d.

9.2 mm

Question number: 1442

» Thermodynamics » Concept of Temperature

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Question

One mole of an ideal gas at an initial temperature of does 6 R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is , the final temperature of gas will be

Choices

Choice (4)Response

a.

b.

c.

d.

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