Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 173 - 176 of 190

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Question number: 173

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

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

In above figure it is shown that three rod of same dimension have thermal conductivities 3K, 2K and K.

Choices

Choice (4) Response

a.

70°C

b.

60°C

c.

50°C

d.

35°C

Question number: 174

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

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.

0.0708 cc

b.

0.0005

c.

0.8500 cc

d.

0.0153 cc

Question number: 175

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

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.

9.2 mm

b.

4.5 cm

c.

18.8 mm

d.

7.4 cm

Question number: 176

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

A glass flask of volume one liter at 0° C is filled, level full of mercury at this temperature. The flask and mercury are now heated to 100 0 C. How much mercury will spill out, if coefficient of volume expansion of mercury is 1.82 × 10 -4 /°C and linear expansion of glass is 0.1 × l0 -4 /ºC?

Choices

Choice (4) Response

a.

2.12 cc

b.

21.2 cc

c.

15.2 cc

d.

1.52 cc

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