Properties of Solids & Liquids-Heat Transfer (NEET Physics): Questions 1 - 4 of 40

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Question number: 1

» Properties of Solids & Liquids » Heat Transfer » Convection

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 36°C. Then the difference of temperature at the two surfaces of A will be

Choices

Choice (4) Response

a.

12°C

b.

24°C

c.

6°C

d.

18°C

Question number: 2

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that

Choices

Choice (4) Response

a.

It is easier and more convenient to do so

b.

Convection may be stopped

c.

Heat conduction is easier downwards

d.

Radiation may be stopped

Question number: 3

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Four rods of identical cross-sectional area and made from the same metal form the sides of square. The temperature of two diagonally opposite points are T and √2T respectively in the steady state. Assuming that only heat conduction takes place, what will be the temperature difference between other two points

Choices

Choice (4) Response

a.

Equation

b.

0

c.

Equation

d.

All of the above

Question number: 4

» Properties of Solids & Liquids » Heat Transfer » Radiation

Assertion-Reason▾

Assertion (Ꭺ)

The absorbance of a perfect black body is unity.

Reason (Ꭱ)

A perfect black body when heated emits radiations of all possible wavelengths at that temperature.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

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