# Properties of Solids & Liquids-Thermal Expansion (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 21 - 24 of 32

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## Passage

In a thermally insulated tube of cross sectional area 4 cm 2 a liquid of thermal expansion coefficient 10 -3 K -1 is flowing. Its velocity at the entrance is 0.1 m/s. At the middle of the tube a heater of a power of 10 kW is heating the liquid. The specific heat capacity of the liquid is 1.5 kJ/ (kg K), and its density is 1500 kg/m 3 at the entrance.

## Question number: 21 (3 of 3 Based on Passage) Show Passage

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

### Question

The rise in temperature of the liquid as it pass through the tube is

### Choices

Choice (4) Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

## Question number: 22

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

### Question

80 gm of copper is heated to increase its temperature 10°C. If the same quantity of heat is given to 10 gm water, the rise in its temperature is (Specific heat of copper = 420 Joule-kg -1 C -1)

### Choices

Choice (4) Response

a.

6°C

b.

8°C

c.

5°C

d.

7°C

## Question number: 23

» Properties of Solids & Liquids » Thermal Expansion

Assertion-Reason▾

### Assertion (Ꭺ)

A brass disc is just fitted in a hole in a steel plate. The system must be cooled to loosen the disc from the hole.

### Reason (Ꭱ)

The coefficient of linear expansion for brass is greater than the coefficient of linear expansion for steel.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is 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

## Question number: 24

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

### Question

A rod of length 20 cm is made of metal. It expands by 0.080 cm when its temperature is raised from 0°C to 100°C. Another rod of a different metal B having the same length expands by 0.040 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the other of metal B. This rod expands by 0.050 cm for the same change in temperature. The portion made of metal A has the length

### Choices

Choice (4) Response

a.

8 cm

b.

3 cm

c.

1 cm

d.

5 cm

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