# NEET Physics: Questions 1335 - 1338 of 2142

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## Question number: 1335

MCQ▾

### Question

A brass rod is to support a load of 800 N. If it’s elastic limit is 8.0xl0 8 N/m 2 its minimum diameter must be -

### Choices

Choice (4) Response

a.

3.71 mm

b.

1.13 mm

c.

1.59 mm

d.

4.52 mm

## Question number: 1336

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: 1337

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

## Question number: 1338

MCQ▾

### Question

The temperature of equal masses of three different liquids A, B and C are 12 °C, 19 °C and 28°C respectively. The temperature when A and B are mixed is 26°C and who and C are mixed is 32 °C. The temperature when A and C are mixed is

### Choices

Choice (4) Response

a.

20.2°C

b.

22°C

c.

25.86°C

d.

18.2°C

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