NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1336 - 1339 of 2184

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Question number: 1336

» Properties of Solids & Liquids » Stress-Strain Relationship

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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.

1.59 mm

b.

3.71 mm

c.

1.13 mm

d.

4.52 mm

Question number: 1337

» Properties of Solids & Liquids » Thermal Expansion

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Assertion-Reason▾

Question

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 false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

Question number: 1338

» Properties of Solids & Liquids » Thermal Expansion

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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.

5 cm

b.

3 cm

c.

1 cm

d.

8 cm

Question number: 1339

» Properties of Solids & Liquids » Thermal Expansion

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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.

18.2°C

d.

25.86°C