Properties of Solids & Liquids (NEET Physics): Questions 14 - 18 of 188

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Question number: 14

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A 4.0 m long copper wire of cross sectional area 1.5 cm 2 is stretched by a force of 4.8 × 10 3 N stress will be -

Choices

Choice (4) Response

a.

4.4 × l0 7 N/m 2

b.

5.0 × l0 7 KN/m 2

c.

3.2 × l0 7 N/m 2

d.

All of the above

Question number: 15

» 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.

22+1T

b.

0

c.

2+12T

d.

All of the above

Question number: 16

» 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

Question number: 17

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

A rod of length l and area of cross-section A is heated from 0°C to 100°C. The rod is so placed that it is not allowed to increase in length, then the force developed is proportional to

Choices

Choice (4) Response

a.

I -1

b.

A -1

c.

A

d.

I

Question number: 18

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

A bimetallic strip is heated. Choose wrong statements.

(1) Does not bend at all

(2) Gets twisted in the form of an helix

(3) Bends in the form of an arc with the more expandable metal inside.

(4) Bend in the form of an arc with the more expandable metal outside

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

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