Properties of Solids & Liquids (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 131 - 135 of 190

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Question number: 131

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A uniform steel wire of density 7500 kg/m 3 is 2.5 m long and weighs 15.6 x 10 -3 kg. It extends by 1.25 mm when loaded by 10 kg. Calculate the value of young’s modulus of elasticity for steel.

Choices

Choice (4) Response

a.

2.3 × 10 11 N/m 2

b.

2.96 × 10 11 N/m 2

c.

19.6 × 10 11 N/m 2

d.

None of the above

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Passage

Read the passage given below and answer the questions that follow:

A bar of cross section A is subjected to equal and opposite tensile forces F at its ends. Consider a plane through the bar making an angle θ with a plane at right angles to the bar as shown in figure.

Question number: 132 (1 of 2 Based on Passage) Show Passage

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

The shearing stress at the plane, in terms of F, A and θ is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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Question number: 133 (2 of 2 Based on Passage) Show Passage

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

In the above problem, for what value of θ is the tensile stress maximum?

Choices

Choice (4) Response

a.

90°

b.

45°

c.

30°

d.

Zero

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Question number: 134

» Properties of Solids & Liquids » Temperature

MCQ▾

Question

50 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.

5°C

b.

8°C

c.

7°C

d.

6°C

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Question number: 135

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A black body is at a temperature of 2550 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U 1 between 999 nm and 1000 nm is U 2 and between 1499 nm and 1500 nm is U 3. The Wein’s constant b = 2.88 × 10 6 nm K. Then

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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