Properties of Solids & Liquids (NEET Physics): Questions 126 - 130 of 188

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Question number: 126

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

A copper rod 5 m long is stretched by 1 mm. Strain will be -

Choices

Choice (4) Response

a.

2 × 10 -4, longitudinal

b.

1.2 × 10 -4, volumetric

c.

2.4 × 10 -4, longitudinal

d.

1 × 10 -3, volumetric

Question number: 127

» Properties of Solids & Liquids » Surface Energy and Surface Tension

MCQ▾

Question

When a body falls in air, the resistance of air depends to a rat extent on the shape of the body, 3 different shapes (1.5 cm cube, 2.3 cm cube and 3.1 cm cube). Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).

Choices

Choice (4) Response

a.

3 < 2 < 1

b.

2 < 3 < 1

c.

3 < 1 < 2

d.

1 < 2 < 3

Question number: 128

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

Is longitudinal strain and Y its young’s modulus of elasticity then potential energy per unit volume will be

Choices

Choice (4) Response

a.

12Y2S

b.

12Y2S2

c.

12YS2

d.

2YS2

Question number: 129

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A steel wire of uniform cross-sectional area 2 mm 2 is heated up to 50°C and clamped rigidly at two ends. If the temperature of wire falls to 30° then change in tension in the wire will be, if coefficient of linear expansion of steel is 1.1 × 10 -5 °C -1 and young’s modulus of elasticity of steel is 2 × 10 -6 N/m 2.

Choices

Choice (4) Response

a.

44 N

b.

22 N

c.

132 N

d.

88 N

Question number: 130

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

The rate of loss of heat from a body cooling under conditions of forced convection is proportional to its

(1) Surface area

(2) Excess of temperature over that of surrounding

(3) Heat capacity

(4) Absolute temperature

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1, 2 and 3 are correct

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