NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1346 - 1350 of 2184

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Question number: 1346

» Properties of Solids & Liquids » Heat Transfer » Radiation

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MCQ▾

Question

The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if

Choices

Choice (4) Response

a.

Different volumes of the liquids at the same temperature are taken

b.

The masses of the liquids are equal

c.

Equal masses of the liquids at the same temperature are taken

d.

Equal volumes of the liquids at the same temperature are taken

Question number: 1347

» Properties of Solids & Liquids » Stress-Strain Relationship

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Question

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

Choices

Choice (4) Response

a.

1.2 × 10 -4, volumetric

b.

1 × 10 -3, volumetric

c.

2.4 × 10 -4, longitudinal

d.

2 × 10 -4, longitudinal

Question number: 1348

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

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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 < 1 < 2

b.

3 < 2 < 1

c.

1 < 2 < 3

d.

2 < 3 < 1

Question number: 1349

» Properties of Solids & Liquids » Young's Modulus

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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.

b.

c.

d.

Question number: 1350

» Properties of Solids & Liquids » Elastic Behavior

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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.

22 N

b.

44 N

c.

88 N

d.

132 N