NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1265 - 1268 of 2184

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Question number: 1265

» Properties of Solids & Liquids » Thermal Expansion

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MCQ▾

Question

Density of a substance at 0°C is 10 gm/cc and at 100°C, its density is 7.7 gm/cc. The coefficient of linear expansion of the substance will be

Choices

Choice (4) Response

a.

10 2

b.

10 -3

c.

10 -2

d.

10 -4

Question number: 1266

» Properties of Solids & Liquids » Heat Transfer » Convection

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MCQ▾

Question

A cane is taken out from a refrigerator at 0°C. The atmospheric temperature is 25°C. If t 1 is the time taken to heat from 0°C to 5°C and t 2 is the time taken from 10°C to 15°C, then the wrong statements are

(1) (2)

(3) There is no relation (4)

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

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

Question number: 1267

» Properties of Solids & Liquids » Elastic Behavior

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MCQ▾

Question

A steel wire of uniform cross-sectional area 4 mm 2 is heated up to 60° C and clamped rigidly at two ends. If the temperature of wire falls to 40° C then change in tension in the wire will be, if coefficient of linear expansion of steel is 1.1 x 10 -5 /°C and young’s modulus of elasticity of steel is 2 × 10 -6 N/m 2.

Choices

Choice (4) Response

a.

144 N

b.

188 N

c.

176 N

d.

132 N

Question number: 1268

» Atoms and Nuclei » Bohr Model

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MCQ▾

Question

In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy E 0 and the radius r 0 of the first orbit will be (a 0 is the Bohr radius)

Choices

Choice (4) Response

a.

b.

c.

d.