NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1267 - 1269 of 2320

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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.

Question number: 1269

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

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MCQ▾

Question

During the melting of a slab of ice at 273 K and one atmospheric pressure

(1) Positive work is done on the ice-water system by the atmosphere

(2) Positive work is done by ice-water system on the atmosphere

(3) The internal energy of the ice-water system increases

(4) The internal energy of the ice-water system decreases

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

Choices

Choice (4)Response

a.

1,2 and 3 are correct

b.

1 and 2 ate correct

c.

2 and 4 are correct

d.

1 and 3 are correct

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