KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 126 - 129 of 250

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Question number: 126

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

Question

A long horizontal fixed wire carries a current of 15 A. A fine thin wire carrying a current 15 A and weighing 0.05 N/m is directly over it and parallel to it. The distance at which the second wire is just supported by the magnetic repulsion is –

Choices

Choice (4) Response

a.

9 m

b.

9×102cm

c.

101cm

d.

0.9 mm

Question number: 127

» Thermodynamics » Carnot Engine and Its Efficiency

MCQ▾

Question

A reversible engine converts 15th of the heat input into work. When the temperature of the sink is reduced by 750 C, the efficiency of the engine is doubled. The temperatures in degree centigrade of the source and the sink are –

Choices

Choice (4) Response

a.

102, 27

b.

95, 27

c.

100, 27

d.

112, 27

Question number: 128

» Wave Optics » Young's Double Slit Experiment

Appeared in Year: 2015

MCQ▾

Question

A beam of monoenergetic electros, which have been accelerated from rest by a potential U, is used to from an interference pattern in a Young’s Double Slit experiment. The electrons are now accelerated by potential 4U. Then the fringe width;

Choices

Choice (4) Response

a.

Remains the same.

b.

Is twice the original fringe width.

c.

Is half the original fringe width.

d.

Is one-fourth the original fringe width.

Question number: 129

» Thermodynamics » Thermodynamic Processes

MCQ▾

Question

1 g mole of an ideal gas at STP is subjected to a reversible adiabatic expansion to double its volume. Find the change in internal energy (γ=1.4) .

Choices

Choice (4) Response

a.

1169.5 J

b.

969.5 J

c.

1069.72 J

d.

849.28 J

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