The equation of a simple harmonic motion is X = 0.34 cos (3000 t

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

The rms speed of the molecules of a gas in a vessel is 400 ms. If half of the gas leaks out, at constant temperature, the rms speed of the remaining molecules will be

  • 800 ms-1

  • 4002 ms-1

  • 400 ms-1

  • 200 ms-1


32.

An electron tube was sealed off during manufacture at a pressure of 1.2 x 10-7 mm of mercury at 27°C. Its volume is 100 cm3. The number of molecules that remain in the tube is

  • 2 × 1016

  • 3 × 1015

  • 3.86 × 1011

  • 5 × 1011


33.

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

  • flat

  • concave

  • convex

  • cylindrical


34.

A steel scale is to be prepared such that the millimetre intervals are to be accurate within 6 x 10-5 mm. The maximum temperature variation during the ruling of the millimetre marks is (α = 12 x 10-6/° C) 

  • 4.0° C

  • 4.5° C

  • 5.0° C

  • 3° C


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35.

A constant volume gas thermometer works on

  • Archimede's principle

  • Pascal's law

  • Boyle's law

  • Charle's law


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36.

The equation of a simple harmonic motion is X = 0.34 cos (3000 t + 0.74), where X and t are in mm and sec respectively. The frequency of the motion in Hz is

  • 3000

  • 30002π

  • 0.742π

  • 3000π


B.

30002π

Here, ω = 3000      f = 30002π Hz


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37.

The unit of specific conductivity is

  • Ω cm-1

  • Ω cm-2

  • Ω-1 cm-1

  • Ω cm-3


38.

If 96500 C of electricity liberates 1 g equivalent of any substance, the time taken for a current of 0.15A to deposit 20 mg of copper from a solution of copper sulphate is (chemical equivalent of copper = 32)

  • 5 min 20 s

  • 6 min 42 s

  • 4 min 40 s

  • 5 min 50 s


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39.

An electric motor operates on a 50 V supply and a current of 12 A. If the efficiency of the motor, is 30%, what is the resistance of the winding of the motor

  • 6 Ω

  • 4 Ω

  • 2.9 Ω

  • 3.1 Ω


40.

Two long straight wires are set parallel to each other. Each carries a current in the same direction and the separation between them is 2 r. The intensity of the magnetic field mid-way between them is

                   

  • μ0ir

  • 4μ0ir

  • Zero

  • μ0i4r


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