Question # 1

If a body of mass 5 kg is raised vertically through a distance of 1 m, then work done is.

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49 J

4.9 J

490 J

0.49 J

Which remains constant in an adiabatic process.

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Volume

Pressure

entropy

temperature

The profile of periodic waves generated by a source executing S.H.M is represented by a.

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Circle

Sine curve

Tangent curve

Cosine curve

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

Almost all the raw energy is librated from

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Heat

Earth

Light

All of these

Angular velocity determines, How fast or, How slow a body is

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Accelerating

Vibrating

Rotating

Oscillating

If the pressure of a gas is doubled, then speed of sound is.

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Doubled

Become half

Not affected

Increases by four times

The speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

The SI unit of power is

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Joule

Newton

Watt

Kilowatt

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The power needed to lift a mass of 5000 g to height of 1 m in 2 secnd is

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2.45 watt

24.5 watt

245 watt

2.45 watt

Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

When one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes and observed, The wavelength of light used is.

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5000 m

50000 A^o

500 cm

2000 A^o

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

The basics quantity among the following is

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Mass

Torque

Force

Velocity

The difference between tow molar capacities is equal to.

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Plank's constant

General gas equation

Molar gas constant

Boltzmann constant

Pi radian is equal to.

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0^o

90^o

180^o

57.3^o

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