Question # 1

The rate of change of momentum is equal to

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Impulse

Torque

Velocity

Force

The produce oscillation, body is pulled away from its

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Mean position

Extreme position

Both a and b

None of these

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

In which medium the speed of sound is greater.

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Oxygen

Air

Water

copper

A set of frequencies which are multiples of the fundamental frequency are called.

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

One complete round trip of a vibrating body is called.

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Frequency

Time period

Vibration

Amplitude

The commercial unit of electric energy is

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Kilo watt hour

watt

Watt hour

Kilo Watt

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

Mercury is used as a thermometric substance because

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It is opaque

Does not stick to glass

Has low specific heat

All of these

The optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

The direction of angular velocity of along the

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Tangent at that point

Axis of rotation

Radius towards the centre

Radius away from the centre

Sound waves can not be

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Reflected

Refracted

Polarized

Diffracted

The dimensions of work are.

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[MLT-1]

[MLT-2]

[ML2T-2]

[MLT]

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

If the slope of the velocity time graph remain constant then body is moving with.

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Uniform velocity

Negative variable acceleration

Variable acceleration

Uniform acceleration

The velocity of a projectile is maximum

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At the highest point

At point of launching and just before striking the ground

At half of the height

After striking the ground

An elevator is moving up with an acceleration equal to 'g' An apparent weight of the body in an elevator is.

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Zero

Equal to real weight

2 mg

3 mg

Pi radian is equal to.

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0^o

90^o

180^o

57.3^o

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