Question # 1

Doppler's effect can be applied to.

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Light wave only

sound wave only

Both light waves and sound waves

Study various features of a wave

A negative acceleration does not necessaryimply.

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Decreasing speed

An increasing distance

An increasing speed

A decreasing distance

Which of the following quantities is zero about the centre of mass of body.

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Mass

acceleration

Moment

Angular acceleration

If the period of a wave motion is 2 s and the wave speed is 4 cm s-1 then its frequency is

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1/8 C s-1

1/2 C s-1

2 C s-1

8 C s-1

What will be the effect on the speed of a Transerv wave in a string. If tension is made 4 times.

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Remains the same

Increase a times

Becomes double

Becomes 3 times

Mean life of a radioactive sample is 100 s its half life will be

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0.693 s

1 s

6.93 s

69.3 s

Two tuning forks have same natural frequency One of them is now loaded with wax. When both the forks are sounded together the will

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Produce interference

Produce vibrations

Remain in resonance

Produce beats

A rocket propulsion is based on the principle of.

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Conservation of momentum

Conservation of mass

Conservation of energy

Floatation

The unit Planck's constant is equivalent to that of.

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Energy

Force

Velocity

Angular momentum

Minor losses through values, fittings, bends etc are modeled as proportional to

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Velocity head

Static head

total head

Pressure drop

A heat engine can develop efficiency equal to 100% if the temperature of the sink is

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Less than that of source

Equal to that of source

0 K

0 ^oC

The combined resistance of two identical resistors, connected in series is 18 Mega Their combined resistance in a parallel arrangement will be.

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2 Mega

4 Mega

8 Mega

12 Mega

Hygen's principle states that

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Light travels in straight line

Light travels in electromagetic waves

All points of primary wave front are source of secondary wavelets

Light has dual nature

In projectile motion, the body has

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One component of velocity

Two components of velocity

Three components of velocity

No component of velocity

Which one of the following is an example of a reversible process.

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Work done against friction

Heat produced by current

Melting of ice

See back effect

Michelson's interferometer can b e sued to find

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Velocity of light

Velocity of sound

Wavelength of light

Wavelength of sound

The permeability of air is

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0.5

zero

infinity

Unity

Net change in entropy of a system in a Carnot's cycle in

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Positive

Negative

Zero

Infinite

The phenomenon of natural radioactivity was discovered by

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Lord Rutherford

James Chadwick

Herie Becquerel

Maria curie

It is deduced that a piece of metal is already a magnet if

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A copper wire is attracted to it

A copper wire is repelled by it

One end of a compass is repelled by it

Both ends of a compass needle are attracted to it.

If the gas pressure is increased then its mean free path becomes.

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More

Zero

Infinite

Less

Radioactive decay series can be represents on

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Smith chart

Segre chart

Logarithmic chart

Carbon paper

Which of the following is used for the failure of a lens to form a sharp and distinct image.

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Distortion

Astrigmation

Chromatic aberration

spherical aberration

A sonometer or audiometer is a device based on the principle of.

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Resonance

Beats

Overtones

Harmonics

In an isobaric process there is no.

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Pressure change

Internal energy change

Heat exchanged

volume change or work done

A girl standing 150 m in front of tall building fires a pistol A boy standing 350 m behind her hears two bangs 1 s apart from this information what is the speed of sound in air.

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150 m s-1

300 m s-1

280 m s-1

330 m s-1

Intensity of the dark bands in interference pattern becomes zero when two waves.

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Of light are monochromatic

Are of the same frequency

Are of the same amplitude

Travel in opposite direction

The aberration in the image formed by a lens due to different wavelengths present in a source is called.

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Spherical aberration

Chromatic aberration

Astigmation

Achromatic aberration

How power factor of a circuit can be improved.

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Using capacitors

Using cokes

Using resistors

All of these

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

What is shapes of a pure note

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Sinwave

Sawtooth

Square wave

Triangular wave

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