Question # 1

A wave source of frequency 1,000 Hz emits waves of wavelength 0.1 m How long does it take for the waves to travel 2500 m.

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4 s

25 s

40 s

100 s

The quality of sound

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Decreases with pitch

Varies directly as its pitch

Varies inversely as its pitch

Depends upon the overtones present there

Ultrasonic sound waves

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Can be heard by a normal human ear

Can be heard with the help of hearing apparatus

Can be heard with the help of microphone

cannot be heard

LASER is a device which can produce

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Monochromatic beam of light

Coherent beam of light

An intense beam of lgiht

All of these

Mostly widely used types of gas LASER are.

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Neon

Argon ion

Helium

All of these

The speed of bodies exceeding the speed of sound is called.

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Superesonic

Ultrasonic

Infrasonic

Super fast

X-rays eject electrons from matter by

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Pair production

Pair annihilation

Compton effect

Photoelectric effect

The perceived fundamental frequency of a sound is called.

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Pitch

Timber

Loudness

Wavelength

When light enters glass from air it suffers a change in.

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Wavelength

Wave front

Velocity

All of these

Maximum number of orders available with a grating is.

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Independent of grating element

Directly proportional to grating element

Inversely proportional to grating element

Directly proportional to wavelength

A bat while flying determines the location and nature of object in his way by sending.

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Infrasonic waves

Ultrasonic waves

Supersonic waves

Ultraviolet waves

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

Beats occur due to

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Reflection

Refraction

interference

Diffraction

On average there is no energy transfer in.

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Sound waves

Water waves

Standing waves

Mechanical waves

Plane polarized light can be produced by

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Reflection

Refraction

Scattering of light

All of these

The quality of a note

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Decreases with loudness

Varies directly as its pitch

Varies inversely as its pitch

Depends upon the overtones

LASER is a device for

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Producing a beam of white light

Producing a beam of monochromatic and coherent light

Producing a beam of high intensity incoherent light.

Producing highly penetrating's X -rays

Which property of waves is independent of the others.

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Amplitude

Velocity

Frequency

Wavelength

Light product by a single Nicole is

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Unpolarized

Plane polarized

Circulatory polarized

Elliptically polarized

The velocity of sound will be greater in.

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Air

Water

Solids

Vacuum

Waves transfer

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Frequency

Velocity

Energy

Wavelength

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