Question # 1

Electromagnetic waves are produced by

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Charge at rest

Accelerated changes

Heating a conductor

Electroplating

The perceived fundamental frequency of a sound is called.

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Pitch

Timber

Loudness

Wavelength

A fringe is a path of.

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Constant amplitude

Constant phase

Same wavelength

Constant frequency

The variation in the speed of sound with temperature is greater in.

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Gases

Metals

Liquids

Insulators

A large ripple tank with a vibrator working at a frequency of 30 Hz produce 25 complete waves in a distance of 50 cm. The velocity of the wave is.

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9.53 cm s-1

60 cm s-1

750 cm s-1

1500 cm s-1

The phase different between the particles vibrating's between two consecutive nodes is.

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0

Lamda /2

2

2 lamda

The addition of two or more waves is termed as

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Interferences

Period

Echo

Polarization

The wavelength is the distance along the line of wave propagation between two successive particles which have equal

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Velocities

Phases

Amplitude

Displacements

Sound wave in air are

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Longitudinal waves

Transvers waves

Electromagnetic waves

Matter waves

Wave length of a LASER can be sued as a standard of.

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Angle

Time

Length

Temperature

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

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Wavelength

Wave front

Velocity

All of these

Polarization is characteristic of.

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Light wave

sound waves

Waver waves

x-rays

What is shapes of a pure note

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Sinwave

Sawtooth

Square wave

Triangular wave

Light wave can be polarized because they

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Are transverse in nature

Can be reflected

Have short wavelength

Have high frequncies

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

Two waves which combine to produce a resultant by reinforcing each other of every point demonstrate.

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Destructive interference

constructive interference

Refraction

polarization

If a rope in a hand makes 10 oscillations after every 2 s. the frequency of the wave is.

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2 C s-1

5 C s-1

10 C s-1

20 C s-1

Which of the following is an example of continuous spectra.

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Black body radiation spectrum

Molecular spectra

Atomic spectra

grating spectrum

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

A radiation spectrum which is continuously distributed over a frequency region without being broken up into lines or bands is known as.

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Continuous spectrum

Band spectrum

discrete spectra

Absorption spectrum

Light waves can be polarized because they

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have short wavelength

Have high frequency

Can be reflected

Are transverse

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