Question # 1

Stationary waves are produced when two identical waves are moving on the string.

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Along the same direction

Along the opposite direction

Along the perpendicular direction

Of length 1 m

In a diffraction pattern, the width of any fringe is.

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Directly proportional to slit width

Inversely proportional to slit width

independent of slit width

Zero

The phenomenon of polarization is done by

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Selective absorption

Scattering of light

Refraction of light

Dispersion of light

Polarization of light shows that light is.

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Corpuscular in nature

Of extremely short waves

Longitudinal waves

Transverse waves

Light of passing through a polaroid is

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Plane polarized

Unpolarized

Circularly polarized

Elliptically polarized

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

The pitch of sound depends on its

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Wavelength

Frequency

Wave amplitude

Harmonic content

Huygen's concept of secondary waves.

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Allow us to find the focal length of a thick lens

Is a geometrical method to find a wave front.

Is used to determine the velocity of light

Is used to explain polarization

Interference through thin films depends upon

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Thickness of thin film

Nature of material of thin film

angle of incident light

All of the above

The wavelength of Pascha series lies is the

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Visible region

Ultraviolet region

Infrared region

Invisible region

A water wave is an example of.

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Transverse wave

Longitudinal wave

Hair wave

Shock wave

Ultra sonics are the

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Frequencies in the audible range

Frequencies greater than 20 Hz

Frequencies greater than 20 KHz

Frequency lower than 20 KHz

If a wave vibrate 10 times in 1 s with a speed of 10 m s-1 the correct wavelength of the wave is.

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1 m

10 m

20 m

100 m

Good acoustic implies

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Obtaining as much reverberations as possible

Making the reverberation as small as possible

Obtaining the optimum of reverberations

Eliminating reverberations

A wave reflected from the boundary of a denser medium will have phase change

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45 ^o

60^o

90 ^o

180 ^o

The length of piano wire is 1 m and mass is 20 g and it is stretched by a fore of 200 N the fundamental frequency of sound waves produced by the piano will be

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50 Hz

100 Hz

150 HZ

250 Hz

If in Young's double slit experiments the separation between two slits is halved then the fringe width

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Remains unchanged

Becomes double

Reduces to half

Becomes 3 times

Which of the following devices can be used to produce both transvers and longitudinal waves.

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A string

A ripple tank

a helical spring

A turning fork

A disturbance that travels through space and time usually accompanied by energy transfer is called.

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sound

Wave

Echo

Frequency

In vacuum all electromagnetic waves have the same.

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Frequency

Amplitude

Speed

Wavelength

The phenomenon of interference occurs because waves obey

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Laws of reflection

Principle of super position

Laws of motion

Inverse square law of intensities

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