Question # 1

Laser light is considered to be coherent because it consists of.

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Many wavelengths

Uncoordinated wavelengths

Coordinated waves of exactly the same wavelength

Divergent beams

Balimer series lies in the

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Visible region

Invisible region

Infrared region

Far infrared region

Which of the following properties of sound is affected by change in air temperature.

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Amplitude

Intensity

Frequency

Wavelength

Which technique uses underwater sound propagation to detect and locate submerged objects.

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RADAR

LIDAR

SONAR

LASER

The maximum energy of photons emitted from ab X rays tube is certain to be increased by

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Increasing the voltage across the tube

Decreasing the voltage across the tube

Heating the metal target

Putting a barrier in the way of photons

If Young's experiment is performed in water. which of the following change will occur.

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Fringe width will increases

Fringe width will decreases

Fringe width will remain unchanged

No fringe will be seen

Which of the following medium can transmit both transverse and longitudinal waves.

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Solid

Gas

Liquid

Plasma

Echoes arise from

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Reflection

Refraction

Diffraction

Dispersion of sound waves

Sound wave do not travel in vacuum because.

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they are transverse waves

They are stationary waves

They require material medium for propagation

They do not have enough energy

What will be the frequency it an employ vessel is filled with water.

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Increases

Decreases

Remain unchanged

Fundamental

The average amount of energy transported by a wave per unit area per unit time is termed as

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Wave speed

Wave intensity

Wavelength

Wave amplitude

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

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

The phenomenon of polarization is done by

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Selective absorption

Scattering of light

Refraction of light

Dispersion of light

To produce beats it is necessary to use two waves.

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Travelling in opposite direction

Of slightly different frequencies

Of equal wavelengths

Of equal amplitudes

The loudness of a sound deepness on its

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Wavelength

Frequency

Wave amplitude

Regularity

Which characteristics successively increases in the musical scale.

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Pitch

Quality

Loudness

Amplitude

In vacuum all electromagnetic waves have the same.

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Frequency

Amplitude

Speed

Wavelength

Which of the following form of electromagnetic energy has the highest frequency.

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X rays

Game rays

Ultraviolet waves

Infrared waves

Electromagnetic waves are produced by

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Charge at rest

Accelerated changes

Heating a conductor

Electroplating

The ripple tank is used to study various features of

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Wave phenomenon

Interferences

Doppler's effect

Reverberation

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