Question # 1

When a ray of light enters from rarer medium to a denser medium its wavelength.

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Increases

Decreases

Remain constant

Vanishes

Which of the following gives discrete emission spectrum.

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Sun

Candle

Incandescent filament

Mercury vapour lamp

Infrared radiation is also known as

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Radio signals

Heat radiation

Magnetic resonance waves

RADAR

Which characteristics successively increases in the musical scale.

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Pitch

Quality

Loudness

Amplitude

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

When two waves travelling through the same medium arrive at the same point 180 ^o out of phase, they give rise to.

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Polarization

Destructive interference

Refraction

Constructive interference

Which of the following characteristics of a wave is independent of the others.

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speed

Frequency

Amplitude

Wavelength

Beats occur due to

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Reflection

Refraction

interference

Diffraction

Which of the following forms of electromagnetic energy has the longest wavelength.

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Microwaves

Radio waves

Infrared waves

^{Visible light}

The polarization of an electromagnetic wave is determined by

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The magnetic field

The electric field

The electric and magnetic fields

The field direction of propagation of electromagnetic waves

The locus of all points in the same state of vibrations are known as.

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half period zone

A wavefront

A half wave zone

A full wave zone

Velocity of sound in any medium deepness upon.

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Elasticity

Density

Volume

Mass

The interference between two sounds of slightly differed frequency is

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shock wave

Beats

Sonic boom

Doppler's effect

A pulse on the string is inverted when it is reflected from

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Free end

Fixed end

Either of the two

Rubber cord

The amplitude of sound wave determines its

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Pitch

Loudness

Reverberation

Interference

When the source and observer are moving away from each other the apparent pitch will

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Increases

Decreases

Be zero

Be infinite

Sounds of frequencies higher than 20,000 Hz are called.

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

Beats are the result of.

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Interference

Doppler's effect

Ultrasound

Polarization

A wave that remains in a constant position is called.

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Standing wave

Transvers wave

Shock wave

Longitudinal wave

Electromagnetic waves are produced by

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Charge at rest

Accelerated changes

Heating a conductor

Electroplating

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

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