Question # 1

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

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Superesonic

Ultrasonic

Infrasonic

Super fast

Which are different types of emission spectrum

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Continues spectrum

Line spectrum

Band spectrum

all of the above

The unit of intensity of sound waves is.

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W m-1

W m-2

N m-1

N m-2

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

Which of the following gives discrete emission spectrum.

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Sun

Candle

Incandescent filament

Mercury vapour lamp

Beats occur due to

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Reflection

Refraction

interference

Diffraction

The same notes being played on sitar and veena differ in.

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Pitch

Quality

Both quality and pitch

Neither quality nor pitch

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

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Amplitude

Intensity

Frequency

Wavelength

Two light waves which are not coherent cannot produce.

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Interference

Diffraction

Reflection

Dispersion

The ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

The pitch of sound a determined by its

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Speed

Frequency

Direction

Number of beats

X-rays can cause

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Malaria

Dysentery

Cancer

Blood pressure

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 is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

Huygen's wave theory falls to explain

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Diffraction

polarization

Interference

Refraction

Monochromatic ight is of single.

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Frequency

Wave length

Amplitude

Pitch

Beats occurs because of.

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Reflection

Refraction

Interference

Doppler's effect

The heat frequency is the

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Sum of the two frequenceis

Produce of the two frequency

Difference of the two frequencies

Ratio of the two frequencies

The light rays which combine destructively would mean that resultant

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Intensity increases

Intensity decreases

Amplitude increases

Amplitude decreases

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

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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