Question # 1

A wave that remains in a constant position is called.

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Standing wave

Transvers wave

Shock wave

Longitudinal wave

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

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Gases

Metals

Liquids

Insulators

The light rays which combine destructively would mean that resultant

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Intensity increases

Intensity decreases

Amplitude increases

Amplitude decreases

Which of the following is an example band spectra.

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Black body radiation spectrum

Atomic spectra

Molecular spectra

Anomalous spectrum

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

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Superesonic

Ultrasonic

Infrasonic

Super fast

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

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

x-rays can cause fluorescence in materials such as

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Cadmium

Zinc sulphide

Palatinocyanide

All of these

The fundamental frequency of a sound source is 256 Hz. What is the frequency of the first harmonic.

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64

128

256

512

A stretched wire with clamped ends has a fundamental frequency of 1,000 Hz. What will be the new fundamental frequency if tension in the wire is increased by 2%

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980 Hz

1,000 Hz

1,010 Hz

1,020 Hz

Mostly widely used types of gas LASER are.

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Neon

Argon ion

Helium

All of these

If a wave vibrates 10 times in one second with a speed of 10 m s-1 the wavelength will be.

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1 m

10 m

20 m

100 m

When two identical travelling waves are superposed, velocity of the resultant wave

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Remains unchanged

Decreases

Increases

Become zero

Wave motion in air consist of

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Longitudinal waves

Transverse waves

Seismic waves

Polarized waves

On loading the prong of a tuning fork with wax. Its frequency.

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Increases

Decreases

Remain unchanged

May increase or decrease

What will be the effect on the speed of a Transerv wave in a string. If tension is made 4 times.

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Remains the same

Increase a times

Becomes double

Becomes 3 times

The unit of intensity level is.

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Watt

Joule

Bel

Sabin

A Spectrum of radiation in which the quantity being studied, such as frequency or energy takes on discrete values is called.

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Continuous spectra

Band spectra

Discrete spectra

Normal spectrum

The sound velocity in moist air as compared to dry air will be

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More

Less

Same

zero

A sound wave is an example of

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Transverse wave

longitudinal waves

Hair wave

Stationary wave

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