Question # 1

A cork moes at 5 m s-1 on the crest of a wave The distance between the crests is 10 m. The frequency of the wave motion is.

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0.5 Hz

1.0 Hz

2.0 Hz

5.0 Hz

Which of the following are examples of transverse and a longitudinal wave.

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Radio and sound waves

Radio and light waves

Light and water ripples

Light and sound waves

Light waves can be polarized because they

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have short wavelength

Have high frequency

Can be reflected

Are transverse

In which of the following the speed of sound will be maximum under similar conditions.

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N2

O2

CO2

H2

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

Blue colour of sky is due to.

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Diffraction

Reflection

Polarization

Scattering

The phase velocity is the velocity of a point that moves with a wave at constant phase it is also called.

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Phase speed

Wave speed

Wave velocity

All of these

X-rays can cause

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Malaria

Dysentery

Cancer

Blood pressure

Mostly widely used types of gas LASER are.

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Neon

Argon ion

Helium

All of these

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

The velocity of the wave could be increased by

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Reducing the amplitude

Decreasing the frequency

Increasing the period

Stretching the spring more

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

The amplitude of sound wave determines its

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Pitch

Loudness

Reverberation

Interference

A wave source of frequency 1000 Hz emits waves of wavelength 0.1 m How long does is take for the waves to travel 2500 m.

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20 s

25 s

40 s

100 s

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

It is possible is distinguish between transvers and longitudinal waves from the property of.

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Refraction

Interference

Diffraction

Polarization

Which type of oscillations produce resoncance.

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Free

Forced

Damped

All of these

When wind blows in the same direction in which the sound travels, the sound velocity

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Decreases

Increases

Remains unchanged

Becomes zero

Hearing damage is possible at sound pressure of

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0 dB

50 dB

130 dB

195 dB

The maximum displacement from the undisturbed position of the medium to the crest top is called.

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Wavelength

Amplitude

Period

Frequency

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

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

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