Question # 1

A girl standing 150 m in front of tall building fires a pistol A boy standing 350 m behind her hears two bangs 1 s apart from this information what is the speed of sound in air.

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150 m s-1

300 m s-1

280 m s-1

330 m s-1

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

Hearing damage is possible at sound pressure of

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0 dB

50 dB

130 dB

195 dB

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

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Microwaves

Radio waves

Infrared waves

^{Visible light}

Which of the following represents an elastic wave.

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Light waves

Radiowaves

X-rays

Sound 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

A wave that remains in a constant position is called.

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Standing wave

Transvers wave

Shock wave

Longitudinal wave

Diffraction is a special type of.

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Polarization

Interference

Dispersion

Scattering

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 note of the lowest frequency is called

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beat

Overtone

Fundamental note

Harmonic note

When stationary waves are formed in a closed organ pipe.

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A node is formed at the closed end of the pipe

An antinode is formed at the closed end of the pipe

Each particle at the node experience zero acceleration

The maximum pressure occurs at the nodes

The phenomenon of polarization is done by

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Selective absorption

Scattering of light

Refraction of light

Dispersion of light

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

Which instrument measures properties of light over a specific portion of the electromagnetic spectrum.

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Photometer

Spectrometer

Hydrometer

Lactometer

Sound of frequencies lower than 20 Hz are called.

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Supersonics

Infra sonics

Ultrasonic

Audible sound waves

Light from the sun reaches the earth in

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Spherical wave fronts

Cylindrical wave fronts

Plane wave fronts

Packets

Electromagnetic waves transmit.

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Energy only

Momentum only

Energy and momentum

Light

When amplitude of a wave becomes double its energy becomes.

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Xero

Double

4 times

6 times

The phenomenon of interference comes about because waves obey

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the impulse momentum theorem

An inverse square law of intensity

The principle of reciprocity

The principle of super position

The wavelength of Pascha series lies is the

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Visible region

Ultraviolet region

Infrared region

Invisible region

If the period of a wave motion is 2 s and the wave speed is 4 cm s-1 then its frequency is

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1/8 C s-1

1/2 C s-1

2 C s-1

8 C s-1

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