Question # 1

The wavelength is the distance along the line of wave propagation between two successive particles which have equal

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Velocities

Phases

Amplitude

Displacements

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

Beats are the results of.

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Diffraction of sound waves

Interference

Polarization

Timber

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

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speed

Frequency

Amplitude

Wavelength

The amplitude of a vibrating body at resonance place in vacuum is.

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zero

Maximum

Minimum

Infinite

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

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

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Amplitude

Intensity

Frequency

Wavelength

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 form of electromagnetic energy has the highest frequency.

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X rays

Game rays

Ultraviolet waves

Infrared waves

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

Echoes arise from

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Reflection

Refraction

Diffraction

Dispersion of sound waves

Which of the following is an example of continuous spectra.

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Black body radiation spectrum

Molecular spectra

Atomic spectra

grating spectrum

The velocity of sound will be greater in.

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Air

Water

Solids

Vacuum

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 penetrating power of X rays is least with materials of.

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High mass density

High volume density

High electron density

High weight

The main advantage of a grating over Young's apparatus is the

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Sharpness of the bright lines

Absence of dark fringes

Absence of bright fringes

Greater deviation of light

Blue colour of sky is due to.

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Diffraction

Reflection

Polarization

Scattering

Three tuning forks of frequencies 400 Hz. 401 Hz and 402 Hz are sounded together The frequency of beats per sound is.

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0

1

2

3

When a transverse wave is reflected on going from a more dense to a less dense medium.

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There is no phase shift

There is a 180 ^o phase shift

There is a phase shift of 360 ^o

A crest is transformed to a trough

Which effect explain the frequency shift that occurs when there is motion sound a listener or both relative to the medium.

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Early effect

Doppler's effect

Hall effect

Zeeman effect

Newton's rings are formed due to

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Diffraction of light

Interference of light

Polarization of light

Reflection of light

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PPSC Physics Chapter 5 Waves and Wave Properties of Light MCQs With Answers

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