Question # 1

When sound waves travel from air to water which of these remains constant?

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Velocity

Frequency

Wavelength

All the above

A wave, which transfer energy by moving away from the source of disturbance is called a

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progressive wave

travelling wave

both of them

none of them

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

Which of the following changes at an antinode in a stationary wave?

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Density only

Pressure only

Both pressure and density

Neither pressure nor density

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

Which one of the following wave motions is transverse:

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Wave motion produced in water when a piece of stone is thrown into it

Pulling of weight hanging vertically with a spiral spring

Both of these

None of these

The vibratory or oscillatory motion of a body is

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translatory motion

back and forth motion about its mean position

free all motion

circular motion

The waves which propagate out in the space due to oscillations of electric and magnetic fields are called:

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Mechanical waves

Electromagnetic waves

Matter waves

All of them

The waves in which the particles of the medium have displacement along the direction of propagation of waves are called

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longitudinal waves

transverse waves

non-mechanical waves

none of them

A simple pendulum consists of a

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small light bob

small heavy bob

big light bob

big heavy bob

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

The time period of pendulums of different lengths would be

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same

different

both of them

none of them

When the bob of simple pendulum is at mean position, its K.E will be

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maximum

minimum

zero

all of them

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ECAT Physics Chapter 8 Waves Online Test MCQs With Answers

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