Question # 1

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

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60°

90°

120°

180°

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

If a freely oscillating system is subjected to an external force, then

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free vibrations will take place

the body will move with its natural frequency

forced vibrations will take place

none of them

Of the following, the option ______ reminds of longitudinal waves.

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Sound waves

Heat waves

Electromagnetic waves

Light waves

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

The number of vibrating body at any instant from its equilibrium position is called

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displacement

frequency

amplitude

time period

Data transmitted along glass-fiber cables is in the form of pulses of monochromatic red light each of duration 2.5 ns. Which of the following is the best estimate of the number of wavelength in each pulse?

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10³

10⁶

10⁹

10¹²

Which of the following medium/media can transmit both transverse and longitudinal waves:

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Solids

Liquids

Gases

All of them

The restoring force always directed towards the

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extreme position

mean position

both of them

none of them

If a wave can be polarized, it must be

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An electromagnetic wave

A longitudinal wave

A progressive wave

A transverse wave

If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

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360 m/s

306 m/s

331 m/s

340 ms

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

Such oscillations in which the amplitude decreases steadily with time, are called

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resonance

force oscillations

large oscillations

damped oscillations

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

The process in which energy is dissipated from the oscillating system is known as

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resonance

interference

diffraction

damping

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Physics ECAT Pre Engineering Chapter 8 Waves Online Test MCQs With Answers

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