Question # 1

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

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 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

A traveling wave has a shape of:

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Square wave

Sine wave

Parabola

hyperbola

The example of mechanical wave is

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waves in ropes

waves on water surface

waves in air

all of them

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

The waves produced in a microwave oven have frequency

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2450 Hz

2450 K Hz

2450 M Hz

2450 G Hz

At 'resonance' the transfer of energy from deriving source to the oscillator is

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maximum

minimum

zero

none of them

Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:

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Rope

Coil of spring

Water

All of them

The expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

Which of the following is the longitudinal waves?

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Sound waves

Waves on plucked string

Water waves

Light waves

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

An object undergoes S.H.M has maximum acceleration when its displacement form the means position

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maximum

zero

half of the maximum value

one third of the maximum value

The maximum displacement of a body on either side of its equilibrium position is called

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frequency

amplitude

displacement

time period

Acceleration of the mass at any instant is given by

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a=k/m x

a= - m/k x

a = - k/m x

a=m/k x

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

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