Question # 1

When two waves with same frequency and constant phase difference phase difference interfere

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There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

The restoring force always directed towards the

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extreme position

mean position

both of them

none of them

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

The wave form of S.H.M will be

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square wave

sine wave

rectified wave

saw-tooth wave

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

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

A body is executing free vibrations when it oscilates

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with the interference of an external force

without the interference of an external force

with the interference of an internal force

none of them

Example of vibratory motion is

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mass suspended from a spring

a bob of simple pendulum

mass attached to a spring placed

all of them

Progressive waves of frequency 300 Hz are superimposed in produced a system of stationary waves in which adjacent nodes are 1.5 m apart. What is the speed of the progressive waves?

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100 ms^-1

200 ms^-1

450 ms^-1

900 ms^-1

For a body executing S. H. M, its

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momentum remains constant

potential energy remains constant

kinetic energy remains constant

total energy remains constant

Which of the following is an example of a S.H.M?

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motion of a projectile

motion of a train along a circular path

motion of swing

electrons revolving sound the nucleus

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

The waves which propagate by the collision of material particles are known as

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e.m. waves

mechanical waves

light waves

microwaves

A heavily damped system has a fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

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

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resonance

force oscillations

large oscillations

damped oscillations

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

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

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

The characteristic of a body executing S.H.M is that its acceleration is

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inversely proportional to displacement

directly proportional to displacement

independent of displacement

equal to zero

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

When a body is performing S.H.M., its acceleration is

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inversely proportional to the displacement

directly proportional to the applied force

directly proportional to the amplitude

directly proportional to the displacement but in opposite direction

Which one of the following is an example of resonance

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swing

tuning a radio

microwave oven

all of them

When temperature increase, the frequency of a tuning fork

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Increases

Decreases

Remains same

Increase or decreases depending on the material

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

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frequency

amplitude

displacement

time period

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

Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as

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waves

beat

interference

resonance

If F=0.04 N and X=4 cm then K=

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1 Nm^-1

2 Nm^-1

3 Nm^-1

4 Nm^-1

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

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