Question # 1

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

Shock absorber of the car is an example of

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resonance

forced oscillations

interference

damped oscillations

If one end of a rubber cord is fixed with a support and the other end is wiggled by hand, the waves generated on the card are:

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Stationary waves

Transverse waves

Both of these

None of these

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

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 time required to complete on vibration is called

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frequency

total time

time period

velocity

When half of the cycle of a body executing S.H.M is completed, then the phase of the vibration will be

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45°

90°

135°

180°

The waves which propagate out in space due to oscillation of electric and magnetic fields are known as

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e.m. waves

mechanical waves

sound waves

water waves

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

When an oscillatory motion repeats itself, then this type of motion is called

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vibratory motion

constant motion

fixed motion

periodic motion

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

One complete round trip of the body about its mean position is called

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displacement

vibration

a complete motion

an acceleration

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

In case of mechanical waves, we study the motion of

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a single particle

collection of particle

any one of them

none of them

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

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

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