Question # 1

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

Which of the following is the longitudinal waves?

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Sound waves

Waves on plucked string

Water waves

Light waves

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

There is no net transfer of energy by particle of medium in

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Longitudinal wave

Transverse wave

Progressive wave

Stationary wave

Two sound waves of slightly different frequencies propagating in the same direction produce beats due to

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Interference

Diffraction

Polarization

Refraction

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

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

Crests and troughs are formed in:

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Longitudinal 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

A second's pendulum is a pendulum whose time period is

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1 second

2 seconds

3 seconds

4 seconds

The example of mechanical wave is

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waves in ropes

waves on water surface

waves in air

all of them

The distance covered by the wave during one period is called its:

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Wave number

Frequency

Wavelength

Time period

Smaller the damping, the resonance will be

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more flat

more sharp

both of them

none of them

In the resonance condition, the amplitude of the oscillator becomes

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very large

very small

zero

any one of them

In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is

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Same

2 times

4 times

8 times

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

The principle of superposition states that

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The total displacement due to several waves is the sum of the displacement due to those waves acting individually

Two stationary waves superimpose to give two progressive waves

A diffraction pattern consists of many interference patterns superimposed on one another

Two progressive waves superimpose to give a stationary wave

In compressional wave,the layer of medium having reduced pressure is called:

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Compression

Elasticity

Node

Rarefaction

The force which opposes the applied force producing the displacement in the spring is called

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restoring force

periodic force

centripetal force

resistive force

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

Which one of the following could be the frequency of ultraviolet radiation?

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1.0 x 10⁶Hz

1.0 x 10⁹Hz

1.0 x 10¹²Hz

1.0 x 10¹⁵Hz

When a mass 'm' is pulled slowly, the spring stretches by an amount x₀,then the average force would be

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F= Kx₀

F=1/2Kx₀

F=2Kx₀

F=4Kx₀

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

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

Energy is not carried by

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Transverse progressive waves

Longitudinal vibration

Stationary waves

Electromagnetic

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

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 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

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

As the bob of the pendulum moves to and fro which of the force is experienced by the bob

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its weight

tension in the string

viscous drag force by air

all of them

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