Question # 1

A physical system under going forced vibrations is known as

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Simple harmonic oscillator

Compound harmonic oscillator

Physical harmonic oscillator

driven harmonic oscillator

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

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

The expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

If the mass of the simple pendulum becomes double, its time period

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increase

decreases

remains constant

none of them

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

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

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

The waves moving from a sitar to a listener in air are

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Longitudinal progressive

Longitudinal stationary

Transverse progressive

Transverse stationary

Shock absorber of the car is an example of

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resonance

forced oscillations

interference

damped oscillations

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

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 waves which propagate through the oscillations of material particles are known as:

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Mechanical waves

Electromagnetic waves

Any of them

None of them

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

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Interference

Diffraction

Polarization

Refraction

The waves in which the particles of the medium have displacement along the direction of propagation of waves are called

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longitudinal waves

transverse waves

non-mechanical waves

none of them

When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

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W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

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

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displacement

frequency

amplitude

time period

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

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mass

length

material

all of them

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

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

The instantaneous velocity of a body moving along a circle is directed

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along the radius

along the tangent

away from the circle

none of them

For transmission of both transverse and longitudinal waves, we can use:

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Solid

Gas

Plasma

None of these

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

If the time period a simple pendulum is 2 s, its frequency would be

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2 Hz

1.5 Hz

1.0 Hz

0.5 Hz

The damping depends upon the

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amplitude

sharpness

both of them

none of them

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

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

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resonance

interference

diffraction

damping

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

Resonance occurs when one of the natural frequencies of vibration of the forced or driven harmonic oscillator

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greater than the frequency of applied force

equal to the frequency of applied force

less than the frequency of applied force

all of them

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