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

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

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°

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

The damping depends upon the

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amplitude

sharpness

both of them

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

In the formula for finding the speed of waves in the spring, unit of m in SIn units is:

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kg

kg-meter

kg/meter

Meter/kg

Through which character we can distinguish the light waves from sound waves

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Interference

Refraction

Polarization

Reflection

Fidelity refers to

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Reproduction of original sound

Reproduction of original image

Reproduction of music

Reproduction of a CD from original copy

Smaller the damping, the resonance will be

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more flat

more sharp

both of them

none of them

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

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 expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

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

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