Question # 1

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

The expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

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

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

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displacement

frequency

amplitude

time period

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

If we increase the length of a simple pendulum four times, its time period will become

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2 times

3 times

4 times

6 times

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

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

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

Sound waves in air always

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Longitudinal

Transverse

Stationary

Electromagnetic

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

The waves in which the particles of the medium are displaced in a direction perpendicular to the direction of propagation of waves are known as

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longitudinal waves

transverse waves

non-mechanical waves

none of them

The speed of sound in a medium depends on

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The elastic property but not on the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

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

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

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