Question # 1

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

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

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Compression

Elasticity

Node

Rarefaction

Smaller the damping, greater will be the

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frequency

wavelength

amplitude

none of them

When temperature increase, the frequency of a tuning fork

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Increases

Decreases

Remains same

Increase or decreases depending on the material

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

The expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

When a mass 'm' is pulled slowly through a distance 'x_o' , the elastic potential energy of the spring would be

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P.E=Kx²_o

P.E= 1/2kx_o

P.E=1/2Kx²_o

P.E=Kx²_o

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 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

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

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1 second

2 seconds

3 seconds

4 seconds

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

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Longitudinal wave

Transverse wave

Progressive wave

Stationary wave

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

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

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Wave number

Frequency

Wavelength

Time period

The waves produced in a microwave oven have wavelength.

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12 mm

12 cm

12 m

12 mm

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

When a body is pulled away from its rest or equilibrium position and then released, the body oscillates due to

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applied force

momentum

restoring force

none of them

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