Waves is 8th chapter of Physics 1st year.Types of waves,difference
between mechanical and electromagnetic waves are important topics.
Waves questions
1.
A physical system undergoing forced vibrations
is called
(a)
harmonic oscillator (b)
driven oscillator
(c)
damped oscillator (d) all of these
2.
The waves produced in a microwave oven have a
frequency equal to
(a)
2450 Hz (b)
2450 kHz
(c) 2450 MHz (d) none of these
3.
On increasing the amplitude of an oscillator
twice, its energy
(a)
increases two times (b)
decreases two times
(c)
decreases four times (d) increases
four times
4.
The SI unit of force constant is the same as
that of
(a)
force (b)
pressure
(c) surface tension (d) stress
5.
When a particle is in uniform circular motion,
its projection along the diameter axis executes
(a)
linear motion
(b)
circular motion
(c) vibratory motion (d) simple harmonic motion
6.
On shifting a simple pendulum from pole to
equator, we notice
(a)
an increase in its time period
(b)
a decrease in its time period
(c)
a change in its mass
(d)
no change either in mass or time period
7.
What happens to the time period of a mass-spring
system if the spring is replaced by a more stiff spring?
(a)
Increases (b)
Decreases
(c)
Remains the same (d) Can not be predicted.
8.
The amplitude of a forced oscillator depends
upon the
(a)
natural frequency of the oscillator
(b)
frequency of the driving force
(c)
amount of damping present
(d)
all of these
9.
A shock absorber is a
(a)
harmonic oscillator (b)
driven oscillator
(c)
damped oscillator (d) all of these
10.
In damped harmonic oscillator, the loss of
energy is due to
(a)
the decrease in frequency of the oscillator
(b)
an increase of its time period
(c)
a decrease in its amplitude
(d)
all of these
11.
Sound waves do not travel in vacuum because
these are
(a)
longitudinal waves (b)
composed of compressions
(c)
mechanical waves (d) low frequency waves
12.
In a stationary wave, the antinodes are located
at
(a)
the ends (b)
the middle
(c) between nodes (d) anywhere
13.
A simple pendulum suspended from the ceiling in
an elevator has time period T when the elevator is at rest. When the elevator
falls freely, its time period becomes
(c) zero (d) infinite
14.
When two identical waves are superimposed on
each other, the velocity of the resultant wave
(a)
decreases (b)
increases
(c)
remains the same (d) becomes zero
15.
Set of frequencies which are an integral
multiple of the fundamental frequency are called
(a)
beat frequencies (b) driving frequencies
(c)
natural frequencies (d) overtones
16.
The speed of sound in a medium depends upon
(a)
elasticity of the medium (b) density of the
medium
(c)
amplitude of sound (d) both ‘a’ and ‘b’
17.
Which one of the following properties of sound
is affected by a change in the temperature of air?
(a)
Frequency (b)
Amplitude
(c) Wavelength (d)
Intensity
18.
When a wave enters a medium, which of its
following parameters remains unchanged?
(a)
Wavelength
(b)
Speed
(c) Frequency (d) Intensity
Answers of waves
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1
|
b
|
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2
|
c
|
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3
|
d
|
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4
|
c
|
|
5
|
d
|
|
6
|
b
|
|
7
|
a
|
|
8
|
d
|
|
9
|
a
|
|
10
|
b
|
|
11
|
b
|
|
12
|
d
|
|
13
|
c
|
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14
|
d
|
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15
|
c
|
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16
|
c
|
|
17
|
d
|
|
18
|
c
|
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