Study
of sound Chapter No12 Class 9 MCQ
Science
and Technology
Maharashtra
State Board
Class:
9 MCQ
|
1 |
When the
vibrating object moves back words, it creates a region of low pressure
called….? |
|
A |
Refraction |
|
B |
Reflection |
|
C |
Rarefaction |
|
D |
Retardation |
|
ANS |
Rarefaction |
|
2 |
Mexican wave in
a stadium is an example of ? |
|
A |
Longitudinal
wave |
|
B |
Transverse wave |
|
C |
Electromagnetic
wave |
|
D |
None of the
option |
|
ANS |
Transverse wave |
|
3 |
The distance
which compression or a rarefaction travels per unit of time gives? |
|
A |
The density of
sound wave |
|
B |
Speed of sound |
|
C |
Wavelength of
sound |
|
D |
Frequency of
sound |
|
ANS |
Speed of sound |
|
4 |
Sound travels
through which medium? |
|
A |
Solid |
|
B |
Liquid |
|
C |
Gas |
|
D |
All the above |
|
ANS |
All the above |
|
5 |
When a body
vibrates, it compresses the air surrounding and forms a high – density area
known as …? |
|
A |
Refraction |
|
B |
Reflection |
|
C |
Rarefaction |
|
D |
Compression |
|
ANS |
Compression |
|
6 |
The phenomenon
when a sound produced is heard again due to reflection is called …..? |
|
A |
Sound bounce |
|
B |
Mirage |
|
C |
An eco |
|
D |
Interference |
|
ANS |
An echo |
|
7 |
The number of
compression or rarefactions per unit time gives ….? |
|
A |
Frequency |
|
B |
Time period |
|
C |
Amplitude |
|
D |
Pitch |
|
ANS |
Pitch |
|
8 |
Sound waves in
air is an examples of ……..? |
|
A |
Longitudinal
wave |
|
B |
Transverse wave |
|
C |
Electromagnetic
wave |
|
D |
None of the
option |
|
ANS |
Longitudinal wave |
|
9 |
Which part of
human ear converts sound vibrations into electrical signals? |
|
A |
Hammer |
|
B |
Stirrup |
|
C |
Tympanic
membrane |
|
D |
Cochlea |
|
ANS |
Cochlea |
|
10 |
What do
dolphins, bats and porpoise use? |
|
A |
Ultra sound |
|
B |
Infra sound |
|
C |
Both a and b |
|
D |
None of them |
|
ANS |
Ultra sound |
|
11 |
Children under
the age of 5 can hear upto? |
|
A |
25 Hz |
|
B |
25 k Hz |
|
C |
20 Hz |
|
D |
25 kHz |
|
ANS |
25 k Hz |
|
12 |
Reverberation of
sound is used in? |
|
A |
Stethoscope |
|
B |
Trumpets |
|
C |
Megaphone |
|
D |
All of these |
|
ANS |
All of these |
|
13 |
To here a
distinct echo each time interval between the original sound and the refrected
sound must be? |
|
A |
0.25 |
|
B |
1 s |
|
C |
2 s |
|
D |
0.1 s |
|
ANS |
0.1 s |
|
14 |
Speed of sound
depends upon? |
|
A |
Temperature of
the medium |
|
B |
Pressure of the
medium |
|
C |
Temperature of source
producing sound |
|
D |
Temperature and
pressure of medium |
|
ANS |
Temperature and pressure of medium |
|
15 |
Which characteristics in this? We can distinguish between sound having same pitch
and loudness? |
|
A |
Tone |
|
B |
Note |
|
C |
Pitch |
|
D |
Timber |
|
ANS |
Timber |
|
16 |
Loud sound can
travel a larger distance, due to? |
|
A |
Higher amplitude |
|
B |
Higher energy |
|
C |
High frequency |
|
D |
High speed |
|
ANS |
Higher energy |
|
17 |
A wave in slinky
travelled two and from in 5 sec the length of the slinky is 5m, what is the
velocity of wave? |
|
A |
10 ms |
|
B |
5 m/s |
|
C |
2 m/s |
|
D |
25 m/s |
|
ANS |
2 m/s |
|
18 |
Sound waves with
frequency less than 20 Hz and more than 20000 Hz is called? |
|
A |
Supersonic and
ultrasonic |
|
B |
Sonic boom and
supersonic |
|
C |
Infrasonic and
sonic boom |
|
D |
Infrasonic and
ultrasonic |
|
ANS |
Infrasonic and ultrasonic |
|
19 |
The product of time-period
and frequency is? |
|
A |
Infinity |
|
B |
Zero |
|
C |
Unity |
|
D |
None of these |
|
ANS |
Unity |
|
20 |
Sound waves are? |
|
A |
Longitudinal |
|
B |
Partly
longitudinal, partly transverse |
|
C |
Transverse |
|
D |
Sometimes
longitudinal, sometimes transverse |
|
ANS |
Longitudinal |
|
21 |
The time period
of a simple pendulum in a spacecraft orbiting the earth is? |
|
A |
Infinity |
|
B |
Zero |
|
C |
One second |
|
D |
Two second |
|
ANS |
Infinity |
|
22 |
Speed of sound
in vacuum is? |
|
A |
300 m/s |
|
B |
600 m/s |
|
C |
380 m/s |
|
D |
340 m/s |
|
ANS |
340 m/s |
|
23 |
The sound which
is produce due to a mixture of several frequencies is called? |
|
A |
A note |
|
B |
A tone |
|
C |
Frequency |
|
D |
Amplitude |
|
ANS |
A note |
|
24 |
Pitch of the
wave is measured in terms of? |
|
A |
Speed of the
wave |
|
B |
Amplitude of the
wave |
|
C |
Frequency of the
wave |
|
D |
Time period of
the wave |
|
ANS |
Frequency of the wave |
|
25 |
The distance
between any two compression or rarefactions in a longitudinal wave is? |
|
A |
One wavelength |
|
B |
Half wavelength |
|
C |
Twice the
wavelength |
|
D |
One fourth
wavelength |
|
ANS |
One wavelength |
|
26 |
Sound waves are? |
|
A |
Longitudinal in
nature |
|
B |
Transverse in
nature |
|
C |
Electromagnetic
in nature |
|
D |
Magnetic in
nature |
|
ANS |
Longitudinal in nature |
|
27 |
Compression is a
region of? |
|
A |
No pressure |
|
B |
Low pressure |
|
C |
Atmospheric pressure |
|
D |
High pressure |
|
ANS |
High pressure |
|
28 |
For its
propagation sound requires? |
|
A |
All of the above |
|
B |
Air |
|
C |
Water |
|
D |
Iron |
|
ANS |
All of the above |
|
29 |
SI unit of
frequency is? |
|
A |
Meter |
|
B |
Hertz |
|
C |
M/s |
|
D |
M/s2 |
|
ANS |
Hertz |
|
30 |
In gases a sound
wave is? |
|
A |
Longitudinal
only |
|
B |
Transverse only |
|
C |
Both transverse
and Longitudinal |
|
D |
Neither
transverse nor longitudinal |
|
ANS |
Both transverse and longitudinal |
0 Comments