MCQ Questions for Class 8 Science Chapter 13 Sound
Solving the Sound Multiple Choice Questions of Class 8 Science Chapter 13 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Sound Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 13 Science Class 8 and cross-check your answers during preparation.
Question 1.
Sound can travel through:
(a) gases only
(b) solids only
(c) liquids only
(d) solids, liquids and gases
Answer
(d) solids, liquids and gases
Sound can travel through solids, liquids and gases.
Question 2.
Voice of which of the following is likely to have minimum frequency:
(a) baby girl
(b) baby boy
(c) a man
(d) a woman
Answer
(a) baby girl
Baby girl is likely to have minimum frequency.
Question 3.
Vibration in a body produce:
(a) energy
(b) sound
(c) heat
(d) none of these
Answer
(b) sound
Vibration if a body produce sound.
Question 4.
A shehnai produces sound from:
(a) vibrating strings
(b) vibrating membrane
(c) vibrating air column
(d) none of these
Answer
(c) vibrating air column
A shehnai produces sound from vibrating air column.
Question 5.
Drum produces sound from:
(a) vibrating membrane
(b) vibrating stretched membrane
(c) vibrating strings
(d) none of these
Answer
(b) vibrating stretched membrane
Drum produces sound from vibrating stretched membrane.
Question 6.
Frequency of oscillations is:
(a) the number of oscillations per minute
(b) the number of oscillations per hour
(c) the number of oscillations per second
(d) none of these
Answer
(c) the number of oscillations per second
Frequency of oscillations is the number of oscillations per second.
Question 7.
The unit of frequency is:
(a) hertz
(b) hertz /sec
(c) hertz / min
(d) hertz / hour
Answer
(a) hertz
The unit of frequency is hertz.
Question 8.
The frequency determines the of a sound.
(a) loudness
(b) pitch
(c) both loudness and pitch
(d) none of these
Answer
(b) pitch
The frequency determines the pitch of a sound.
Question 9.
When the amplitude is small, the sound produced is:
(a) loud
(b) feeble
(c) low pitched
(d) none of these
Answer
(b) feeble
When the amplitude is small, the sound produced is feeble.
Question 10.
The ultrasound equipment works at frequencies:
(a) higher than 20,000 Hz
(b) lower than 20,000 Hz
(c) less than 20 Hz
(d) none of these
Answer
(a) higher than 20,000 Hz
The ultrasound equipment works at frequencies higher than 20,000 Hz.
Question 11.
Noise pollution causes:
(a) lack of sleep
(b) hypertension
(c) anxiety
(d) all of these
Answer
(d) all of these
Noise pollution causes lack of sleep, hypertension, anxiety.
Question 12.
Trees planted along the roads reduces the harmful effect of:
(a) noise pollution
(b) air pollution
(c) both (a) and (b)
(d) none of these
Answer
(c) both (a) and (b)
Trees planted along the roads reduces the harmful effects of noise pollution and air pollution.
Question 13.
Number of vocal cords in human is:
(a) one
(b) two
(c) four
(d) none of these
Answer
(b) two
Number of vocal cords in human is two.
Question 14.
Sound:
(a) can travel through vacuum
(b) cannot travel through vacuum
(c) sound can sometimes travel through
(d) none of these vacuum
Answer
(b) cannot travel through vacuum
Sound cannot travel through vacuum.
Question 15.
Sound:
(a) Sound requires a medium to travel
(b) does not require a medium to travel
(c) sometimes require a medium to travel
(d) none of these
Answer
(a) Sound requires a medium to travel
Sound requires a medium to travel.
Question 16.
Propagation of sound is fastest In:
(a) gases
(b) liquids
(c) solids
(d) vacuum
Answer
(c) solids
Propagation of sound is fastest in solids.
Question 17.
Sound does not travel in:
(a) vacuum
(b) gases
(c) solids
(d) liquids
Answer
(a) vacuum
Sound does not travel in vacuum.
Question 18.
Unwanted and unpleasant sounds are called:
(a) noise
(b) noise pollution
(c) music
(d) air pollution
Answer
(a) noise
Noise is unwanted and unpleasant sound.
Question 19.
Process of receiving sound vibrations and sensing them by brain is called :
(a) producing
(b) speaking
(c) sensing
(d) hearing
Answer
(d) hearing
Process of receiving sound vibrations and sensing them by brain is called hearing
Question 20.
Voice box has stretched string like parts, which vibrate to produce sound are called:
(a) larynx
(b) vocal cords
(c) nerves
(d) arteries
Answer
(b) vocal cords
Voice box has stretched string like parts, which vibrate to produce sound are called vocal cords.
Quesiton 21.
Large amplitude of sound vibrations will produce:
(a) loud sound
(b) slow sound
(c) meak sound
(d) shreak
Answer
(a) loud sound
Large amplitude of sound vibrations will produce loud sound.
Question 22.
High frequency of sound vibrations will produce a:
(a) loud sound
(b) shreak
(c) meak sound
(d) low piched sound
Answer
(b) shreak
High frequency of sound vibration will produce a shreak.
Question 23.
Excess unwanted sounds is environment can cause:
(a) noise
(b) disturbance
(c) noise pollution
(d) air pollution
Answer
(c) noise pollution
Excess unwanted sounds is environment can cause noise pollution.
Question 24.
The range of audible sound for human ear is:
(a) less than 20 Hz
(b) more than 20,000 Hz
(c) from 20 Hz to 20,000 Hz
(d) none of these
Answer
(c) from 20 Hz to 20,000 Hz
The range of audible sound for human ear is from 20 Hz to 20,000 Hz.
Question 25.
The amplitude of the sound wave decides its:
(a) loudness
(b) pitch
(c) speed
(d) none of these
Answer
(a) loudness
The amplitude of the sound wave decides its loudness.
Question 26.
If the amplitude becomes twice than the loudness of sound increases by a factor of:
(a) 2
(b) 4
(e) no change
(d) none of these
Answer
(b) 4
If the amplitude becomes twice than the loudness of sound increases by a factor of 4. Loudness of sound is proportional to the square of the amplitude of the vibration producing the sound.
Question 27.
In sitar sound Is produced by:
(a) beating
(b) rubbing
(c) blowing
(d) plucking
Answer
Answer: (a)
In sitar sound is produced by plucking.
Match the Column-A with Column-B:
Question 1.
| Column-A | Column-B |
| (a) Unit of frequency | (i) Amplitude |
| (b) Pleasant sound | (ii) High frequency |
| (c) Unwanted sound | (iii) Hertz |
| (d) High pitch sound | (iv) Music |
| (e) Loudness | (v) Noise |
Answer
| Column-A | Column-B |
| (a) Unit of frequency | (iii) Hertz |
| (b) Pleasant sound | (iv) Music |
| (c) Unwanted sound | (v) Noise |
| (d) High pitch sound | (ii) High frequency |
| (e) Loudness | (i) Amplitude |
Question 2.
| Column-A | Column-B |
| (a) Number of vibrations produced by a vibrating particle in one second | (i) 330 m / sec |
| (b) Pitch | (ii) frequency |
| (c) Flute | (iii) vibration |
| (d) To and fro motion of a vibrating body about its mean position | (iv) vibration air column |
| (e) Speed of sound in air | (v) frequency of vibration |
Answer
| Column-A | Column-B |
| (a) Number of vibrations produced by a vibrating particle in one second | (v) frequency of vibration |
| (b) Pitch | (ii) frequency |
| (c) Flute | (iv) vibration air column |
| (d) To and fro motion of a vibrating body about its mean position | (iii) vibration |
| (e) Speed of sound in air | (i) 330 m / sec |
Question 3.
| Column-A | Column-B |
| (a) Sound propagation | (i) Time period |
| (b) Maximum displacement of a vibrating particle from its mean position | (ii) Vacuum |
| (c) 1 KHz | (iii) Amplitude |
| (d) Time in which vibrating particle completes one vibration | (iv) Material medium |
| (e) A medium through which sound cannot travel | (v) 1000 Hz |
Answer
| Column-A | Column-B |
| (a) Sound propagation | (iv) Material medium |
| (b) Maximum displacement of a vibrating particle from its mean position | (iii) Amplitude |
| (c) 1 KHz | (v) 1000 Hz |
| (d) Time in which vibrating particle completes one vibration | (i) Time period |
| (e) A medium through which sound cannot travel | (ii) Vacuum |
State whether the following statements are True or False:
Question 1.
Sound cannot travel in vacuum.
Answer
True
Question 2.
The number of oscillations per sound of a vibrating object is called its time period.
Answer
False
Question 3.
If the amplitude of vibration is large, sound is feeble.
Answer
False
Question 4.
For human ears, the audible range is 20 Hz to 20,000 Hz.
Answer
True
Question 5.
The lower the frequency of vibration, the higher is the pitch.
Answer
False
Question 6.
Unwanted or unpleasant sound is termed as music.
Answer
False
Question 7.
Noise pollution may cause partial hearing impairment.
Answer
True
Question 8.
The loudness of sound is measured in hertz.
Answer
False
Question 9.
One hertz means one vibration per second.
Answer
False
Question 10.
Sound travels fastest in solids.
Answer
true
Question 11.
We can hear all the vibrations made by different bodies.
Answer
False
Question 12.
Cusions, curtains and rugs absorb sound.
Answer
True
Question 13.
The quality of sound depends on the material of vibrating part.
Answer
True
Question 14.
Sound with frequency above 20,000 Hz is called ultrasonic.
Answer
True
Question 15.
Smaller the amplitude of vibration, the louder is the sound.
Answer
False
Question 16.
In human beings, the vibration of the vocal cords produces sound.
Answer
True
Fill in the blanks:
Question 1.
Time taken by an object to complete one oscillation is called …………………….
Answer
time period
Question 2.
Loudness is determined by the ……………………. of vibration.
Answer
amplitude
Question 3.
The unit of frequency is ……………………..
Answer
hertz
Question 4.
Unwanted sound is called ……………………..
Answer
noise
Question 5.
Shrillness of a sound is determined by the ……………………. of vibration.
Answer
frequency
Question 6.
Sound is produced by ……………………. objects.
Answer
vibrating
Question 7.
……………………. in human beings vibrate to produce sound.
Answer
Vocal cords
Question 8.
When we touch a source of sound, we can feel the ……………………..
Answer
vibrations
Question 9.
Sound cannot travel in ……………………..
Answer
vacuum
Question 10.
The audible frequency for human ear is ……………………..
Answer
20 Hz to 20,000 Hz
Question 11.
Sound requires a ……………………. to travel.
Answer
medium
Question 12.
The number of vibrations per second defines ……………………..
Answer
frequency
Question 13.
Sound travels fastest in ……………………..
Answer
solids
Question 14.
Only vibrating bodies produce ……………………..
Answer
sound
Question 15.
……………………. part of dholak vibrate to produce sound.
Answer
Stretched membrane
Question 16.
……………………. part of Sitar vibrate to produce sound.
Answer
Stretched string
Question 17.
……………………. part of flute vibrate to produce sound.
Answer
Air column
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