We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 13 Sound with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Sound Class 8 MCQs Questions with Answers here along with a detailed explanation.
Sound Class 8 MCQs Questions with Answers
Choose the correct option.
Question 1.
The voice box is also called as
(a) stomach
(b) heart
(c) larynx
(d) mouth
Answer
Answer: (c) larynx
Question 2.
Sound is a kind of
(a) work
(b) energy
(c) force
(d) pressure
Answer
Answer: (b) energy
Question 3.
The hearing range of human ear is
(a) 20 Hz to 20,000 Hz
(b) less than 20 Hz
(c) more than 20,000 Hz
(d) 20 Hz to 25,000 Hz
Answer
Answer: (a) 20 Hz to 20,000 Hz
Question 4.
Pitch of sound is determined by its
(a) frequency
(b) speed
(c) amplitude
(d) loudness
Answer
Answer: (a) frequency
Question 5.
The frequency of subsonic sound is
(a) more than 20 Hz
(b) 100 Hz
(c) less than 20 Hz
(d) more than 20,000 Hz
Answer
Answer: (c) less than 20 Hz
Question 6.
Cochlea is a part of
(a) hearing organ
(b) sound producing organ
(c) muscular organ
(d) air pollution
Answer
Answer: (a) hearing organ
Question 7.
1 hertz is equal to
(a) 1 vibration per minute
(b) 10 vibrations per minute
(c) 60 vibrations per minute
(d) 600 vibrations per minute
Answer
Answer: (c) 60 vibrations per minute
Question 8.
Sound cannot travel through
(a) air
(b) water
(c) iron
(d) vacuum
Answer
Answer: (d) vacuum
Question 9.
The sound in the audible range is called
(a) ultrasonic sound
(b) sonic sound
(c) subsonic sound
(d) light sound
Answer
Answer: (b) sonic sound
Question 10.
Speed is
(a) \(\frac {Distance travelled}{Time}\)
(b) \(\frac {Time}{Distance travelled}\)
(c) Distance travelled × Time
(d) Time + Distance travelled
Answer
Answer: (a) \(\frac {Distance travelled}{Time}\)
Question 11.
A pendulum oscillates 20 times in 4 seconds. Find its time period.
(a) 0.05 sec.
(b) 0.001 sec.
(c) 0.2 sec.
(d) 0.1 sec.
Answer
Answer: (c) 0.2 sec.
Question 12.
Loudness of sound is determined by
(a) pitch
(b) frequency
(c) amplitude
(d) time period
Answer
Answer: (c) amplitude
Question 13.
The number of vibrations made by a vibrating body in one second is
(a) frequency
(b) noise
(c) loudness
(d) pitch
Answer
Answer: (a) frequency
Question 14.
The maximum displacement of a body from its mean position is called
(a) amplitude
(b) oscillation
(c) periodic motion
(d) frequency
Answer
Answer: (a) amplitude
Question 15.
The velocity of sound at 20°C is approximately
(a) 3400 m/sec.
(b) 340 m/sec.
(c) 430 m/sec.
(d) 304 m/sec.
Answer
Answer: (b) 340 m/sec.
Question 16.
Sound usually travels through which medium to reach our ears?
(a) Air
(b) Water
(c) Wood
(d) Asbestos
Answer
Answer: (a) Air
Question 17.
What is the speed of sound in air?
(a) 110 m/s
(b) 220 m/s
(c) 330 m/s
(d) 440 m/s
Answer
Answer: (c) 330 m/s
Question 18.
What is the length of vocal cords in men?
(a) 5 mm
(b) 10 mm
(c) 15 mm
(d) 20 mm
Answer
Answer: (d) 20 mm
Question 19.
What is the length of vocal cords in women?
(a) 5 mm
(b) 10 mm
(c) 15 mm
(d) 20 mm
Answer
Answer: (c) 15 mm
Question 20.
A vibrating body should oscillate minimum how many times per second to make a sound audible for humans?
(a) 10 times
(b) 20 times
(c) 30 times
(d) 40 times
Answer
Answer: (b) 20 times
Question 21.
The voice box is also called as
(a) pharynx
(b) throat
(c) larynx
(d) windpipe
Answer
Answer: (c) larynx
Question 22.
Speed of sound in solids is the speed of sound in liquids.
(a) same as
(b) greater than
(c) less than
(d) both (b) and (c)
Answer
Answer: (b) greater than
Question 23.
To and fro or back and forth motion of an object is termed as
(a) frequency
(b) amplitude
(c) vibration
(d) time period
Answer
Answer: (c) vibration
Question 24.
The sound above ……………… is physically painful.
(a) 20 dB
(b) 40 dB
(c) 60 dB
(d) 80 dB
Answer
Answer: (d) 80 dB
Question 25.
If we tighten the strings of an instrument, pitch will be
(a) higher
(b) lower
(c) constant
(d) no pitch
Answer
Answer: (a) higher
Question 26.
In dholak, sound is produced due to
(a) stretched membrane
(b) stretched strings
(c) air column
(d) none of these
Answer
Answer: (a) stretched membrane
Question 27.
The human ear can hear sounds having frequency in range from
(a) 200 to 20,000 Hz
(b) 20 to 2000 Hz
(c) 200 to 2000 Hz
(d) 20 to 20,000 Hz
Answer
Answer: (d) 20 to 20,000 Hz
Question 28.
Sound having frequency below 20 Hz is called
(a) infrasound
(b) ultrasound
(c) megasound
(d) microsound
Answer
Answer: (a) infrasound
Fill in the Blanks
Question 1.
In human beings sound is produced by ………………..
Answer
Answer: larynx
Question 2.
Sound of frequency lower than 20 Hz is called the ………………..
Answer
Answer: infrasonic
Question 3.
The ……………….. nerve is also present in the inner ear.
Answer
Answer: auditory
Question 4.
Sounds which are unpleasant to the ear is called ………………..
Answer
Answer: noise
Question 5.
Too much noise in our surroundings that causes discomfort is called ………………..
Answer
Answer: noise pollution
Question 6.
The speed of sound is maximum in ………………..
Answer
Answer: solids
Question 7.
Sounds of frequencies higher than 20,000 Hz are called the ……………….. sound.
Answer
Answer: ultrasonic
Question 8.
……………….. is the time taken by a vibrating body for one complete vibration.
Answer
Answer: Time period
Question 9.
Above ……………….. the noise becomes physically painful.
Answer
Answer: 80 dB
Question 10.
Plantation on the roadside can reduce ………………..
Answer
Answer: noise pollution
Question 11.
The hearing range of human ears is ………………..
Answer
Answer: 20 Hz to 20,000 Hz
Question 12.
The loudness of normal breathing of human is ………………..
Answer
Answer: 10 dB
Question 13.
Vibration is a repeated ……………….. and ……………….. motion.
Answer
Answer: to, fro
Question 14.
The loudness of sound is determined by the ……………….. of vibration.
Answer
Answer: amplitude
Question 15.
The human voice box is called ………………..
Answer
Answer: larynx
Question 16.
Sound absorbing materials are required in an auditorium to avoid …………………….
Answer
Answer: noise pollution
Question 17.
The two kinds of sounds we cannot hear are ……………………. and …………………….
Answer
Answer: infrasonic and ultrasonic
Question 18.
……………………. of any kind is the principle source of production of sound.
Answer
Answer: Vibration
Question 19.
…………………… is an instrument used in the laboratory to produce sound of a fixed frequency.
Answer
Answer: Tuning fork
Question 20.
The vibrations of a simple pendulum are also known as …………………….
Answer
Answer: oscillations
Question 21.
A soft board will ……………………. most of the sound falling on it.
Answer
Answer: absorb
True or False
Question 1.
All human beings can hear sounds of frequencies upto 60,000 Hz.
Answer
Answer: False
Question 2.
The sound in a sitar is produced by plucking its strings.
Answer
Answer: True
Question 3.
Sound cannot travel through vacuum.
Answer
Answer: True
Question 4.
Sound does not need a medium for its propagation.
Answer
Answer: False
Question 5.
The loudness is expressed in a unit called decibel.
Answer
Answer: True
Question 6.
Loud sounds have high frequencies.
Answer
Answer: False
Question 7.
Sound travel faster in air, slower in iron.
Answer
Answer: False
Question 8.
Light travels much faster than sound.
Answer
Answer: True
Question 9.
Man cannot hear sound of bats.
Answer
Answer: True
Question 10.
The time taken to complete one oscillation is called frequency.
Answer
Answer: False
Question 11.
Shriller sound has more frequency.
Answer
Answer: True
Question 12.
Tabla is a musical instrument.
Answer
Answer: True
Question 13.
The sound could not travel in solid.
Answer
Answer: False
Question 14.
The pitch of a sound depends on the frequency of the waves.
Answer
Answer: True
Question 15.
The pitch of sound produced in a guitar can be altered by reducing the vibrating length of the wire.
Answer
Answer: True
Question 16.
Voice box is situated at the lower end of the windpipe.
Answer
Answer: False
Question 17.
Vocal cords are of the same length in both men and women.
Answer
Answer: False
Question 18.
Sound does not need a medium for propagation.
Answer
Answer: False
Question 19.
The sound of sitar is produced by plucking its strings.
Answer
Answer: True
Question 20.
Amplitude measures the pitch of sound.
Answer
Answer: False
Question 21.
The SI unit of frequency is Hertz.
Answer
Answer: True
Match the following
| Column I | Column II |
| 1. Audible frequencies | (a) 10 dB |
| 2. Length of vocal cords in man | (b) 30 dB |
| 3. Ultrasound | (c) 20 mm long |
| 4. Normal breathing | (d) 20 to 20,000 Hz |
| 5. Soft whisper (At 5 m) | (e) Hertz |
| 6. Frequency | (f) Percussion instrument |
| 7. Unpleasant sound | (g) Music |
| 8. Pitch | (h) Produced by bats |
| 9. Tabla | (i) Noise |
| 10. Pleasant sound | (j) Higher frequency |
Answer
Answer:
| Column I | Column II |
| 1. Audible frequencies | (d) 20 to 20,000 Hz |
| 2. Length of vocal cords in man | (c) 20 mm long |
| 3. Ultrasound | (h) Produced by bats |
| 4. Normal breathing | (a) 10 dB |
| 5. Soft whisper (At 5 m) | (b) 30 dB |
| 6. Frequency | (e) Hertz |
| 7. Unpleasant sound | (i) Noise |
| 8. Pitch | (j) Higher frequency |
| 9. Tabla | (f) Percussion instrument |
| 10. Pleasant sound | (g) Music |
| Column A | Column B |
| 1. Back and forth | (a) Thin membrane motion |
| 2. Ektara | (b) Vibration |
| 3. Voice box | (c) Decibel |
| 4. Eardrum | (d) Musical instrument |
| 5. Loudness | (e) Larynx |
Answer
Answer:
| Column A | Column B |
| 1. Back and forth | (b) Vibration |
| 2. Ektara | (d) Musical instrument |
| 3. Voice box | (e) Larynx |
| 4. Eardrum | (a) Thin membrane motion |
| 5. Loudness | (c) Decibel |
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