Class 8 Science Chapter 13 MCQ

Class 8 Science Chapter 13 MCQ (Multiple Choice Questions) of Sound for CBSE and State board students prepared for new academic session 2021-2022 free to use. All the contents are prepared from latest NCERT Books issued for new academic session 2021-22.

Now a days MCQs are important part of question papers in exams. These MCQ contains all the important extra questions covering the complete chapter of NCERT Book class 8 Science chapter 13.

Class 8 Science Chapter 13 MCQ for 2021-2022

Class: 8Science
Chapter: 13Sound
Contents: MCQ Online Tests

MCQ Tests with Answers for Class 8 Science Chapter 13

Q1

Loudness of sound is measured in units of

[A]. Decibel (dB)
[B]. Hertz (Hz)
[C]. Metre (m)
[D]. Metre/second (m/s)
Q2

Consider the following statements and choose the correct one:

[A]. Sound is produced by the vibration of vocal cords.
[B]. The human voice box or larynx contain two ligaments known as “vocal cords”.
[C]. The human beings produce sound by using the voice box which is called larynx.
[D]. All the above.
Q3

The loudness of sound is determined by its:

[A]. Amplitude of vibration
[B]. Ratio of amplitude and frequency of vibration
[C]. Frequency of vibration
[D]. Product of amplitude and frequency of vibration
Q4

Vikash is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

[A]. When the muscles of vocal cords contract and stretch, the vocal cords become tight and thin and a sound of high frequency is produced.
[B]. When the muscles relax, the vocal cords become loose and thick and a sound of low frequency is produced.
[C]. Due to the shorter vocal cords, the frequency or pitch of a woman’s voice is higher than that of a man.
[D]. None of the above.
Q5

Pitch of sound is determined by its

[A]. Frequency
[B]. Amplitude
[C]. Speed
[D]. Loudness




Q6

Which of the following statements are correct?

[A]. Sound is produced by vibration and sound requires a medium for propagation.
[B]. Sound is produced by vibration and sound requires a medium for propagation and light and sound both requires a medium for propagation.
[C]. Sound requires a medium for propagation and light and sound both requires a medium for propagation and sound travel slower than light.
[D]. Sound is produced by vibration and sound requires a medium for propagation and sound travel slower than light.
Q7

Puja is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. Most of the sounds which we hear in our everyday life reach us through the air.
[B]. Sound cannot be heard on the surface of moon because there is no air to carry the sound waves.
[C]. The astronauts who land on moon, talk to each other through wireless sets using radio waves.
[D]. Sound can be heard on the moon but only the 1/6th part of the total sound.
Q8

The loudness of sound depends on:

[A]. Its amplitude
[B]. Its time period
[C]. Its frequency
[D]. Its speed
Q9

In which of these medium can sound travel?

[A]. Wood and Water
[B]. Wood and Water and Air
[C]. Air and Vacuum
[D]. Water and Air and Vacuum
Q10

An object is vibrating at 50 Hz. What is its time period?

[A]. 0.02 s
[B]. 2 s
[C]. 0.2 s
[D]. 20 s



Q11

Lighting can be seen at the moment when it occurs. Paheli observes lighting in her area. She hears the sound 5 seconds after she observed lighting. How far is she from the place where lightning occurs?

[A]. 1.56 km
[B]. 1.65 km
[C]. 16.5 km
[D]. 15.6 km
Q12

Read the following sentences carefully, and choose the incorrect one:

[A]. [A] The speed of sound in air is 340 meters per second.
[B]. The speed of sound in water is 1500 meters per second.
[C]. Sound travels at a speed of 5000 metres per second through iron or steel.
[D]. None of the above.
Q13

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. The outer part of ear is called “pinna”.
[B]. The inner part of ear has a coiled tube called “cochlea”.
[C]. The three tiny bones in the ear act as a system of levers and sound vibration passing them on the brain.
[D]. None of the above.
Q14

Consider the following statements and choose the incorrect one:

[A]. Partial hearing loss can also be caused by noise pollution.
[B]. Partial hearing loss is generally due to an illness, infection, injury or old age.
[C]. Hearing Aid is a small sound amplifying device worn on the ear by any deaf person.
[D]. None of the above
Q15

Choose the statements which are correct to measure to control noise pollution:

[A]. The bursting of crackers should be avoided
[B]. We should not play a television, radio, stereo-system too loudly.
[C]. The too loud horns of motor vehicles should not be blown unnecessarily.
[D]. All the above.




Q16

Before playing the orchestra is in a musical concert a sitarist tries to adjust the tension and pluck the string suitably. By doing so he is adjusting:

[A]. Intensity of the sound only
[B]. Amplitude of the sound only
[C]. Frequency of the sitar string with the frequency of other musical instruments
[D]. Loudness of the sound
Q17

Choose the statements which are incorrect about noise pollution:

[A]. Loud noise can cause irritation and headache.
[B]. Loud noise can even damage the ears permanently and cause deafness.
[C]. Loud noise can cause an ailment called hypertension or high blood pressure.
[D]. Loud noise gives energy to all young persons including teenag
Q18

A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:

[A]. Sound will be louder but pitch will not be different
[B]. Sound will be louder and the pitch will also be higher
[C]. Sound will be louder but pitch will be lower
[D]. Both loudness and pitch will remain unaffected
Q19

The ultrasound waves can penetrate into matter to a large extent because they have:

[A]. Very high speed
[B]. Very high frequency
[C]. Very high quality
[D]. Very high amplitude
Q20

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. Ultrasound is used to study the growth of foetus inside the mother’s womb.
[B]. Ultrasound is used to measure the depth of sea or ocean and also used to locate underwater objects.
[C]. Ultrasound is used in the treatment of muscular pain and a disease called arthritis which is inflammation of joints.
[D]. None of the above.



Q21

We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called:

[A]. Frequency
[B]. Timbre
[C]. Pitch
[D]. Loudness
Q22

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. The sounds of frequencies less than 20 hertz are called infrasonic.
[B]. The range of audible frequency of sound for human hearing is from 20 hertz to 20000 Hertz.
[C]. The sound of frequencies greater than 20,000 hertz are called ultrasonics.
[D]. All the above.
Q23

Which of the following modes is utilized in the production of sound by humans?

[A]. Vibrating membranes.
[B]. Vibrating plates.
[C]. Vibrating strings.
[D]. Vibrating air columns.
Q24

In a science quiz competition, Payel is asked a question where she had to choose the statement which was/were incorrect?

[A]. The voice of a woman is shriller than that of a man.
[B]. The voice of a small baby is even more shrill than that of a woman.
[C]. As the frequency of vibration of an object increases, the pitch or shrillness of sound produced by it also increases.
[D]. None of the above.
Q25

The sound from a mosquito is produced when it vibrates its wings at the average rate of 500 vibration per second. What is the time period of the vibration?

[A]. 0.002 seconds
[B]. 0.02 seconds
[C]. 0.2 seconds
[D]. 2.0 seconds

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