Class 8 Science Chapter 13 MCQ (Multiple Choice Questions) of Sound for CBSE and State board students prepared for new academic session 2022-2023 free to use. All the contents are prepared from latest NCERT Books issued for new academic session 2022-23. 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 2022-2023

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

## MCQ Tests with Answers for Class 8 Science Chapter 13

Q1

#### In order to reduce the loudness of a sound, we have to:

[A]. Decrease its frequency of vibration of the sound.
[B]. Increase its frequency of vibration of the sound.
[C]. Decrease its amplitude of vibration of the sound.
[D]. Increase its amplitude of vibration of the sound.
Q2

#### Loudness of sound is measured in units of

[A]. Decibel (dB)
[B]. Hertz (Hz)
[C]. Metre (m)
[D]. Metre/second (m/s)
Q3

#### 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.
Q4

#### 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
Q5

#### 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.
Q6

#### Which of the following statement is or are incorrect?

[A]. Sound can travel through solids, liquids and gases.
[B]. The sound of ringing telephone bell travels to us through the air in the room.
[C]. Sound cannot travel through vacuum because vacuum has no molecules which can vibrate and carry sound waves.
[D]. None of the above.
Q7

#### Ultrasound has frequency of vibration:

[A]. Between 20 and 20,000 Hz
[B]. Below 20 Hz
[C]. Above 20,000 Hz
[D]. Between 500 and 10,000 Hz
Q8

#### 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.
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

#### A simple pendulum makes 10 oscillation in 20 seconds. What is the time period and frequency of its oscillations?

[A]. 0.5 Hz and 2 s respectively
[B]. 0.1 Hz and 0.5 s respectively
[C]. 0.2 Hz and 3 s respectively
[D]. 0.3 Hz and 4 s respectively
Q11

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

#### 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.
Q13

#### Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?

[A]. Stretched strings
[B]. Stretched membranes
[C]. Metal plates
[D]. Air columns
Q14

#### Which of the following sound frequencies can be heard by a woman having a normal hearing range?

[A]. 25000 Hz and 15 kHz
[B]. 15 kHz and 40000 Hz
[C]. 15 kHz and 25 Hz
[D]. 25 Hz
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

#### Read the following sentences carefully, and choose the correct one:

[A]. Manjira is a plate type musical instrument.
[B]. Mridangam, table, dholak are the examples of membrane type musical instrument.
[C]. Bansuri, trumpet, shehnai are the examples of musical wind instrument.
[D]. All the above.
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

[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

[A]. M
[B]. N
[C]. O
[D]. P
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

#### Which of the following statement is or are incorrect?

[A]. The number of vibrations made in one second is called the frequency of vibration.
[B]. When an object makes one vibration per second, its frequency is said to be 1 hertz.
[C]. The loudness of sound depends on the amplitude of vibrations of the vibrating object.
[D]. All the above.
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