Class 8 Chapter-9 - Sound MCQs With Answer

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Chapter-9 (Sound)

Multiple Choice Questions (MCQs) with answers

1. __________ is produced by the vibrations, or the to-and-fro motion, of a body. 

    (a) Light

    (b) Sound 

    (c) Electricity 

Answer : (b) Sound 

2. The basic sound produced is the loudest and is called the __________.

      (a) fundamental

      (b) harmonics

      (c) vibrations 

Answer : (a) fundamental 

3. The loudness of a sound is measured in __________.

     (a) Litres

     (b) Pascal

     (c) Decibels

Answer : (c) Decibels 

4. The organ which helps us speak is called the __________.

      (a) cartilage 

      (b) trachea

      (c) larynx

Answer : (c) larynx 

5. All higher animals communicate with each other by making sounds with the help of __________.

    (a) Vocal Cords

    (b) Pinna

    (c) Cartilage 

Answer : (a) Vocal Cords

6. __________ are reflected sound. 

    (a) Vibrations

    (b) Echoes

    (c) Lights

Answer : (b) Echoes 

7. Sound has _____ characteristics. 

     (a) 3

     (b) 4

     (c) 5

Answer : (a) 3

8. The pitch of a sound depends on the __________ of vibrations. 

    (a) mass

    (b) quantity

    (c) frequency 

Answer : (c) frequency 

9. The quality of a sound depends on the __________ of the harmonics present. 

    (a) weight

    (b) number

    (c) length 

Answer : (b) number

10. Sound travels __________ in solids than liguids. 

      (a) faster 

      (b) slower

      (c) equal

Answer : (a) faster

11. Echoes can be heard only when the reflecting surface is about _____ m away. 

       (a) 11

       (b) 12

       (c) 13

Answer : (a) 11                                             

12. Sounds of lower frequencies are called __________.

       (a) ultrasonics

       (b) harmonics

       (c) infrasonics

Answer : (c) infrasonics

13. Sound needs a __________ to travel

        (a) vehicle

       (b) medium

        (c) truck

Answer : (b) medium

14. __________ are used to locate underwater objects and measure the depth of the sea.                 (a) Echoes

       (b) Vibrations

       (c) Harmonics

Answer :  (a) Echoes

15. The innear ear has a coiled tube called the __________. 

       (a) stirrup

       (b) cochlea

       (c) anvil

Answer : (b) cochlea 

16. ____________ is the technique used by doctors to create images of heart.

       (a) ultrasonography

       (b) photography

        (c) echocardiography

Answer : (c) echocardiography

17. Sounds of higher frequencies ___________. 

        (a) infrasinfrasonics

        (b) vibrations

        (c) ultrasonics

Answer : (c) ultrasonics 

18. ______ seperates outer ear from middle ear. 

      (a) eardrum

      (b) pinna

       (c) ear canal

Answer : (a) Eardrum

19. The __________ of a vibrating body is the number of vibrations it completes in one second.

       (a) mass

        (b) frequency 

         (c) quantity 

Answer : (b) frequency                              

20. The loudness of a sound depends on the ________ of the vibrations that produce it. 

(a) amplitude

(b) quantity

(c) frequency                                                               

Answer : (a) amplitude

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