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9th Science - Sound Model Question Paper Oct-25 , 2019

Sound 

9th Science - Sound Model Question Paper

Sound Model Question Paper

9th Standard

    Reg.No. :
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Science

Time : 02:00:00 Hrs
Total Marks : 50
    6 x 1 = 6

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

    (a)

    stretched strings

    (b)

    stretched membranes

    (c)

    air columns

    (d)

    metal plates

  2. The maximum speed of vibrations which produces audible sound will be in

    (a)

    seawater

    (b)

    ground glass

    (c)

    dry air

    (d)

    Human blood

  3. The sound waves travel faster

    (a)

    in liquids

    (b)

    in gases

    (c)

    in solids

    (d)

    in vacuum

  4. Which of the following can produce longitudinal waves as well as transverse waves under different conditions?

    (a)

    TV transmitter

    (b)

    tuning fork

    (c)

    water

    (d)

    slinky

  5. The velocities of sound waves in four media P, O, Q, R and S are 18,00 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which could be a liquid medium?

    (a)

    R

    (b)

    Q

    (c)

    P

    (d)

    S

  6. The back and forth motion of the object is called ___________.

    (a)

    Vibration

    (b)

    Rotation

    (c)

    Translation

    (d)

    Linear motion

    7. 5 x 1 = 5

  7. Vibration of object produces_________.

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    sound

  8. Number of vibrations produced in one second is ____________

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    Frequency

  9. Loudness is proportional to the square of the ____________.

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    Amplitude

  10. ____________ is a medical instrument used for listening to sounds produced in the body.

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    Stethoscope

  11. Ultrasounds can also be used to detect cracks and flows in _________ .

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    metal blocks

    12. 5 x 1 = 5

  12. Tuning fork

    13. (1)

    Number of vibrations produced in unit time - Hertz

  13. Compressions

    14. (2)

    Production of sound

  14. Ultrasonics

    15. (3)

    The maximum displacement from the mean position - Metre

  15. Amplitude

    16. (4)

    Longitudinal wave

  16. Frequency

    17. (5)

    The sound whose frequency is greater than 20,000 Hz
    8 x 3 = 24

  17. Name the device which is used to produce sound in laboratory experiments.

  18. What should an object do to produce sound?

  19. Name the physical quantity whose SI unit is ‘hertz’. Define.

  20. What is meant by supersonic speed?

  21. The frequency of a source of sound is 600 Hz. Calculate the number of times it
    vibrates in a minute?

  22. What is sound? how it is produced?

  23. What is the condition for hearing Echo.

  24. Radio waves of speed 3 x 108 ms-1 are reflected off the moon and received back on earth. The time elapsed between the sending of the signal and receiving it back at the earth station is 2.5s. What is the distance of the moon from the earth.

    25. 2 x 5 = 10

  25. List the applications of sound.

  26. Explain how does SONAR work?

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