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10th Standard Science - Acoustics Model Question Paper Oct-04 , 2019

Acoustics

10th Standard Science - Acoustics Model Question Paper

Acoustics Model Question Paper

10th Standard

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Science

Time : 01:30:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. When a sound wave travels through air, the air particles

    (a)

    vibrate along the direction of the wave motion

    (b)

    vibrate but not in any fixed direction

    (c)

    vibrate perpendicular to the direction of the wave motion

    (d)

    do not vibrate

  2. The frequency, which is audible to the human ear is

    (a)

    50 kHz

    (b)

    20 kHz

    (c)

    15000 kHz

    (d)

    10000 kHz

  3. The velocity of sound in air at a particular temperature is 330 ms-1. What will be its value when temperature is doubled and the pressure is halved?

    (a)

    330 ms-1

    (b)

    165 ms-1

    (c)

    330 x \(\sqrt { 2 } \) ms-1

    (d)

    320/\(\sqrt { 2 } \) ms-1

  4. If a sound wave travels with a frequency of 1.25 x 104 Hz at 344 ms-1, the wavelength will be 

    (a)

    27.52 m

    (b)

    275.2 m

    (c)

    0.02752 m

    (d)

    2.752 m

  5. Velocity of sound in the atmosphere of a planet is 500 ms-1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be

    (a)

    17 m

    (b)

    20 m

    (c)

    25 m

    (d)

    50 m

    6. 5 x 1 = 5

  6. Rapid back and forth motion of a particle about its mean position is called _____

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    Vibration

  7. A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 ms–1. The frequency heard by the observer is (speed of sound = 330 ms–1) ______.

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    500 Hz

  8. A wave motion is a transfer of _______.

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    energy

  9. In a region of compression there is ______ in volume.

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    decrease

  10. SI unit of frequency is _________.

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    hertz

    11. 5 x 1 = 5

  11. Infrasonic

    12. (1)

    22 kHz

  12. Ultrasonic

    13. (2)

    frequency

  13. High pressure region

    14. (3)

    Distance

  14. Wavelength

    15. (4)

    10 Hz

  15. Pitch

    16. (5)

    Compressions
    2 x 2 = 4

  16. Assertion: Sound travels faster in solids than in gases.
    Reason: Solid posses a greater density than that of gases.
    a. If both the assertion and the reason are true and the reason is the correct explanation of the assertion.
    b. If both the assertion and the reason are true but the reason is not the correct explanation of the assertion.
    c. Assertion is true, but the reason is false.
    d. Assertion is false, but the reason is true.

  17. Assertion: Distinguishing the loud sound from faint sound is called loudness.
    Reason: The loudness of normal human voice is 100 dB.
    Codes:
    (a) Both assertion and reason are true and reason is the correct explanation of assertion.
    (b) Both assertion and reason are true but reason is not the correct explanation of assertion.
    (c) Assertion is true but reason is false.
    (d) Assertion is false but reason is true.

    18. 6 x 2 = 12

  18. What is a longitudinal wave?

  19. What is the minimum distance needed for an echo?

  20. What is the work of architectural acoustician?

  21. Define wavelength.

  22. What is particle velocity?

  23. State the Doppler effect.

    24. 3 x 4 = 12

  24. Why does sound travel faster on a rainy day than on a dry day?

  25. The thunder of cloud is heard 9.8 seconds later than the flash of lightning. If the speed of sound in air is 330 m s-1, what will be the height of the cloud?

  26. Write the applications of echo.

    27. 1 x 7 = 7

  27. What are the factors that affect the speed of sound in gases?

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