Sound English Medium Free Online Test 1 Mark Questions 2020-2021

9th Standard

    Reg.No. :
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Science

Time : 00:10:00 Hrs
Total Marks : 10

    Part A

    10 x 1 = 10
  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. A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through

    (a)

    wax

    (b)

    vacuum

    (c)

    water

    (d)

    empty vessel

  3. Which of the following statement best describes frequency?

    (a)

    the number of complete vibrations per second.

    (b)

    the distance travelled by a wave per second.

    (c)

    the distance between one crest of wave and the next one.

    (d)

    the maximum disturbance caused by a wave.

  4. In the sound wave produced by a vibrating turning fork as shown in the diagram, half the wave length is represented by:

    (a)

    BD

    (b)

    AB

    (c)

    AE

    (d)

    DE

  5. When the pitch of note by a harmonium is lowered, then the wave length of the note

    (a)

    first decreases and then increases

    (b)

    decreases

    (c)

    remains the same

    (d)

    increases

  6. Which of the following are infrasonic waves?

    (a)

    5 kHz

    (b)

    25 Hz

    (c)

    10 Hz

    (d)

    15000 Hz

  7. Speed of sound in solids does not depend upon __________.

    (a)

    temperature

    (b)

    density

    (c)

    medium

    (d)

    pressure

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

    (a)

    Vibration

    (b)

    Rotation

    (c)

    Translation

    (d)

    Linear motion

  9. A small bee produces sound, while it moves, the sound is created due to _____________.

    (a)

    grinding its teeth

    (b)

    Friction due to air

    (c)

    flapping of wings

    (d)

    sound due to its vocal chord

  10. A Sonar device on a submarine send out a signal and receives an echo 5 seconds later. Calculate the speed of sound it water if the distance of the object from the submarine is 3500 m

    (a)

    1440 rns-1

    (b)

    1460 rns-1

    (c)

    1400 ms-1

    (d)

    1550 rns-1

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