Pre-Quiz: Sound

15 Questions
Pre-quiz: Sound

Take 10 mins to complete the Quiz. There are 15 MCQ Questions to this Pre-Quiz.

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Questions and Answers
  • 1. 
    The regions of compressions and rarefactions of a sound wave are established because
    • A. 

      The sound wave undergoes diffraction behind obstacles.

    • B. 

      The reflected sound wave at the fixed end interferes with the incident wave.

    • C. 

      The speed of the sound wave changes as it travels through a medium.

    • D. 

      The longitudinal movement of air molecules produces pressure fluctuations.

  • 2. 
    The wavelength of a sound wave is 1.5 m, the distance between a compression and the nearest rarefaction is 
    • A. 

      0.75 m

    • B. 

      1.50 m

    • C. 

      2.25 m

    • D. 

      3.00 m

  • 3. 
    Which of the following is not a characteristic of mechanical waves?
    • A. 

      They transport energy.

    • B. 

      They are created by vibrating sources.

    • C. 

      They do not transfer matters.

    • D. 

      They are all transverse waves.

  • 4. 
    The property which distinguishes longitudinal waves from transverse waves is the         
    • A. 

      Wavelength

    • B. 

      Ability to be refracted

    • C. 

      Need for a material medium

    • D. 

      Relative directions of oscillation and propagation

  • 5. 
    When a sound wave and light wave re similar in that both ______.
    • A. 

      Are produced by mechincal vibrations

    • B. 

      Are longitudinal wave

    • C. 

      Can travel through vacuum

    • D. 

      Obey the laws of reflection

  • 6. 
    A star in our galaxy has exploded. Which one of the following could NOT reach Earth?
    • A. 

      Infra-red radiation

    • B. 

      Light

    • C. 

      Sound

    • D. 

      X-rays

  • 7. 
    Which of the following sequence of speed of the sound in ascending order is correct?
    • A. 

      Speed of sound in oxygen, speed of sound in mud, speed of sound in water.

    • B. 

      Speed of sound in ice, speed of sound in stone, speed of sound in alcohol.

    • C. 

      Speed of sound in orange juice, speed of sound in iron, speed of sound in air.

    • D. 

      Speed of sound in steam, speed of sound in ink, speed of sound in iron.

  • 8. 
    The “middle C” on the piano has a frequency of 256 Hz.  Given that the speed of sound is 340 m/s, which of the following shows the correct working to calculate the wavelength?
    • A. 

      340/256

    • B. 

      256/340

    • C. 

      340x256

    • D. 

      1/340x256

  • 9. 
    The frequency of a sound in an 8 m long metal rod is 250 Hz. There are two completed sound waves in the rod. The speed of sound in this metal is
    • A. 

      250 m/s

    • B. 

      500 m/s

    • C. 

      750 m/s

    • D. 

      1 000 m/s

  • 10. 
     An audio generator produces the two pure notes A and B  as shown. Which of the following statements about A and B is incorrect?
    • A. 

      B is softer than A.

    • B. 

      Pitch of A is higher than B.

    • C. 

      Frequency of B is higher than A.

    • D. 

      A and B has the same speed.

  • 11. 
    The cone of a loud speaker is vibrating to and fro and a sound is heard. If the cone is now made to vibrate with a bigger amplitude, which of the following will change?
    • A. 

      Pitch of sound only

    • B. 

      Speed of sound only

    • C. 

      Loudness of sound only

    • D. 

      All the three above

  • 12. 
    Which of the following shows the effect on the wavelength and velocity of the sound waves when a vocalist changes from singing a low note to a high note?             wavelength               velocity       A   increases                   increases       B    remains the same   increases       C    increases                  remains the same       D    decreases                 remains the same
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 13. 
     When a teacher is talking in an enclosed air-conditioned classroom, the students do not hear the echo because
    1. wall is not big enough
    2. sound travel too fast
    3. the sound energy is absorbed by students and furniture.
    • A. 

      (1) and (2)

    • B. 

      (1) and (3)

    • C. 

      (2) and (3)

    • D. 

      all the above

  • 14. 
    What is the audible range of audible frequencies for the human ear?  
    • A. 

      1Hz to 2KHz

    • B. 

      20Hz to 20KHz

    • C. 

      2KHz to 20KHz

    • D. 

      100KHz to 200Khz

  • 15. 
    An observer sees a lightning flash during a thunderstorm. He hears the thunder 6 seconds later. Approximately how far away is the observer from the lightning if the speed of sound is 330 m/s?
    • A. 

      0.50 km

    • B. 

      2.0 km

    • C. 

      55 km

    • D. 

      0.33 km