Olympiad – Class VIII – Science - Phy - Sound

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Question - 1

When we say that sound travels in a medium, what do we mean?

  • A The particles of the medium travel.
  • B The source travels.
  • C The disturbance travels.
  • D The medium travels.

Question - 2

Which of the following correctly represents the speed of sound in solids, liquids and gases in ascending order?

  • A Gas> liquid> solid
  • B Liquid> gas> solid
  • C Liquid> solid> gas
  • D Gas> liquid> gas

Question - 3

A person can hear an approaching train when he presses his ear to the railway track faster than one who simply stands on the tracks. What makes this possible?

  • A The vibration of railway tracks
  • B The vibration of air
  • C The speed of sound in solids is more
  • D The hearing ability of the man

Question - 4

A person can be identified by his voice. What determines this distinguishing feature?
(i) Amplitude
(ii) Pitch
(Hi) Loudness

  • A Only (i)
  • B Only (ii) and (iii)
  • C Only (i) and (iii)
  • D (i), (ii) and (iii)

Question - 5

In human beings, which of the following produces the sound?

  • A Larynx
  • B Wind pipe
  • C Eardrum
  • D Lungs

Question - 6

An object oscillates 50 times in one second. What is its frequency?

  • A 0.2 Hz
  • B 0.02 Hz
  • C 0.002 Hz
  • D 50 Hz

Question - 7

In which of the three media does sound travel the fastest?

  • A Air
  • B Water
  • C Steel
  • D Speed is same in any medium

Question - 8

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why?

  • A The speed of sound is greater than the speed of light.
  • B The speed of sound is equal to the speed of light.
  • C The speed of light is greater than the speed of sound.
  • D All of the above.

Question - 9

What is the cause for the difference in the voices of men, women and children?

  • A Difference in larynx
  • B Difference in lungs
  • C Difference in vocal cords
  • D Difference in wind pipe

Question - 10

Which of the following represents Hertz?

  • A Second
  • B Second-1
  • C Metre
  • D Metre -1