Olympiad – Class IX – Science - Phy - Sound

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Question - 1

A mechanical wave travels in a medium. Which of the following quantities is transferred from one place to another with the wave?

  • A Mass
  • B Speed
  • C Density
  • D Energy

Question - 2

On a slinky, which of the following is produced?

  • A A longitudinal wave but not a transverse wave 
  • B A transverse wave but not a longitudinal wave
  • C A longitudinal wave as well as a transverse wave
  • D Neither a longitudinal nor a transverse wave

Question - 3

In which of the following media can nonmechanical waves travel

  • A In vacuum as well as in a medium
  • B In vacuum but not in a medium
  • C In a medium but not in vacuum
  • D Neither in a medium nor in vacuum

Question - 4

What is the distance between a crest and a trough in a wave

  • A
  • B \(\frac { 入 }{ 2 } \)
  • C \(\frac { 入 }{ 4 } \)
  • D B入

Question - 5

A wave source produces 20 crests and 20 troughs in 0.2 s. Find the frequency of the wave.

  • A 200 Hz
  • B 500 Hz
  • C 100 Hz
  • D 300 Hz

Question - 6

The time period of a periodic wave is 0.02 seconds. At a particular position there is a crest at t = o.At what value of't' will the next trough appear at this position

  • A 0.05 s
  • B 0.01 s
  • C 0.15 s
  • D 0.25 s

Question - 7

A longitudinal wave travels from east to west in air. In which direction do the particles of air move?

  • A East to west
  • B East to west and north to south
  • C North to south
  • D South to north

Question - 8

A long spring is fixed at one end. A person holding the other end compresses the spring with a jerk. The compression travels along the length of the spring. Which kind of wave is travelled along the length of the spring?

  • A Electromagnetic waves
  • B Transverse waves
  • C Longitudinal waves
  • D Both (A) and (e)

Question - 9

Which of the following statements is NOT correct?

  • A The characteristic of sound that distinguishes a shrill noise from a grave one is called pitch.
  • B Pitch is not frequency, but it changes with frequency.
  • C The voice of a girl is shriller than that of a boy.
  • D The roaring of a lion is shriller than the buzz of an insect

Question - 10

Find the time period of a wave whose frequency is 400 Hz

  • A 0.0012 s
  • B 0.0025 s
  • C 0.0015 s
  • D 0.0010 s