Class 9 Science|physics Important Questions for Sound

Given below are the Class 9 Maths Important Questions for Sound

a) Concepts questions
b) Calculation problems
c) Multiple choice questions
d) Long answer questions
e) Fill in the blank's

Short Answer Based questions

  1. Arrange the speed of sound in Steel, water and air in ascending order?
  2. What is the relation between frequency and time period of the wave?
  3. Sound waves are transverse waves True or False?
  4. Arrange the speed of these waves in air in descending order   a) light  b) Sound c) Supersonic aircraft?
  5. What is an echo?
  6. What are three characteristics of the sound
  7. What is the audible  range of sound frequencies for human ear?
  8. What is Reflection of sound?

Match the column


Column A

Column B

(Sound range they fall)

5 Hz

Audible range

25000 Hz

Infrasonic range

25 Hz                                                            

Ultrasonic range

250 Hz


10 Hz


120000 Hz



Match the column


Column A

Column B


The maximum disturbance caused by the wave


The distance travelled by a wave per second


The no of complete vibrations per sec            


The distance between one crest of wave and next one


When we change a feeble sound to loud sound, we increase its

Time period

When we change the pitch, what is getting changed



Table type question


Sound velocity



Time period


330 m/s












1.7 cm




Fill in the blanks

1)Sound waves   ……  travel in vacuum

2)The speed of sound depends on   ………….  And  …………

3)The soft and porous materials are bad  ………. Of sound

4)The speed of the highly penetrating ultrasonic waves are   …………………..  those of audible sound waves

5) The ……….. sound are produced before the main shock wave of earth quake

crossword puzzle for sound for class 9

Crossword Puzzle


4. It is used break kidney stones into fine grains
7. The unit of frequency
8. The loudness of the sound depends on this
9. Medical instrument used by the doctors for listening to heartbeats
10. It is the region of low pressure in longitudinal wave
1. Apparatus used to find the depth of the sea
2. It converts sound wave frequency into electrical impulses
3. A vibrating simple pendulum produces this type of sound
5. It is the sensation of a frequency
6. Elevation in a transverse wave




Fill in the blank solution


  1. Do not
  2. Nature of the material ,temperature
  3. Reflectors
  4. Same
  5. infrasonic


Crossword Solution



Ultrasound,Hertz, Amplitude, Stethoscope, rarefaction



Sonar, Cochlea, infrasonic, Pitch, crest






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