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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
(Frequency)

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

wavelength

The distance travelled by a wave per second

frequency

The no of complete vibrations per sec            

Velocity

The distance between one crest of wave and next one

Amplitude

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

Frequency

Wavelength

Time period

Audible/Ultrasonic/Infrasonic

330 m/s

550Hz

?

?

?

 

500hz

68m

?

?

343.4m/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

Across

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
Down
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

 

Solution

 

Fill in the blank solution

 

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

 

Crossword Solution

 

Across

Ultrasound,Hertz, Amplitude, Stethoscope, rarefaction

 

Down

Sonar, Cochlea, infrasonic, Pitch, crest

 

 

 

 

 



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