Given below are the Class 9 Science 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
- Arrange the speed of sound in Steel, water and air in ascending order?
- What is the relation between frequency and time period of the wave?
- Sound waves are transverse waves True or False?
- Arrange the speed of these waves in air in descending order a) light b) Sound c) Supersonic aircraft?
- What is an echo?
- What are three characteristics of the sound
- What is the audible range of sound frequencies for human ear?
- 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
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
- Do not
- Nature of the material ,temperature
- Reflectors
- Same
- infrasonic
Crossword Solution
Across
Ultrasound,Hertz, Amplitude, Stethoscope, rarefaction
Down
Sonar, Cochlea, infrasonic, Pitch, crest
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Also Read
- Notes
- Assignments
- NCERT Solutions
Class 9 Maths
Class 9 Science
