Class 9 Sound Quiz Set 1

1. The number of compressions or rarefactions per unit time gives


2. When the vibrating object moves backwards, it creates a region of low pressure called ______


3. Note is a sound


4. When a body vibrates, it compresses the air surrounding and forms a high-density area known as ______


5. Children under the age of 5 can hear upto


6. Sound waves in air is an example of ______


7. When we change feeble sound to loud sound we increase its


8. Speed of sound depends upon


9. Sound travels in air if


10. Infrasound can be heard by


11. The phenomenon where a sound produced is heard again due to reflection is called _____


12. A wave in slinky travelled two and fro in 5 sec the length of the slinky is 5 m. What is the velocity of wave?


13. In SONAR, we use


14. Earthquake produces which kind of sound before the main shock wave begins


15. In the curve half the wavelength is



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