Class 9 Sound Quiz Set 1 1. 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? 20 m/s 10 m/s 5 m/s 2 m/s 2. Earthquake produces which kind of sound before the main shock wave begins None of these Audible sound Ultrasound Infrasound 3. The number of compressions or rarefactions per unit time gives Amplitude Time period Pitch Frequency 4. In SONAR, we use audible sound waves radio waves ultrasonic waves infrasonic waves 5. Note is a sound of mixture of several frequencies of mixture of two frequencies only always unpleasant to listen of a single frequency 6. Sound travels in air if there is no moisture in the atmosphere disturbance moves both particles as well as disturbance travel from one place to another. particles of medium travel from one place to another 7. Infrasound can be heard by Dog Rhinoceros Human Horse 8. When we change feeble sound to loud sound we increase its frequency amplitude wave length velocity 9. When a body vibrates, it compresses the air surrounding and forms a high-density area known as ______ Reflection Rarefaction Compression Refraction 10. Speed of sound depends upon Pressure of the medium Temperature and pressure of medium Temperature of source producing sound Temperature of the medium 11. The phenomenon where a sound produced is heard again due to reflection is called _____ Echo Mirage Sound bounce Interference 12. Sound waves in air is an example of ______ Transverse wave Electromagnetic wave Longitudinal wave None of these 13. Children under the age of 5 can hear upto 20 Hz 20 K Hz 25 K Hz 25 Hz 14. When the vibrating object moves backwards, it creates a region of low pressure called ______ Reflection Rarefaction Retardation Refraction 15. In the curve half the wavelength is AB DE BD AE Loading …
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