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