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