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What is the cause of an echo? What is th...

What is the cause of an echo? What is the minimum distance of the obstacle from the source of sound for hearing distinct echo?

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MBD -HARYANA BOARD-SOUND-Example
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  6. What is the relation between frequency and time period of a wave ?

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  7. On dropping a pebble in still water, what type of waves are produced o...

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  8. What kind of waves are sound waves produced in air ?

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  9. What is the full form of SONAR? Explain its working

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  10. Name the instrument used to measure and record an earthquake.

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  11. Which scale measures the intensity of earthquake measured ? Who develo...

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  12. Earthquake of what intensity is considered safe on Richter Scale.

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  13. What is the cause for production of sound ? Can sound propagate in vac...

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  14. What is the time for persistence of hearing ?

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  15. What is the velocity of sound on moon ?

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  16. Which animal can hear infrasonics ?

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  17. What is meant by audible range for human beings ? Give its frequency r...

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  18. What is the cause of an echo? What is the minimum distance of the obst...

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  19. Which has a higher pitch, whistle or a drum ?

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  20. A violin and a sitar may have the same frequency, yet we can distingui...

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