21. Which is best used as a sound absorbing material in partition walls ?
22. Speed of sound is the greatest in :
23. The pitch of sound depends on its
24. What apparatus is used to locate a submerged object?
25. A decibel is
26. Sound following a flash of lightning is called
27. Acceptable noise level for human ear
28. Decibel is a term connected with :
29. Decibel is the unit used for
30. The speed of sound in air depends on
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