### Chapter 13 - Sound - 2

 1. If f is frequency and lambda is wavelenth then speed V lf sound can be found by formulaa) V=fl b) V=l2/fc) V=f/ld) V=l/f
 2. SI unit of intensity of sound isa) W/m2 b) Wm2c) Beld) Decibel
 3. Intensity level of loudest sound which can be heard without pain isa) 140db b) 0c) 60dbd) 120db
 4. Pitch of sound depends upona) amplitude b) areac) frequencyd) distance
 5. Speed of sound is greatest ina) steel b) airc) vacuumd) waer
 6. The distance between any two consecutive compression or rarefactions is calleda) frequency b) intensityc) speedd) wavelength
 7. Old people cannot hear sounds of frequencya) 15 KHz b) nonec) below 15 KHzd) above 15 KHz
 8. Sound energy flowing per second through a unit area held perpendicular to the direction of sound waves is calleda) quality b) frequencyc) intensityd) loudness
 9. Audible frequency range isa) 10KHz to 20KHz b) 20Hz to 10KHzc) 20Hz to 20 KHzd) 20KHz to 25KHz
 10. Match the column.................................sound is a form ofa) medium b) comprestionsc) crestsd) energy
 11. Match the column.................................sound is produced bya) vibrations b) compressionsc) crestsd) solids
 12. Match the column.................................sound consits ofa) energy b) compressionsc) mediumd) crests
 13. Match the column.................................sound propagates througha) energy b) crestsc) vibrationsd) medium
 14. Match the column.................................sound moves faster ina) vibrations b) solidsc) energyd) medium
 15. Match the column.................................loudness depends upona) noise b) frequencyc) sound energyd) area vibrating body
 16. Match the column.................................pitch depends upona) sound energy b) frequencyc) noised) area vibrating body
 17. Match the column.................................quality depends upona) sound energy b) area vibrating bodyc) musical soundd) overtones
 18. Match the column.................................intensity depends upona) sound energy b) area vibrating bodyc) frequencyd) noise
 19. Match the column.................................unpleasant effecta) frequency b) area vibrating bodyc) noised) sound energy
 20. Match the column.................................sound of traina) 10 db b) 120 dbc) 100 dbd) 60 db

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