1) Which of the following is an Electrical Conductor? a) Copper b) Rubber c) Glass d) Plastic 2) Which of the following is an Electrical Conductor? a) Aluminum b) Wood c) Iron d) Water 3) When an object vibrates...It produces? a) Sound waves b) Vibrate c) Matter d) Waves 4) What is coal? a) natural b) man-made 5) What is tension? a) pulls apart b) squeezes together 6) Sound travels.... a) 330ms in the air b) 220ms in the air c) 110ms in the air d) 440ms in the air 7) Sound is a form of energy that... a) spreads from its source in all directions b) a medium for its propagation gas, liquid and solids 8) Sound vibration travels faster through... a) solids than in air b) gas than solids 9) When the object stops vibrating,the sound stops a) the particle around it vibrates as well b) the particle makes sound waves 10) Sound travels___times faster in water a) 4 b) 5 c) 6 d) 7

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