1. Sounds travels faster in air as compared to water.   True   False   2. The three little bones in the middle ear are the _______, the anvil and the stirrup.   hammer   cochlea   eardrum   Hint Half-n-half Clue   3. The number of sound vibrations per second is called _______.   time period   amplitude   frequency   Half-n-half Clue   4. Out of the following materials, the best conductor of sound is _______.   Water   Steel   Air   Half-n-half Clue   5. The process by which sound vibrations are produced in pipes is known as _______.   rarefaction   resonance   reflection   refraction   Half-n-half Clue   6. An echo from the sea-bed is received 1.50 s after an ultrasonic vibration is sent from a sonar on a ship. If the speed of sound in water is 1500 m/s, then the depth of the sea is _______.   1000 m   1125 m   2250 m   4500 m   Half-n-half Clue   7. A _______ note is the lowest note obtained on blowing gently across the top of a test-tube.   fundamental   overtone   harmonic   Half-n-half Clue