Sound is a longitudinal wave, which required a medium to travel. Sound is the vibration which moves parallel to the direction of the wave and the absolute intensity of sound is expressed in watts per meter. The SI unit of sound and loudness is decibels. There is a relative motion between a sound source and a listener, the listener may hear the frequency of the sound differently from its actual frequency, this is called the "Doppler effect". Let's test yourself with a Sound trivia quiz.
1. Sound waves travel faster in ...
A. Water
B. Air at room temperature
C. Space
D. Steel
2. What type of waves are Sound waves?
A. Latitudinal waves
B. Longitudinal waves
C. Both of them
D. None of them
3. Which one is not the application of Ultrasonic waves?
A. For measuring the depth of Sea
B. In sterilizing of a liquid
C. In Ultrasonography
D. In sterilizing a needle
4. What is the speed of sound in air?
A. 330 m/s
B. 332 m/s
C. 334 m/s
D. 336 m/s
5. Name the characteristic of the sound which distinguishes a sharp sound from a grave or dull sound.
A. Intensity
B. Echo
C. Pitch
D. Resonance
6. Due to which phenomena sound is heard at longer distances in nights than in day?
A. Reflection
B. Refraction
C. Interference of sound
D. Diffraction of sound
7. What is the unit of loudness?
A. Bel
B. Phon
C. Decibel
D. All of the above
8. Sound waves of more than 20,000 waves per second are called...
A. Ultrasonic
B. Subsonic
C. Supersonic
D. Audible
9. Which part of human ear converts sound vibrations into electrical signals?
A. Hammer
B. Stirrup
C. Tympanic membrane
D. Cochlea
10. The reverberation of sound is used in ...
A. Stethoscope
B. Trumpets
C. Megaphone
D. All of these
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