Welcome to your Sound Waves(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The bats can fly in the darkness of night without colliding with the other objects by emitting special sounds while flying. Which characteristic sound is used by the bats to navigate? Ultrasound None of these Infrasound Audible sound 2. The sound can travel in air when: Particles of medium travel from one place to another There is no moisture in the atmosphere Disturbance move Both particles as well as disturbance travel from one place to another 3. You must have seen the doctor checking the sounds produced in the chest or heart beat of a patient using a medical instrument called Stethoscope. On what principle does this Stethoscope work? Multiple reflections Wave motion None of these Multiple refractions 4. What type of waves are Sound Waves? Longitudinal waves Latitudinal waves Latitudinal mechanical waves Longitudinal waves 5. The loudness or softness of a sound is _____________ Volume Sound Pitch 6. A movement back and forth that produces sound is called _____________ Sound Air Vibration 7. In this animation what kind of interference is shown? Reflection Constructive Refraction Destructive 8. We can easily distinguish between the sounds of the different singers even without having seen them. This is all due the different quality or timber of their sounds. On what factor does the quality of sound depend? Wave amplitude Wavelength Wave frequency Waveform 9. A key of mechanical piano is first struck gently and then struck again but much harder this time. What kind of change in sound will you observe in the second case: Sound will be louder but the pitch will not be different Both loudness and pitch will remain unaffected Sound will be louder and the pitch will also be higher Sound will be louder but the pitch will be lower 10. Loudness measures the sound energy reaching the ear per second and depends on the amplitude of the sound wave. What is the unit used to measure the loudness of sound? Hertz Decibel Second Meter/second 11. If the frequency of the wave is lowered, what happens to the speed of the sound wave? Sound wave slows down Sound wave speed does not change Sound wave speeds up All of the above 12. Which of the following is/ are not applications of Ultrasonic Waves?(a) For measuring the depth of Sea.(b) In sterilizing of a liquid.(c) In Ultrasonography(d) In sterilizing a needle. Both (a) and (b) Only (b) Only (d) Both (c) and (d) 13. Sound waves are longitudinal waves which have _________________ and rarefactions. None of the above Compressions Crests Troughs 14. In this animation, what type of wave is shown? Longitudinal Transverse Refracted Light 15. The speed at which a wave travels. Wave Speed Wave length Doppler effect Wave height 16. Which of the following is not a type of electromagnetic wave? Gamma rays Radio waves Sound Red light 17. What is the speed of sound in air? 332 m/s 336 m/s 330 m/s 334 m/s 18. The type of wave shown is a __________ wave. Longitudinal Sound Transverse Light 19. If the speed of a wave is 380 m/s and its frequency is 1900 Hz, then the wavelength of the wave will be: 2 m 20 m 200 m 0.2 m 20. What is the unit of loudness? Decibel Phon Bel All of the above 21. We can distinguish between a man's voice and a woman's voice of the same loudness even without seeing them. This is due to a characteristic of sound which measures the shrillness of sounds. Can you choose the correct unit of the quantity on which this characteristic of sound depends? Meter Meter/second Hertz Unitless 22. On increasing the temperature, the speed of sound in air: Increases First increases then becomes constant Does not change Decreases 23. Which of the following can produce longitudinal as well as transverse waves under different conditions? Slinky Tuning fork None of these Bats 24. All waves except __________ waves must travel through a medium. Water Sound Compressional Light 25. Before the main shock waves, the earthquake produces the characteristic sound waves which some animals like rhinoceros can hear. Can you guess the kind of sound waves produced here? Infrasonic sounds Ultrasonic sounds Audible Sounds None of these 1 out of 25 Time is Up! Time's up