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17. Which object possesses the greatest tendency to create a loud sound? a. Birds b. cellphone c. jet plane d. vehicle 18. Which of the following characteristics that affects the pitch of sound waves? a. Amplitude b. frequency c. quality d. wavelength 19. Which statement is true about how loudness of sound varies with the person? a. A very loud sound may destroy eardrums b. Loud and soft sounds depend upon the source of sound C. A rock music may be pleasant to a teenager but unpleasant to an old lady d. A loud sound is created by a large energy carried by the sound wave 20. How can we identify the voice of our mother even without seeing her? a. Mother always talks that makes us remember their voice. b. The voice of our mother has a high pitch that makes it easy to recognize. c. Our mother creates a very loud sound that enables us to easily identify her voice d. The voice of our mother has its distinct characteristics that distinguishes her voice from others. 21. What type of sound waves do whale produced to communicate with each other deep in the ocean? a. Audible sound b. infrasonic sound c. ultrasonic sound d. unpleasant sound 22. Why is it important for humans to protect the ear against very intense or loud sound? a. The human ears have certain limit that can withstand only certain intensity of sound b. Loud sound can create permanent damage to the nerves in the ear C. The loud sound may cause some brain damage d. All of the above 23. Which of the following is a luminous object? a. Headlight b. mirror c. planet d. rock
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