Sound Worksheet-10

Sound Worksheet-10

21. Human ear cannot hear sound waves of frequency above____.

22. Sound waves of frequencies below 20 Hz are called ____.

23. Sound waves of frequencies above 20,000 Hz are called____.

24. In wind instrument sound is produced by vibrating ______ inside the instrument.

25. In percussion instrument sound is produced by vibrating_____.

26. Unpleasant, discomfort-causing sound from any source is called _____.

27. Sustained presence of harmful, unwanted or annoying noise in the environment is called_____.

28. A harmonica is a ______instrument.

29. A dholak is a _____instrument.

30. ____ stands for Sound Navigation Ranging.

31. Loudness is determined by the _____ of vibration. (amplitude)

32. Sound cannot travel through _____.

33. The number of oscillations per second of a wave is called _____

34. Shrillness of a sound is associated with ______

35. Unwanted , discomfort – causing sound from any source is called ______

36. A guitar is a ____.

37. Match the following:

38. Match the following:

Answer:

21. 20,000 hertz

22. infrasonic wave

23. ultrasonic waves

24. air column

25. membrane

26. noise

27. noise pollution

28. wind

29. percussion

30. Sonar

31. amplitude

32. Solid

33. Frequency

34. pitch

35. noise

36. stringed

37. A–S, B–P, C–T, D–Q, E–R

38. A–R, B–P, C–Q, D–T, E–S