Q21. What is the length of the vocal cord in men and women?

 

Q22. What does the working of a toy telephone tell us about sound?

 

Q23. Who produces sound of higher pitch: a man or a woman? Why?

 

Q24. Name three characteristics which are used to describe oscillations.

 

Q25. What is musical sound? Give example.

 

Q26. What is noise pollution?

 

Q27. What is amplitude of oscillation?

 

Q28. Why can ultrasound not be heard by humans?

 

Q29. Why a sound cannot be heard on the moon?

 

Q30. Why should we not put a sharp, pointed or hard thing into our ears?

 

Q31. How is sound produced in mridangam?

 

Q32. What is the relation between 'time-period' and 'frequency' of an oscillating body?

 

Q33. What differences will you hear in a sound if there is an increase in (i) amplitude, and (ii) frequency?

 

Q34. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

 

Q35. Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain?

 

Q36. Name one solid, one liquid and one gas through which sound can travel.

 

Q37. Whose voice is more shriller: a baby or a woman?

 

Last modified: Sunday, 8 September 2019, 4:19 PM