1. WHAT AM I?

6. What characteristic of sound helps us to identify sources of sound?

8. What are the different factors affecting the pitch of a sound?

10. How is frequency and pitch related?

12. What are the characteristics of sound?

17. Valuing

18. Sound can be pleasant or unpleasant. Noise is categorized as an unpleasant sound. Most countries are now affected not only by air pollution . Both are harmful to one’s health. For instance, noise caused by the honking of horns, shrilling voices and scuffling of feet can aggravate a sick person’s condition. Scientists have found out that people get more work done in quiet places than in noisy areas. In fact, a person can do 25% more work in a quiet room. Knowing all these:

20. Assessment

31. HAPPY HEARTS DAY!