JK Academy Std 6 Science Lesson 13 Sound questions and answers
Exercise 1. Fill in the blanks with the proper words. (a) The propagation of sound does not occur through a vacuum. (b) Noise pollution is a social issue. (c) The sound which is disagreeable to the ears is called noise. (d) Noise has adverse effects on our health. 2. What should we do? (a) The silencer of a motorcycle is …