Class 9 | Science | Chapter 13| Why do we fall ill | NCERT Solutions Page 178 1. State any two conditions essential for good health. Answer: Health is a state of complete physical, mental and social well being. The two conditions essential for good health are 1) We need food for health and food will have to earn by doing work.For this, opportunity to do work … [Read more...] about Chapter 13 Why do we fall ill ?
Class 8 | Science | Ch 13 |Friction| NCERT Solutions 1. Choose the correct answer. Sound can travel through (a) gases only (b) solids only (c) liquids only (d) solids, liquids and gases. Answer: (d) solids, liquids and gases 2. Voice of which of the following is likely to have minimum frequency? (a) Baby girl (b) Baby boy (c) A man (d) A woman Answer: (c) A … [Read more...] about Chapter 13 Sound