Class 8 | Science | Ch 16 |Pollution of Air and Water| NCERT Solutions 1. What are the different ways in which water gets contaminated ? Answer: Water gets contaminated by : a) Sewage waste: Waste material from toilet, kitchens, laundry which are discharged in water without proper treatment causes its contamination. b) Industrial dispose: Harmful and poisonous … [Read more...] about Chapter 18 Pollution of Air and Water
Class 8
Chapter 15 Some Natural Phenomena
Class 8 | Science | Ch 15 |Some Natural Phenomena| NCERT Solutions Select the correct option in Questions 1 and 2. 1. Which of the following cannot be charged easily by friction? (a) A plastic scale (b) A copper rod (c) An inflated balloon (d) A woollen cloth. Answer: (b) A copper rod 2. When a glass rod is rubbed with a piece of silk cloth the rod (a) and the … [Read more...] about Chapter 15 Some Natural Phenomena
Chapter 16 Light
NCERT Solutions for Chapter 16 Light Class 8 1. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain. Answer: An object becomes visible when light reaches our eyes after being reflected from the object.If we are in dark room, then it is not possible for us to see the objects because no light is reflected from the … [Read more...] about Chapter 16 Light
Chapter 14 Chemical Effects of Electric Current
Class 8 | Science | Ch 12 |Chemical Effects of Electric Current| NCERT Solutions 1. Fill in the blanks. (a) Most liquids that conduct electricity are solutions of , _______ and ________. (b) The passage of an electric current through a solution causes __________ effects. (c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected … [Read more...] about Chapter 14 Chemical Effects of Electric Current
Chapter 13 Sound
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