Question 1 What are metalloids. Give example? Question 2 Write few characteristics of metals? Question 3 write few characteristics of non-metals? Question 4 Give examples of metals? Question 5 Give examples of non-metals? Question 6 How many metals are known to us? Question 7 How many non-metals are known to us? Characteristics of Metals (1) Metals are … [Read more...] about Characteristics of Metals and Non-Metals
Class 8
Elements
Question 1 What are elements? Give example? Question 2 Define the term atom? Question 3 Name 2 types of elements? Elements A substance which cannot be broken down into two or more simpler substances by chemical reactions is called an element. For Example : Iron, hydrogen, helium, oxygen ,phosphorus, sulphur, chlorine, bromine, gold, silver, mercury, aluminium … [Read more...] about Elements
Steps to save environment from plastic waste
Question 1 What are the various ways to save the environment from excessive plastic wastes? Question 2 What is meant by 3 R's principle in context of use of plastics? Question 3 State the ways in which we can avoid the use of plastics? Some of the steps which can be taken to save the environment from plastic waste are: 1) We should try to reduce the use of plastics … [Read more...] about Steps to save environment from plastic waste
Harmful Effects of Plastics
Question 1 How the use of plastic has a bad effect on the environment? Question 2 Explain, why disposal of plastic waste is a major problem. Give reason? Question 3 State whether plastic is biodegradable or non-biodegradable? Question 4 How do carelessly thrown plastic bags affect dirty water drains and sewers? Question 5 How do carelessly thrown plastic bags affect … [Read more...] about Harmful Effects of Plastics
Biodegradable and Non-biodegradable Material
Question 1 What are bio-degradable material? Give example? Question 2 What are non-biodegradable material. Give example? Biodegradable and Non-biodegradable material A material which gets decomposed through natural processes (such as action of bacteria)are called as biodegradable material. For Example : Plant waste, animal waste, paper, cotton, cloth, woolen cloth, … [Read more...] about Biodegradable and Non-biodegradable Material