Tag Archives: science notes

SOURCES OF ENERGY

Sources of Energy QUES.1 What are Sources of energy? Ans. 1  A substance that provides us with energy in the form of heat,light etc. is  known as sources of energy. E.g Coal, petroleum, wood. Ques.2 State various types of sources of energy. Difference between them? Ans.2 Renewable Non-Renewable These are called alternative sources of energy… Read More »

ACID BASES AND SALTS

Acids, Bases and Salts   Ques.1 What are acids and bases? Ans.1 Solution that produce hydrogen ions and turn blue litmus are red called acids. Solution that produce hydroxide ions and turn red litmus blue are called bases. Ques.2 What are the physical properties of acids and bases? Ans.2 (a)  Acids- most acids are colourless.… Read More »