Question 1 What is meant by luminous object? Give example? Question 2 What is meant by non-luminous objects? Give example? Question 3 Define the term reflection of light? Question 4 What is meant by incident ray? Question 5 What is meant by reflected ray? Question 6 What do you mean by point of incidence? Question 7 Define the angle of incidence? Question 8 … [Read more...] about Reflection of Light
Class 8
Earthquake
Question 1 What is an earthquake? Question 2 Define the term epicentre and focus of an earthquake? Question 3 What are the main situations in which earthquake occurs? Question 4 What are the various effects of an earthquake? Question 5 Name the three layers of earth? Question 6 What is a seismograph? Question 7 What precautions should be taken by people living … [Read more...] about Earthquake
Lightning
Question 1 How is lightning produced between clouds in the sky? Question 2 Why does lightning usually strike tall building? Question 3 How does a lightning conductor protects a tall building? Question 4 Why are lightning strikes more frequent in hilly areas? Question 5 Name the materials of which a lightning conductor is made? Question 6 What is a lightning … [Read more...] about Lightning
Electric charges
Question 1 What are the two kinds of electric charges? Question 2 Why does a plastic comb rubbed with dry hair attract tiny pieces of paper? Question 3 What is lightning? Question 4 Explain why a charged balloon is repelled by another charged balloon? Question 5 Explain why a god rod can be charged by rubbing when held in hand but an iron rod cannot be charged by … [Read more...] about Electric charges
Uses of Electroplating
Question 1 Name two metals which are usually electroplated on cheaper metals for making jewellery? Question 2 What properties of chromium make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebar? Question 3 What properties of tin make it suitable for storing food? Question 4 Which is the polluting waste generated by electroplating … [Read more...] about Uses of Electroplating