Question 1 What is a matchstick? Question 2 A matchstick does not catch fire and burn on its own.Why? Question 3 Kerosene oil and wood do not catch fire on their own at room temperature.Why? Question 4 Can u burn a piece of wood by bringing a lightened matchstick near it.Explain? Question 5 Cooking oil in a frying pan catches fire when the frying pan is kept over a … [Read more...] about Lightning of Matchstick
Class 8
Conditions necessary for combustion
Question 1 Define the term ignition temperature of a substance? Question 2 Which of the two has lower ignition temperature:Kerosene or petrol? Question 3 Name 2 substances having low ignition temperature? Question 4 Name 2 substances having high ignition temperature? Question 5 What are the conditions necessary for combustion to take place? Question 6 What are … [Read more...] about Conditions necessary for combustion
Combustion
Question 1 Define the term combustion? Question 2 What are fuels. Name 2 fuels? Question 3 What are combustible substances. Give example? Question 4 What are non-combustible substances. Give example? Question 5 Can the process of rusting of iron be called combustion. Give reason for answer? Question 6 What happens when combustion of magnesium takes … [Read more...] about Combustion
Petrochemicals
Question 1 What are petrochemicals? Give example ? Question 2 Why petrochemicals are important? Question 3 What is black gold? Question 4 What is a major cause of air pollution? Question 5 Write the various steps for minimising the wastage of petrol or diesel while driving? Question 6 Why should we use fossil fuels only when absolutely … [Read more...] about Petrochemicals
Natural Gas
Question 1 What is the composition of natural gas? Question 2 Name the places in India where natural gas is found? Question 3 Describe how natural gas is formed? Question 4 What are the advantages of natural gas as a fuel? Question 5 State the various uses of natural gas? Question 6 What is CNG? Natural Gas It consist mainly of methane with small quantities … [Read more...] about Natural Gas