Burning of fuels leads to harmful products

Question 1 Name the poisonous gases produced by incomplete combustion of fuels? Question 2 Name the fuel which is gradually replacing petrol and diesel in automobiles? Question 3 Why LPG is a better domestic fuel than wood? Question 4 What are the disadvantages of burning wood as fuel? Question 5 Why the use of CNG…

Read More

Structure of flame

Question 1 How many zones are there in a flame? Question 2 Which zone of candle is the hottest? Question 3 Which zone of candle is the coldest? Question 4 What is the colour of inner most flame? Question 5 What is the colour of outer most flame? Question 6 Name the various zones of candle flame?…

Read More

Flame

Question 1 what is a flame? Question 2 What type of substances,on burning give a flame? Question 3 Name few substances which produces flame? Question 4 What happen when magnesium ribbon is burnt? Question 5 Charcoal does not burn by producing a flame.Why? Question 6 How luminous flame is produced? Question 7 How non-luminous flame…

Read More

Fire control

Question 1 Name the most common fire extinguisher? Question 2 Which fire extinguisher is used for fires involving electrical equipments and inflammable materials? Question 3 What is fire fighting? Question 4 Why are fire produced by burning oil and petrol cannot be extinguished by using water? Question 5 Why fires caused by the electrical short circuit…

Read More

Fuels

Question 1 Name the unit in which calorific value of a fuel is expressed? Question 2 Name few solid fuels? Question 3 Name few liquid fuels? Question 4 Name few gaseous fuels? Question 5 Define the term calorific value of fuels? Question 6 What are the characteristics of ideal fuel? Question 7 The calorific value…

Read More

Types of combustion

Question 1 What is meant by rapid combustion.Give example? Question 2 What is meant by spontaneous combustion.Give example? Question 3 What is explosive combustion.Give example? Types of combustion The three important types of combustion are: 1)Rapid combustion 2)Spontaneous combustion 3)Explosive combustion Rapid combustion The combustion reaction in which a large amount of heat and light…

Read More

Lightning of matchstick

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…

Read More

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

Combustion

Question 1Define 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 place? Question 7 What happens…

Read More