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Q.1 Name a few fuels used in our homes.
Q.2 Name a few fuels used in trade and industry.
Q.3 What fuels are used for running automobiles?
Q.4 What is the difference between the burning of a candle and burning of a fuel like coal?
Q.5 What is combustion?
Q.6 Define a fuel?
Q.7 (i) What are the essential condition required for combustion?
     (ii) What is the essential condition required for extinguishing fire?
Q.8 What are inflammable substance?
Q.9 In what form is LPG stored in cylinders?
Q.10 Name the most common fire extinguisher?
Q.11 Water is not suitable for fires involving electrical equipment oil and petrol. Why?
Q.12 Explain how CO2 is able to control fires?
Q.13 What are the requisites (qualities) of a good (ideal) fuel?
Q.14 Explain the following terms:-  (i) Global warming (ii) Acid rain
Q.15 Suppose you are asked to boil a given quantity of water using cow dung cake, coal and LPG as fuels. Which fuel would you prefer? Give your reason.
Q.16 Define calorific value of a fuel. Though hydrogen has got highest calorific value but it is not used as a domestic fuel. Why?
Q.17 Make a labeled diagram of a candle flame.
Q.18 Name various types of combustion. Give example of each type?
Q.19 In an experiment 10 Kg of a fuel  produced 200,000 KJ 0f heat . Calculate the calorific value of the fuel.
Q.20.How does CO2 help in fire fighting?
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1. What is combustion?
Ans. Combustion is a chemical process in which a substance reacts with oxygen, releasing heat and light. It is also known as burning and is a form of oxidation-reduction reaction.
2. How does combustion occur?
Ans. Combustion occurs when a substance combines with oxygen in the presence of heat to produce carbon dioxide, water, and heat. This process is exothermic, meaning it releases energy in the form of heat and light.
3. What are the different types of flames?
Ans. Flames can be categorized into three types: a) Luminous flame, which is yellow and produces sooty smoke, b) Non-luminous flame, which is blue and does not produce sooty smoke, and c) Candle flame, which is a combination of both luminous and non-luminous flames.
4. What is the role of a fire extinguisher in controlling combustion?
Ans. A fire extinguisher is a device used to control and extinguish fires. It works by removing one or more essential components required for combustion, such as heat, fuel, or oxygen. Different types of fire extinguishers are designed for specific classes of fires, such as water extinguishers for Class A fires (involving ordinary combustible materials) and carbon dioxide extinguishers for Class B fires (involving flammable liquids).
5. How does the concept of ignition temperature relate to combustion?
Ans. Ignition temperature is the minimum temperature at which a substance starts burning. It is the temperature at which combustion is initiated and sustained without any external source of heat. If the temperature of a substance is below its ignition temperature, it will not burn. However, once the substance reaches or exceeds its ignition temperature, it will undergo combustion.
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