1. In what forms do fuels occur?
VERY SHORT ANSWER QUESTIONS
2. Why do we consider food as a fuel for our body?
What material was used in ancient Egypt to make match sticks?
4. Kerosene oil does not catch fire on its own when kept at room temperature, the
Ś. What is the basic principle on which a fire extinguisher works?
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What is the colour of the flame of (a) a candle (b) a LPG burner
What health hazards are associated with the burning of carbon fuel?
Which substances burn with flames?
Which zone of a candle flame is (a)luminous (b) non luminous
3.
5. Give two examples of inflammable substances?
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1. Fuels occur as fossils deep Inside the earth.
2. We consider it as a fuel because it helps us in all the metabolic processes as well as locomotion, just like a car needs fuel to move
3.white pine and aspen
4. Yes, this is because kerosene is not flammable at room temperature. That is why metals such as sodium and lithium are stored under it.
5. It works on the principle of cutting off supply of oxygen
6. a) orange-yellow flame b) blue
Luminous- middle zone above the wick
Non luminous- the wick and the unburnt wax
7. Inflammable substances- aerosols and lpg
2. We consider it as a fuel because it helps us in all the metabolic processes as well as locomotion, just like a car needs fuel to move
3.white pine and aspen
4. Yes, this is because kerosene is not flammable at room temperature. That is why metals such as sodium and lithium are stored under it.
5. It works on the principle of cutting off supply of oxygen
6. a) orange-yellow flame b) blue
Luminous- middle zone above the wick
Non luminous- the wick and the unburnt wax
7. Inflammable substances- aerosols and lpg
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