Q1 of 22 Page 143

which of these is a fossil fuel?

Fossil fuel is a naturally occurring fuel obtained from the remains dead organisms and vegetation.

Out of the given options, only petroleum is formed from the dead remains. Hence, it is a fossil fuel.

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1

Naphthalene ball is obtained from

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Fuel that is used in jet air craft

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Fill in the blanks:

1. The expansion of LPG is ___________.


2. LPG is stored in _____________ form in the gas cylinder.


3. The expansion of CNG is _________________.


4. The chief element in coal is _______________.


5. Natural gas contains mainly ___________________.


6. Heating in the absence of air is called _______________.


7. ______________ is the primary source of energy.


8. The coal obtained in Neyveli is _________.


9. The process of separating individual liquids, from the mixture of liquids which differ in their boiling point is called _____________.


10. ___________ is used as a reducing agent in steel manufacturing.

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Ram’s family cooks food quickly as they use LPG gas. Murugan family takes a longer time to cook food. What could be the reason?