Q1 of 22 Page 143

Fuel that is used in jet air craft

Kerosene is the fuel used in aircraft.

Petrol or petroleum is not used because it is costly & volatile fuel.


Diesel is not used because of its high freezing point, At higher altitudes, it is very difficult to keep the diesel in liquid form.


Hence, kerosene alongwith gasoline is used as jet aircraft fuel.

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Which type of coal is used in household?

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which of these is a fossil fuel?

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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.