Which gas is evoleved when coal heated in air?
Carbon monoxide
Carbon dioxide
Nitrogen dioxide
Oxygen
Coal is formed by the process of?
Carbonisation
Distillation
Vaporisation
Evaporation
Renewable sources of energy are produced in nature?
Biennial
Annually
Continuously
Quarterly
What is the main constituents of petroleum gas?
Butane
Propane
Methane
Ethane
Fly ash is produced from?
Petroleum
Natural gas
Coal
All the above
Which one of the following is NOT a fossil fuel?
Petrol
Coke
Charcoal
Which of the following is used as a fuel?
Gasoline
Ether
Pitch tar
Grease
In the oil wells,natural gas forms the top most layer, followed by oil and finally water.This is because,
Oil and gas are heavier than water
Oil and gas are lighter than water
Oil and gas stick to each other
None of these
When sand is poured over some burning material, the fire goes off. Thi is because?
The ignition temperature is brought down by sand
Supply of air is cut off
Sand is a bad conductor of heat
All of the above
The process of heating coal in the absence of air is called
Fractional distillation
Destructive distillation