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Can tungsten be used in a combustion chamber for turbofans?
It might sound like a good idea, but think about the incandescent light bulbs people replace on a continuous basis. If you apply this to an ignition system, you will be replacing some parts...
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Who used Runic symbols and what were they used for?
The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.
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Why is a model airplane used and where it is used?
A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)
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Where are robots used and what are they used for?
That people wont work.
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What did hydrogen used to be used for?
The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed...