Which alkyne is used in Hawker's lamp?

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. Which metal is used to make filament of an incandescent lamp ? What are the advantages of using this metal as a filament ?

Which liquid fuel is used in stoves, lamps and jet air-crafts?

Which of the folllowing noble gases is used in miner 's cap lamps ?

Which of the following noble gases is used in miner's cap lamp ?

Which one of the following noble gases is used in miner's cap lamps?

Which of the following noble gases is used in miner's cap lamp ?

Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?

The gas used in beacon lamps is