Why is tungsten not used as a fuse wire ?

Why is the tungsten used almost exclusively for filament of electric lamps? Explain.

Why is charcoal used as a fuel ?

Why is amniocentesis use ?

Give scientific reasons for the following statements : It is improper to use a copper wire as a fuse wire .

What is the function of an earth wire ? Why is it necessary to earth metallic appliances ?

Why is the use of iodised salt advisable ?

What is rectification and rectifier ? Why p-n junction diode is used as a rectifier?