Which of the following cuts ultraviolet rays?

Write the uses of $n$-type and $p$-type semiconductors.

What type of solids are electrical conductors,malleable and ductile?

Which of the following is a network crystalline solid?

$A$ solid which is very hard,has a very high melting point in the solid state,is an insulator,and becomes a conductor of electricity in its molten state is a/an ..... solid.

Wax is an example of which type of crystal?