Which of the following fibres are made of polyamides?

The polymer used in bulletproof glass is:

Which of the following is an example of a fibre?

Neoprene,a synthetic rubber,contains which of the following elements besides $C$ and $H$?

$A$ polymer with high chemical stability has a melting point $(M.P.)$ of $327\ ^\circ C$ and the density of a completely crystalline sample is $2.3\ g/cm^3$. It is:

$A$ polymer containing nitrogen is