hello aspirant......

yes,you can apply for both the papers jee mains paper 1 as well as paper 2

but it is not necessary to attempt both the papers the candidates those who want to go i the stream of engineering those can apply for jee mains paper 1

and those who want to go in the stream of architecture those should apply for the jee mains paper 2

and those candidates who are interested in both those can apply both the papers jee mains paper 1 and as well as jee mains paper 2

i hope this informaion is helpful

all the best.

No it is not necessary at all.Paper 1 is for B-Tech and paper 2 is for B-Arch. So, if you will apper only in paper 1 then no problem but you are only elligible only for B-Tech not for B-Arch that's simple.