1) since your father native place is bihar and ancestral properties are located in bihar and you have domicile certificate of bihar you can use the OBC-NL of Bihar

2it should not create any conflict

you should mention your permanent address of bihar only

2) temporary address of Bangalore can be mentioned

what basis you made statement that you have domicile of bihar ?

2) if you had domicile of Bihar then you can obtain OBC-NL certificate from Bihar

3) your permanent residence is of Bihar as properties are situated in bihar your father was working in jharkhand temporarily

During my interviews thry verified the certificate and din't question the validity. But during the admission they might verify a bit more. So I just wanted to ask whether what I am doing is legal or not ?. Is there any chance this will create any conflict ?

Please be aware tht as per as community certificate verification is concerned, the authorities will not go beyond a certain extent, and even if they would like to clarify the same, they would send a letter to the issuing authority to confirm that this certificate was issued by the concerned authority or not.

If the authority has issued the certificate ,they will confirm it and ther is no need any panic in this, moreover since you belong to the said community in both the states, there is no illegal information about this.

I work in bangalore and in some forms earlieri might have given my permanent address of Jharkhand , but now onwards post my admission offer all addresses in all the subsequent forms i give address of Bangalore.

The employment in private sector do not need your community certificate.

The addresses for correspondences is main and it should not be a fake or bogus address.

Dont imagine things and keep worrying about nothing.

But won't I be questioned that none of your family members live in Bihar then how come the certificate states that "Your ordinarily reside in Bihar"

Nobody has time or interest that where you belong to and why this address is given etc.

They will be concerned with your own credential and reliable and trustworthy information about you and they may not be interested in knowing about which place you belong to or taken birth etc.

Also, what should i quote for the question "State/UT you belong to" in the form - Bihar or Jharkhand ?

Please note that I am born and brought up in Jharkhand and have completed my schooling from there

You hav to furnish the correct information about you and should not be worried about irrelevant facts.