1) If affidavit from the 1st class judicial magistrate is enough to take care of all the anomalies , Can you please share the format of affidavit ?
The publication of name change in any two leading newspaper is mandatory without which even the affidavit will not solve the purpose. The affidavit to be sworn before JMFC will not be sufficient.
The format you can get it locally.
2) Will be this a joint affidavit with my husband or single affidavit ?
No it should be an individual affidavit
3) Should I fix joint photograph with my husband (like marriage certificate) on the affidavit ?
No it is not necessary.
4) I presently stay in Kolkata .But my voter ID card ,Aadhaar card has Hooghly District address.
Address proof can be given whichever you possess.
Can the affidavit be sworn before 1st class magistrate in any court or High Court ?
The magistrate of First class is the judicial magistrate in the lower court and not in the high court.
5) Last question , will an affidavit before a notary public also work ? I remember when I joined work as lecturer the principal asked me to submit an affidavit along with marriage certificate to appoint me in my new name and that time I made an affidavit following the format of passport sample affidavit before a notary public.
The affidavit can be attested by a notary public too.