Using 5 rs court fee stamp for affidavit

Stamp act is a state subject.

No dearth of availablity of stamp papers worth Rs. 10/- in Delhi

This is one of the several methods of indicating the payment of stamp duty. Franking machines are installed in some Sub-Registrar office in the State. These machines frank upto a denomination of 999 rupees. An application indicating the amount of duty to be frank is made to the proper officer authorize under the rules along with the unexecuted typed or printed documents. The necessary amount is paid in cash to the proper officer and the required denomination is franked on the document and return to the applicant. 
You can get it done through franking.

One can do the affidavit on Rs. 20/- or Rs. 50/- non judicial stamp paper if Rs. 5/- is not available.

One can do the affidavit on Rs. 20/- or Rs. 50/- non judicial stamp paper if Rs. 5/- is not available.

@Bhanudas, please understand that the court fee is  different from the non-judicial stamp duty to be paid upon an affidavit.  Court fee is for judicial purpose and the non-judicial stamp duty if for all the  purposes other than court fee purpose.  So you cannot affix the rs. 10/- Court fee in lie of nonjudicial stamp in the affidavit.  It is not valid.

Exectly Right ...... both fees are different in nature