does balance sheet is used as evidence

It depends upon case to case, nothing can be presumed as to where and what is the case and what is proposed to be proved.

The Supreme Court observed that the consideration of balance sheets as a valid acknowledgment of debts for the purposes of the Act cannot be refuted. ... CIT, wherein it was held that since the registers of a company constitute prima facie evidences,the balance sheet does tantamount to be a valid acknowledgment of debt.

Yes, if it is duly signed and audited by a chartered accountant and original.   You can file RTI and seek such information from ITO, relevant to the single entry you are concerned with.  Information provided under RTI is a piece of valid evidence:  

Information solicited:

1. Please provide whether ........................with PAN No......................disclosed the entry of ................................Rs...............in Balance sheet.

You have not posted the material facts.