(1) All oaths and affirmations made under section 4 shall be administered according to such one of the forms given in the Schedule as may be appropriate to the circumstances of the case:
Provided that if a witness in any judicial proceeding desires to give evidence on oath or solemn affirmation in any form common amongst, or held binding by, persons of the class to which he belongs, and not repugnant to justice or decency, and not purporting to affect any third person, the court may, if it thinks fit, notwithstanding anything hereinbefore contained, allow him to give evidence on such oath or affirmation.
(2) All such oaths and affirmations shall, in the case of all courts other than the Supreme Court and the High Courts, be administered by the presiding officer of the court himself, or, in the case of a Bench of Judges or Magistrates, by any one of the Judges or Magistrates, as the case may be.