Perjury is -
It means wilful giving of false evidence by a witness while under oath, or failure to tell what he knows or believes to be true occurs if the persons earlier statement regarding the facts on oath & subsequent statement also must be on oath & both statements are opposed to each other & they cannot be reconciled. It falls under S.191.I.P.C. REF:The synopsis of forensic med (Dr.K.S.Narayan Reddy) pg no -8 (29th edition).
Willful utterance of falsehood
An act committed within cou premises
Failure to sign summons
Failure to appear as a witness
Medico legal procedures