Answer: IPC 193.
Step 1: Perjury is giving or fabricating false evidence under oath. The punishment for this is laid down in Section 193 IPC.
Step 2: Under IPC 193, a witness who gives false evidence in a judicial proceeding can be imprisoned for up to seven years and is also liable to a fine.
Step 3: Distinguish the related sections: IPC 191 defines giving false evidence, and IPC 192 defines fabricating false evidence, but neither prescribes the punishment. IPC 197 deals with issuing a false certificate.
Ref: The Essentials of Forensic Medicine and Toxicology, K.S. Narayan Reddy, 33rd edition, pg 13.