Discretionary powers of j.m.f.c

For your 1: Relief under S. 12,18,19,20,21 DV Act are under discretionary powers of a JFMC

For your 2: S. 473 CrPC a Magistrate delay in taking cognizance - Condonation - Power of Court is discretionary in reference to context of S. 498a IPC.

Otherwise Universal Publications Bare Act / Code on DV Act - CrPC - CPC are good resource index and are cute little Yellow Books which are pocket friendly too for answering series of larger questions in future on similar subjects; suggested to buy them today first thing in the morning from any local Law Book store near to you or Flipcart them OR if you complain of morning sickness then at leisure search yourself complete text at https://india.gov.in/govt/acts.php