Section 14(4) in Bihar Buildings (Lease, Rent & Eviction) Control Act, 1982
(4)The tenant on whom summons is duly served (whether by ordinary mail or by registered post) shall not contest the prayer for eviction from the premises unless he files an affidavit stating the ground on which he seeks to make such contest and obtains leave from the Court as hereinafter provided; and in default of the appearance in pursuance of the summons or his obtaining such leave the statement made by the landlord in the suit for eviction shall be deemed to be admitted by the tenant and the landlord shall be entitled to an order for eviction on the ground aforesaid.