A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. At the request of the Committee on Rules and Practice of the Judicial Conference of the.Includes rule amendments up to Sept. In cases not subject to Uniform Interrogatory requirements, interrogatories must be answered sixty (60) days after being served. Forms are divided into categories. B. Interrogatories. 1. A defendant may serve interrogatories upon the plaintiff without leave of the court within one year after commencement of the action. Mass.R.Civ. (e) Motions to Strike. In federal civil litigation, interrogatories are written questions that must be answered in writing under oath. Any party may serve interrogatories upon any other party without leave of court within one year of service of the summons and complaint upon that party. Mass.R.