A party may direct written interrogatories to any other party. A copy of the interrogatories shall be served on all other parties entitled to notice.Plaintiff requests that each defendant separately answer the following interrogatories under oath pursuant to Rule 33 of the Federal Rules of Civil Procedure:. A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. Service of discovery shall be made in the manner provided for service of documents in Rule 11. (n) Claims of Privilege. Interrogatories and requests for admission are additional tools that parties can use to discover information before trial. Local rules may not require the filing of discovery. Instead, a party serving discovery shall file a certificate of service of discovery document. Absent a stipulation or order of court, a responding party must serve answers and objections to interrogatories within 30 days after service. Fed.