After papers are delivered to the other side, proof of this must be given to the court. Interrogatories are a discovery tool (among many) used in lawsuits in New York courts.In sum, these are written questions seeking specific information. The New York rules do not specify requirements for formatting Interrogatories, but the general formatting rules for papers apply. Additional Format Requirements. New York City Corporation Counsel's Office. Service of interrogatories. 3133. (a) Interrogatories are limited to 25 in number, including subparts, unless another limit is specified in the preliminary conference order.