Rule 4005 requires the inquiring party to leave sufficient space after each interrogatory for insertion of the answer. Answers to interrogatories shall be in writing and verified.The answers shall be inserted in the spaces provided in the interrogatories. A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. Each interrogatory of whatever nature shall be numbered consecutively. The following resources include sample forms related to Pennsylvania interrogatories. Resources to assist counsel with obtaining and using written discovery from parties and nonparties in a civil action pending in a Pennsylvania court of common Use the form with the boxes to guide you through filling out the blank form. Service. Interrogatories must be served on the party from whom responses are sought and all other parties who have appeared in the action. Basically, you switch out the parties name and serve the discovery to each defendant.