Learn more about interrogatories, what to do if you are the responding party, what you can object to, and how much time you have to answer. Interrogatories are a helpful tool for discovery.Interrogatories are written questions which focus on any information relevant to the case. A Practice Note discussing how to draft and serve interrogatories in a civil case in Texas district or county court. Interrogatories are a list of questions from one Party to the other. When a Party May Serve Interrogatories. A party may propound interrogatories at any point up to thirty (30) days before the end of the discovery period. Tex. R. Information about Justice Court Suits and Civil Cases in the Harris County Justice of the Peace Courts. See Harris County Civil Process Service Fees. Some county websites or court websites upload commonly used legal forms as a public service.