Interrogatories are one form of discovery in a lawsuit. An interrogatory is a written question from one party to the lawsuit to another party to the lawsuit.You cannot send more than 30 questions to another party in a circuit court case. The Maryland Rules have form interrogatories that you can use as an example. The most important thing to remember when answering discovery is to tell the truth. If you do not, you risk sanctions from the court. Interrogatories are written questions that require written answers under oath. All parties are limited to 30 interrogatories (written questions) sent to any other one party in the case. Form No. 3 - General Interrogatories. 1. Interrogatories in Aid of Execution are up to fifteen (15) written questions to the debtor about their assets and income.