The judge and lawyers ask these questions during a process called voir dire.

The judge and lawyers are concerned about making sure each juror is unbiased. How you answer question A regarding topic B could be very revealing of your bias towards the case even if neither question A nor topic B have anything to do with the case. People often lie on question X on topic Y (questions and topics more directly related to the case), or their answers often don't reflect how they actually act in the jury room.