subject question = question asking about the subject. Who shot him? Who moved my cheese? Who asked this question? object question = question about the object. Who did you shoot? What did you move? What did you ask? Quite simple, really.

Subjective questions are those which require detailed answers written down as complete paragraphs. eg: Describe the role played by Khomeini in Islamic revolution. Objective questions typically only require you to choose among a set of "options". eg. Which among the following is the capital of Iran? a. Tehran b. Baghdad c. Delhi d. Kabul

I'm not sure what you mean by subject question and object question. Do you mean subjective and objective? If so... Subjective means that the correct answer is a matter of opinion. For example, "What is the best TV show?" The answer will change from person to person. There is no absolute correct answer, so it is subjective. Objective means that there is one correct answer based on facts. For example, "What year was George Washington born?" This is a question about a fact, so it is an objective question.