It depends on what you are reading and why you are answering questions. Are you reading fiction or nonfiction? Are the questions on a test? If so, is the test a timed test? It also depends on the type of question you have to answer (multiple choice, short answer, essay).
Can you tell us more about the circumstances you have with your reading and questions?
It is not a timed test. The questions are on a paper. 6-7 questions are given after the passage(MCQ's or short answer question). The passage is from 500-700 words. It can be fictional or non-fictional.
The answer to your original question depends on what works for you. I'll tell you what worked for me; that doesn't mean it will work for you.
When I had this sort of task, I would read the passage through quite quickly, trying to get a general idea of what it was about. It did not matter if I did not understand some parts or, if it was arguing a case, if I misunderstood which sdie