There is very much a formula to writing multichoice (objective) questions and how its done depends on the number of choices you are given (I have had up to 8 per question in one uni unit arrrggghhh). Nowdays 4 is the most common with 5 on the odd occassion. How do we write them? If there are 4 choices (A, B, C, D) then two will generally be absolute BS and it is best to find these and cross them off quickly but you need to go through each possible answer and either tick (where it may be correct) and cross those that are obviously wrong. Now you have narrowed it down to 2 choices look very carefully, use your conceptual knowledge to see if you can find the trick (there is usually one be it in the wording or numbers) that will standout as being the best choice. And that really is the trick as both physics and chemistry allow the last two choices to both be correct but one will be just that little bit more so (my students often struggle with this). Your teacher has given you good advice. The advantages of doing the objective questions last are twofold.
1. You are well warmed up and will have covered the theory elsewhere in the exam making it easier to spot the right answers (saves time).
2. If time is short you can at least have a punt on the answer with a 25% chance of lucking out (always choose C
).
Remember you have at least 1 minute to answer each question so take your time to make sure you get it right but you really do need to know your stuff to get 100% in this section. Hope that helps.
Mark