This Post has 20 Multiple Choice Type or objective questions from the chapter on Complex Numbers. Do these in as many minutes, or better a few less. On submission, the colour of the options changes so as to reflect the correctness or otherwise of your attempt. And, the timer having been set just to remind, is not too restrictive. No negative marks either. Good luck!
Alarm set at 20 minutes.
Clark University – Dave’s short course on Complex Numbers