A visual walkthrough of how to answer Physics questions from question number 1-13 of GCE Combined Science 5129 O'Level paper 1 May/June 2012. You may pause the video to read the questions before proceeding with the walkthrough. Feel free to skip to the question number that you have problem with according to the timestamp stated below: 00:00 Intro 00:08 Qn 1 Physical quantities and units 00:56 Qn 2 Kinematics 01:53 Qn 3 Dynamics 02:21 Qn 4 Density 02:44 Qn 5 Power 03:31 Qn 6 Temperature 04:09 Qn 7 General wave properties 04:22 Qn 8 Light 05:05 Qn 9 Current electricity 05:25 Qn 10 Direct current (d.c.) circuits 06:19 Qn 11 Electromagnetic induction 06:47 Qn 12 Nuclear atom 07:05 Qn 13 Radioactivity