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Waec past questions and answers on physics merged

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WAEC Past Questions and Answers on Physics Compiled by ​EduNgr.com From 2016 & 2015 WAEC Past Questions Question 11 Two capacitors C1 and C2 are connected as shown in the diagram. The capacitance C2 is twice C1 when the key is opened the energy stored up in C1 is W. If the key is later closed and the system is allowed to attain electrical equilibrium, the total energy stored in the system will be Options A) 12 W B) 23 W C) W D) 2W E) 3W The correct answer is E. Explanation: E = 12 Cr2 = 12 (C − 1 + C2 )V 2 = (3C1 )V 2 = 3( 12 C1 v2 ) = 3W Question 12 In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend to concentrate most? Options A) A B) B C) C D) D E) E The correct answer is E. Explanation: As a result of point action, charges are concentrated on the area in the diagram that is the most narrow. E is the point that is the most narrow. Explanation provided by Cincinsoko Egun Question 13 Which of the following is stored by dry Leclanche cell? Options A) chemical energy B) nuclear energy C) solar energy D) heat energy E) electrical energy The correct answer is E. Explanation: The Leclanché cell is an electric battery invented and patented by the French scientist Georges Leclanché in 1866. The battery contained a conducting solution (electrolyte) of ammonium chloride, a cathode (positive terminal) of carbon, a depolarizer of manganese dioxide (oxidizer), and an anode (negative terminal) of zinc (reductant). The ...
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