Waec 2018 Physics OBJ & Theory/Essay QUESTION AND ANSWERS
physics question and answers complete answers free physics question and answers physics question and answers physics question and answers Welcome To Recruitmentgist Exam Help Desk. As Usual we will post the answers here for free, So just invite all your Class Mates and Friends. The next subject on board now is Physics Objectives And Theory.
AS WE ALL KNOW THE WEST AFRICA EXAMINATION COUNCIL IS ABOUT TO COMMENCE AND A LOT OF STUDENTS ARE RUINING ABOUT LOOKING FOR WHERE TO THE BEST THE RESULT, ARE YOU ALSO SEATING FOR THIS EXAMS IF YES THEN YOU ARE ON THE RIGHT SIDE,READ CAREFULLY AS WE GIVE YOU THE QUESTIONS AND ANSWER NOW.
SECTION A ANS 5QUESTION ================================1)
decrease in height (h) increase in time (t) this shows that distance changes with time ================================== 3) i)Brownian motion ii)Atomic size iii)Expansion ================================ 2) given that U=15m3^-1 R=U* sqr2h/g h=20m g=10 R=15*sqr2*20/10 R=15*sqr40/10 R=15*sqr4 R=15*2=30m R=30m ============================= 4) L1=14cm F1=4N,F2=6N L2=4cm, Lo=? Using hooke’s law 4/14-Lo*6/4-Lo 4(4-Lo)=6(14-Lo) 16-4Lo=64-6Lo -4Lo+6Lo=64-16 2Lo=48 Lo=48/2 Lo=24Cm ============================= 5a) i)force ii)length 5b) by increasing the density mosquitoes lavrva than the density of water ================================= 6) A)Energy efficient- so far the best light for interior lighting B)Low production cost (of tubes, not of the ballasts) C)Long life of tubes ================================ 7) i)It requires low voltage sources for it to function ii)It cannot be easily broken iii)It is cheaper and quite easy to manufacture ==================================
8b) If their distance and masses are doubled their corresponding force would also be doubled and the work done respectively I.e.Workdone=Force * distance Force= Mass * Acceleration W= Mg * d | Increase 8c) -Acceleration due to gravity – At maximum height, final velocity is zero 8d) i)pushing someone on a swing. ii)Tuning a radio to a particular frequency. =10a)
A wave front is an imaginary surface passing through the points of a medium oscillatory in phase ============ 10b) i)Priam periscope used in harmod car ii)prismatic bihocular to see round corner 10bii) i)refractive indege of the glass prism ii)the angle of incident of the roy ==========
SECTION B ANS 3 QUESION ================================ 12ai) Nuclear fission is a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy. 12aii) A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows un-enriched uranium to be used as nuclear fuel. 12aiii) Boron rods are used in nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning. ==============Typing……..