NECO SSCE 2018/19 Physics Obj & Theory Questions & Answers/Expo/Runz - Scholarships, Nigeria Universities, Polytechnics And Admissions News

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## 1a) Electricity is produced from a dam by first restricting the flow of water from one end of the dam to the other, concentrating the water and making it so that the water flowing through the dam has a higher velocity. The water flows through a turbine, or series of turbines. The lateral velocity of the water turns the turbines. The water escapes out the other end of the dam.The turbine is connected to a shaft and a generator, essentially a large magnet with a coil of wires around it. Moving the magnet or the coils around generates the electricity. The basic premise is to get the magnet or coils inside the generator to move, and in a hydroelectric power plant, the energy in the natural movement of water in streams and rivers is harnessed to do so. ============================== 6a). The incident ray, reflected ray and normal at the point of incidence all lie on the same plane 6b i) myopia can be corrected by placing a suitable concave or diverging lens in front of the eye ii) the action of the lens is to diverge the light rays entering the eye from a distant object and make them appear coming from the persons far Point ============================== 9a) (i)Plate spacingii)plate area ============================== 12a) i) trajectory or flight path is the path that a massiveobject in motion follows through space as a function of time. ii) -a baseball that has been pitched, batted, or thrown-a bullet the instant it exits the barrel of a gun or rifle– a moving airplane in the air with its engines and wings disabled. ============================== (13a)Specific latent heat of fusion is the quantity of heatenergy need to convert a mass 1kg of a body fromice to liquid without a change in temperature (13bi) Conventional current can be defines as the flow ofelectrons through the circuit and into the negativeterminal of the source (13bii)Practical application:-For correcting change in electron flow-For creating electrons for positive terminals (13c)Mass of water=500g=0.5kgMC(change in tita),ML0.5*4.2*10^3*100=[(0.5+x)*3.2*10^5]210000=1.6*10^5+3.2*10^5x50000=3.2*10^5xx=50000/3.2*10^5x=0.16kgx=1600g ============================== 17a)i)Stay on top of large machinery operator trainingii)Keep large machinery clean, and maintain a clean environment17bi)-Compound Microsoft-for viewing samples at high magnification (40 – 1000x), which is achieved by the combined effect of two sets of lenses: the ocular lens (in the eyepiece) and the objective lenses17bii)-Film projector-an optical device that projects an image (or moving images) onto a surface, commonly a projection screen.17c)Artificial satellite orbits the earth and observes it. A rocket is designed to go to different planets, either taking people with it, or taking a space prob to take pictures of that planet.17d)data givenRg=5n,Ig=10mA Vg=40V Rx=?Ig=10mA =10*10^-3AIg=10^-2AFor Conversion Of galvanometer into voltmeter.Vg=Ig(Rg+Rx)Vg=Ig Rg + Ig RxVg-Ig Rg =Ig RxRx=Vg-IgRg/IgRx=Vg/Ig-Rg=40/10^-2 – 5/1Rx=40/0.01 – 5/1Rx=40-0.05/0.01Rx=39.95/0.01Rx=3995the resistance of resistor is 3995 ======================================= 15ai)Force field is a region around a body in which it experiences an effect (force) due to the presence of another body15aii)i)gravitational fieldii)magnetic field15b)Show that the escape velocity(Ve) of an object from the earth surface is √2Gme/rTo prove the escape velocity (Ve) of an object from the earth surface we can say let the kinetic energy of the object of mass M isEk=1/2MVe^2When an object is at any given point P which is at a distance X from the centre of the earth the force of unity between the object and earth isF=Gmm/X^2Work done is taken the body against gravitational attraction DW=Fdx=Gmm/X^2 DXWhere W=work done in taking the body against gravitational attractionW={R DW= {R Gmm/X^2 DM=Gmm {R X^2 DM = Gmm [X^2/Y {R= -Gmm [1/X] R = – Gmm [1/~ – 1/R]Or, W=Gmm/RFor the object to escape from the earth surfaceEk=workdone,WEk=W1/2MVe=Gmm/RVe=√2Gm/R(proved)15ci)i)Power supply smoothing applicationsii)RF coupling or filter capacitor applications15cii)Data givend =4mm=4*10^-3 , 0.004mA= 0.2m^2, V=300V[Eo=8.85*10^-12fm^-1]i)capacitance of the capacitorusing the approprate formulaC=EoAv/dC=8.85*10^-12*0.2*200/0.004C=8.85*10^-12*2*10^-1*2*10^2/4*10^3C= 35.4*10^-11/4*10^-3C= 8.85*10^-10^-11+3C=8.85*10^-8Fthe capacitance of the capacitor is 8.85*10^-8Fii)Electric Field intensity between the platesE=F/q =K.q.d/d^2/qE=kQ/d^2E=8.85*10^-12*Q/d^2but Q=CVQ=8.85*10^-8*2*10^2Q=17.7*10^-6 C,1.77*10^-7CE=8.85*10^-12*1.77*10^-7/(4*10^-3)^2E=15.7*10^-19/16*10^-6E=1.57*10^-20/1.6*10^-5E=0.98*10^-15E=9.8*10^-1*10^-15E=9.8*10^-16N|C or E=9.8*10^-16NCthe electric field intensity have the plates is 9.8*10^-16 NC======================================= Neco Physics (Objective and Essay) Runz, 2018/2019 Physics (Objective and Essay) Questions and Answers Runz – June/July Expo, 2018 Neco Physics (Objective and Essay) Questions, 2018 Neco Physics (Objective and Essay) Answers, 2018/2019 NECO SSCE Physics (Objective and Essay) Questions And Answers Exam, Expo, Runz..

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