2018 NECO PHYSICS OBJ AND ESSAY

ENGR NASER DAHER CARES Call/whatsapp /text 09030302775 For your next paper PHYSICS-OBJECTIVE 1BBBBAAEECD 11CCBCDDAADC 21EEACBAECAB 31EAAECEECBD 41AECCABEECE 51CEABBCABEB ============== *YOU ARE TO ANSWER SIX QUESTION* *FROM.SECTION A* *FOUR QUESTION FROM PART B* *NECO 2018 PHYSICS (THEORY AND OBJ) SOLUTION* 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 spacing ii)plate area ---------------------- ENGR NASER DAHER --------------------- 12a) i) trajectory or flight path is the path that a massive object 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 heat energy need to convert a mass 1kg of a body from ice to liquid without a change in temperature (13bi) Conventional current can be defines as the flow of electrons through the circuit and into the negative terminal of the source (13bii) Practical application: -For correcting change in electron flow -For creating electrons for positive terminals (13c) Mass of water=500g=0.5kg MC(change in tita),ML 0.5*4.2*10^3*100=[(0.5+x)*3.2*10^5] 210000=1.6*10^5+3.2*10^5x 50000=3.2*10^5x x=50000/3.2*10^5 x=0.16kg x=1600g ENGR NASER DAHER 17a)I. Prevent expensive repair works from happening II.Helps you create specialised maintenance programs III.Prevent problems regarding warranty claims IV.It increases the safety of operators V.Helps you track who is accountable for a piece of equipment VI.It increases the resale value of the equipment 17bi)Compound microscope can provide large amounts of magnification, the image produced by visual light are usually of a lower resolution than those produced by other microscopes. 17bII) A film projector is an opto-mechanical device for displaying motion picture film by projecting it onto a screen 17c)A rocket is a vehicle or device designed for travel or operation outside the Earth’s atmosphere, whereas a satellite is an object that orbits the Earth, the moon, or another celestial body I still remain ENGR NASER DAHER