Verified Waec 2017 physics obj and theory answers available

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  Just as I promised to post free answers 15min before exam here they are
  
  PHYSICS OBJ
  1BBCADAAABB
  11BBDCBDC-CD
  21ABCDCCCDAC
  31ACCBCDA-BC
  41A-DDAADBDC
  
  Accurate
  1)decrease in height (h)
  increase in time (t)
  this shows that distance changes with time
  
  
  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
  
  3i) Brownian Motion
  II) Atomic Size
  Iii) Expansion
  
  4) Let the unstrength legth be Lo
  Using F=Ke
  I.e. F/e=K
  F1/e1=F2/e2=k
  4/14-Lo=6/4
  6(14-Lo)=16
  84-6Lo=16
  84-16=6Lo
  6Lo=68
  Lo=68/16
  Lo=11.33cm
  
  
  5a)
  i)force
  ii)length
  
  5b)
  By increasing the density mosquitoes lavrva than the density of water
  
  6i)Energy efficient- so far the best light for interior lighting.
  ii)Low production cost (of tubes, not of the ballasts)
  iii)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
  
  8a)  It is a straight line graph
  II) The gradient is the velocity
  
  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
  
  10bi)Prismatic binoculars is used to see round corners
  II) Prism Periscope is used to bend and reflect light
  
  10bii)i) Refractive index of the glass prism
  II) The angle of the incident of ray
  
  11a A dielectric is an electrical insulator that can be polorised by an applied electric field.
  
  11aii) GIVEN: A = 9.6 * 10^-3 M^2
  d = 2.25 * 10^4
  Eo = 8.85 * 10^-12 F/m
  Er = 900
  C = /
  using; C = EoErA/d
  
  capacity, C = 8.85*10^-12 * 900 * 9.6*10^-3/2.25 * 106-4
  C = 33984 * 10^-11
  C = 3.3984 8 10^7 F
  C =0.344F
  
  11bi) A voltmeter has a higher resistance because it is designed to limit the flow of current to practically zero to avoid voltage drop or less across it.
  
  11bii) combined resistance Rt
  Rt = (400 * 400/400 400) (800 * 800/800 800)
  Rt = 200 400
  Rt = 600ohms
  current supplied by battery = r/Rt
  = 6/600
  = 0.01A
  voltage drop across the resistance = 200 * 0.01
  =2V
  therefore the voltage reading is 6 -2
  = 4V
  
  11c) Equivalent resistance is:
  Rt = 2 2 (2*2/2 2)
  Rt = 4 1
  Rt = 5ohms
  
  =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
  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)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.
  
  12aii)b)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.
  
  

  

  
  

  

  
  

  

  
  

  

  
  

  

  
  

  
  

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• doktoh bash: Thursday, 6 April 2017 at April 06, 2017 (edit)
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