PHYSICS PAPER 3 Marking Scheme - 2017 KITUI MOCK EXAMINATION

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Question 1

  1.  
    1. h = 3.0cm 1.0 (1 D.p a must)
    2.  
       x(cm)   h(cm)  x2(cm2)  x2/h(cm) 
       20  3.6  400  111.11
       25  5.9  625  105.93
       30  8.8  900  102.27
       35  12.5  1225  98
       40  16.5  1600  96.97
       45  22.5  2025  90
        -each 1/2 mark
      -1 d.p range +1
      -max 3 mks
       

       -4sf or exact
       -each 1/2 mark
       -max 3 mks

    3.  
      p3_ans_1iii.jpg

    4.  
      p3 ans 1iv.PNG
    5. When h = 0   x2/h= 110 cm  (Unit a must)
  2.  
    1. t = 28.16 seconds +1s (1 d.p a must)
    2. T = 1.408 seconds (exact or 2d.p)
    3.  
       p3 ans biii.PNG

Question 2

PART A

  1. iv)
     Length(cm)   5   15  25  35  45
     V (volts)  1.2  1.0  0.8  0.6  0.4
    1 d.p must
    4 correct values ½ mk
  2. iii)
     Length (cm)   95  90  85  80  75
     V(volts)   0.7  0.6  0.5  0.4  0.3




  3.  
    p3_ans_2c.jpg
  4.  
    1. V = 1.3 + 1V           (1 d.p, if no units ½ mk)
    2. L = 63.0cm + 1cm   (1 d.p, if no units ½ mk)
  5.  
     p3 ans 2e.PNG




    PART B
  6.  
    1. Trace of glass block 
      Rays drawn from P1,P2 and P3,P4 and their intersection labelled I.
      p3 part b hi.PNG
    2. QP = 10.6 + 1cm (1 d.p must, if no units ½ mk)
      QI = 6.8  + 0.1 cm (1 d.p must, if no units ½ mk)
    3. QP/QI=10.6/6.8                   Substitution (½ mk)
      = 1.5588             Evaluation exact or 4 s.f (½ mk)
      If no substitution award 1 mk
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