PHYSICS PAPER 3 Marking Scheme - 2017 KITUI MOCK EXAMINATION

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  1. Question
    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
  2. 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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