PHYSICS PAPER 3 Marking Scheme - 2017 KITUI MOCK EXAMINATION

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.  
      
      
      
   4.  
      
   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.  
       

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.  
   
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.  
    
   
   
   
   
   PART B
6.  
   1. Trace of glass block 
      Rays drawn from P₁,P₂ and P₃,P₄ and their intersection labelled I.
      
   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