## PHYSICS PAPER 3 Marking Scheme - 2017 KITUI MOCK EXAMINATION

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.

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.

2. Question 2

PART A
1. iv)
 Length(cm) 5 15 25 35 45 V (volts) 1.2 1 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

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