K.C.S.E Physics Q & A - MODEL 1998PP2QN07
a) Fig. 6 shows an object, 0.3cm high placed in front of a concave mirror. C is the centre of curvature of the mirror. The diagram is drawn to scale:(1cm: 2cm)
Draw a ray diagram, on figure 6, and determine the size of the image produced. 
b) Table 3 shows the object distance y and the corresponding image distance v, for an object placed in front of a concave mirror.
i) Complete the table and plot a graph of 1/v (y-axis) against 1/u (give your answers to 3 decimal places).
ii) From the graph, determine the focal length of the mirror.
ANSWERS
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K.C.S.E Physics Q & A - MODEL 1998PP2QN06
Fig 5 shows a circuit for charging and discharging a capacitor; e, through a variable resistor R, X Y and T are points on a two-way switch.
a) Explain how the charging and discharging processes are achieved.
b) Table 2 show the variation of the charge q with time t when a 500u F capacitor was discharged though a resistor. 
Table 2
(i) Plot a graph of charge 0 (y axis ) against time. (ii) Determine the current flowing in the circuit at t =30s. (Give your answer to 1 decimal place)
ANSWERS
K.C.S.E Physics Q & A - MODEL 1998PP2QN05
a) A ray of white light is incident on one face of a rectangular glass prism.
i) Draw a ray diagram to illustrate the dispersion of white light by the prism, showing only the red ® and violet (V) rays. ii) On the same diagram drawn in (i) mark and label the initial angle of incidence, 1, and the angles of reflection on the first face for red rR and for violet rV. iii) Snell's law for the red and colours can be written as nr= Sin I/Sin rR 
b) Calculate the critical angle for a material whose refractive index is 1.40.
ANSWERS
K.C.S.E Physics Q & A - MODEL 1998PP2QN04
a) In an experiment to determine the rate at which solar energy is absorbed by a surface, an aluminum block, coated black and fitted with a heater (Fig. 3) is exposed to the sun, for a period of time. The temperature rise in noted. After the temperature of the block is allowed to fall to the initial temperature, the block is electrically heated to the temperature.
(i) Draw and labeled a circuit diagram that would be used to determine the electrical energy.
(ii) State the measurements that would be taken in (a)(i) to determine the rate of heating of the block. (iii) Explain how the measurements stated in (a) (ii) would be used to determine the rate of heating of the block by the sun. b) Fig 4 shows a photocell 
(i) Label the cathode and anode.
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