K.C.S.E Physics Q & A - MODEL 2002PP2QN02
​Fig. 3. Shows the path of radiation form a radioactive source after entering a magnetic field. The magnetic field is directed into the paper and is perpendicular to the plane of the paper as shown in the figure
​Identify the radiation
b) Below is a nuclear reactio
​i) Identify radiation K
ii) Determine the values of X and Y. (c) Fig 3 shows a device for producing metal foils of constant thickness. Any change in thickness can be detected by the Geiger tube and recorded by the Geiger. The pressure adjusted by the roller is then adjusted to keep the thickness constant.
​(i) State the change in the metal foil that will lead to a decrease in the Geiger counter reading
(ii) Give a reason for your answer in c(i) above (iii) State the change in the roller pressure that should be made as a result of this decrease in the Geiger counter reading. (iv) Give a reason for your in (c) (iii) above (v) Explain why a source emitting (alpha) particles only would not be suitable for this device. (vi) Explain why a radioactive source of a half-life of 1600 years is more suitable for use in the device than one of a half-life of 8 minutes.
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K.C.S.E Physics Q & A - MODEL 2002PP2QN01
Figure 1 shows the path of array of yellow light through a glass prism. The speed of yellow light in the prisms is 1.88 x 108m/s.
a) Determine the refractive index of the prism material for the light (speed of light in vacuum e = 3.0 x 108 ms-1)
b) Show on the figure the critical angle, c, and determine its value.
c) Given that r = 2 1 .2°, determine the angle O d) On the same figure, sketch the path of the light after striking the prism if the prism was replaced by another of similar shape but lower refractive index. (Use dotted line for your answer) K.C.S.E Physics Q & A - MODEL 2001PP2QN07
​ai) State the pressure law of an ideal gas.
ii) The pressure p, of a fixed mass of a gas at constant temperature T= 300K is varied continuously. The corresponding values of P and the volume V of the gas are shown in table 2.
​Given that PV = 2RT where R is a constant, plot an appropriate graph and use it to determine r.
b) A tin closed with an airtight lid contains air at a pressure of 1.0 x 105+ Pa and temperature of 12 C. The tin is heated in a water bath until the lid opens. If the temperature at which the lid opens is 88C, determine the pressure attained by the gas. (Ignore expansion of the tin).K.C.S.E Physics Q & A - MODEL 2001PP2QN06
​a i) State one of the Newton's law of motion
ii) A body resting on a horizontal surface is given an initial velocity V so that it slides on the surface for some distance before coming to a stop. Table I shows the distances d moved by the body of various values of u
Given that v2 is 20 (miu)d where u is a constant for the surface, plot a appropriate graph and use it to determine u.
Determine values of u on table. b) A train of mass 200 tonnes starts from rest and accelerates uniformly at 0.5ms-2 determine its momentum after moving 100m. K.C.S.E Physics Q & A - MODEL 2001PP2QN05
​a) You are provided with 12V a.c source, four diodes and resistor.
i) Draw a circuit diagram for a full wave rectifier and show the points at which the output is taken. AC source shown-symbols; arrangement of diode (one for each pair); correct position of R; correct position of output. ii) Sketch the graph of the output when a capacitor is put in parallel with the resistor in the circuit in (i) above.
​b) A certain transistor is connected in common-emitter-mode. The base current IB is 0.50 ma. Determine the values of the:
(i) Emitter current IE. (ii) Base-collector current gain beta (iii) Current gain alpha K.C.S.E Physics Q & A - MODEL 2001PP2QN04
Fig 3 shows the main features of a cathode ray tube (CRT) of a cathode ray oscilloscope (CRO)​
i) Describe how the electrons are produced in the tube.
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