K.C.S.E Physics Q & A - MODEL 2008PP1QN15
​ a) State Newton's second law of motion.
b) A matatu starts from rest and accelerates to cover a distance of 49m in 7 seconds. Determine (i) Its acceleration; (ii) Its velocity, after 7 seconds
​c) A trolley moving on a horizontal bench of height 1.2m, strikes a barrier at the edge of the bench. The brass mass on the top of the trolley flies off on impact and lands on the ground 2.5m from the edge of the bench.
Determine: (i) The time taken by the brass mass to reach the ground; (ii) The speed at which the trolley struck the barrier.
1 Comment
K.C.S.E Physics Q & A - MODEL 2008PP1QN14
​The system in Fig. 8 is in equilibrium
​When the temperature of the water is raised the system is observed to tilt to the right, state the reason for this observation.
answer
K.C.S.E Physics Q & A - MODEL 2008PP1QN13
​The graphs in Fig. 7 represent the relations between extension e and mass m added on two springs x and y.
Given that the two springs are made of same materials, give a reason why the graphs are different.
answer
K.C.S.E Physics Q & A - MODEL 2008PP1QN12
​Fig. 6 shows a sheet of paper rolled into a tube.
​When a fast stream of air is blown into the tube as shown in the diagram the paper tube collapses. Explain the observation.
answer
K.C.S.E Physics Q & A - MODEL 2008PP1QN10&11
Fig. 5 shows a toy resting on top of a closed bottle. Use the information on the figure to answer questions 10 and 11.​
Mark on the diagram, point Q, the approximate centre of gravity of the toy.
Giving a reason, name the state of equilibrium of the toy.
K.C.S.E Physics Q & A - MODEL 2008PP1QN09
Explaining the difference between a liquid and a gas in terms of intermolecular distances and forces.
answer
K.C.S.E Physics Q & A - MODEL 2008PP1QN08Fig. 4 shows a conical flask 15cm high, filled with a liquid of density 1200kgm-3. The atmospheric pressure of the surrounding is 8.4 x 104 Pa.
Determine the pressure at the point marked X, at the bottom of the flask.
K.C.S.E Physics Q & A - MODEL 2008PP1QN06&7
Fig. 3 shows a hot water bath with metal rods inserted through one of its sides. Some wax is fixed at the end of each rod. Use this information to answer questions 6 and 7.
​What property of metals could be tested using this set-up?
Besides the length of the rods that is kept constant, what else should be kept constant when comparing the property for the different metal rods?
answers
K.C.S.E Physics Q & A - MODEL 2008PP1QN05
​ Fig: 2 shows a flask filled with water. The flask is fitted with a cork through which a tube is inserted. When the flask is cooled, the water level rises slightly, then falls steadily.
​Explain observation.
answer
K.C.S.E Physics Q & A - MODEL 2008PP1QN04Water is known to boil at 1000C. A student heated some water and noticed that it boiled at 1010C.
​State two possible reasons for this observation.
answer
K.C.S.E Physics Q & A - MODEL 2008PP1QN03
​Fig. 1 shows a brick placed on a plane inclined at an angle to the horizontal. The weight, W, of the brick is shown.
​a) On the same diagram show with arrows the other two forces acting on the brick and name them.
b) State how each of the two forces named (a) above is affected when the angle is reduced. K.C.S.E Physics Q & A - MODEL 2008PP1QN02The masses of equal volumes of a certain liquid and of water were found to be mv and mw respectively. Given that the density of water is 1gcm-3, express the density, p, of the liquid in terms of mv mw (show your work)K.C.S.E Physics Q & A - MODEL 2008PP1QN01
​A drug manufacturer gives the mass of the active ingredient in a tablet as 5 mg.
Express this quantity in kilogramme and in standard form. K.C.S.E Physics Q & A - MODEL 2007PP2QN18
​(a) Figure 14 shows the features of a cathode ray tube
​(i) Name the parts labeled A and B
A …………………………………. B……………………………. (ii) Explain how the electrons are produced in the tube (iii) State two functions of the anodes (iv) At what part of the cathode ray tube would the time be connected? (v) Why is a vacuum created in the tube? (b) The graph in figure 15 was obtained on a cathode ray oscilloscope (CRO) screen when the output of an a.c generator was connected to the input of the CRO. The time- base calibration of the CRO was set at 20 milliseconds per centimeter and the y- gain at 5 volts centimeter.
​(i) Determine the pick voltage of the generator
(ii) Determine the frequency of the voltage On the same grid, redraw the graph for the same voltage when the time base calibration is set at 40 milliseconds per centimeter and y- gain at 10 volts per centimeter. (Show at least one complete cycle) K.C.S.E Physics Q & A - MODEL 2007PP2QN17
​(a) State Lenz's Law of electromagnetic induction
(b) Figure 13 shows a simple microphone in which sound waves from the person talking cause the cardboard diaphragm to vibrate
(i) Explain how a varying current is induced in the coil when the diaphragm vibrates
(ii) State two ways in which the induced current in (i) above can be increased (c) A transformer with 1200 turns in the primary circuit and 120 turns in the secondary circuit has its primary circuit connected to a 400V a.c source. It is found that when a heater is connected to the secondary circuit, it produces heat at the rate of 600w. Assuming 100% efficiency, determine the: (i) Voltage in the secondary circuit (ii) Current in the primary circuit (iii) The current in the secondary circuit K.C.S.E Physics Q & A - MODEL 2007PP2QN16
​(a) Figures 11 (a) and (b) show diagrams of the human eye
​(i) Sketch in figure 11 (a) a ray diagram to show shortsightedness
(ii) Sketch in figure 11 ( b) a ray diagram to show how a lens can be used to correct the shortsightedness (b) Figure 12 shows the features of a simple camer
(i) Name the parts labeled A and B
A ………………………………………. B ………………………………………. (ii) A still object is placed at a certain distance from the camera. Explain the adjustments necessary for a clear image of the object to be formed. (iii) State the functions of the shutter and the parts labeled A and B Shutter …………………………………………………………………. A………………………………………………………………………… B ……………………………………………………………………….. (c) A lens forms a clear image on a screen when the distance between the screen and the object is 80cm. If the image is 3 times the height of the object, determine. (i) The distance of the image from the lens (ii) The focal length of the lens K.C.S.E Physics Q & A - MODEL 2007PP2QN15
​(a) State Ohm's Law
(b) The graph in figure 9 shows the current – voltage characteristics of a certain device, X
(i) State with a reason whether the device obeys Ohm's law
(ii) Determine the resistance of the device, X, when the current through it is 60 mA. (iii) When the device, X is connected in the circuit below, the voltage across it is 0.70 V.
​Calculate the value of the resistance R.
(c) The cell in figure 10 has an e.m.f of 2.1 V and negligible internal resistance.
​Determine the
(i) Total resistance in the circuit (ii) Current in the circuit (iii) Reading of the voltmeter K.C.S.E Physics Q & A - MODEL 2007PP2QN14
​ You are provided with a diode, a resistor R, an a.c source of low voltage and connecting wires.
In the space provided, sketch the circuit diagram for a half – wave rectifier and indicate the terminals where the output voltage V0 may be connected. K.C.S.E Physics Q & A - MODEL 2007PP2QN13
​The following is part of radioactive decay series
​Determine the values of a and b
a = ……………………………………. b= ………………………………
answer
K.C.S.E Physics Q & A - MODEL 2007PP2QN11&12
​ The graph in figure 8 shows the variation of photoelectric current with applied voltage when a surface was illuminated with light of a certain frequency. Use the information in the figure to answer questions 11 and 12
​On the same axes, sketch the graph when light of higher intensity but same frequency is used to illuminate the surface.
Explain your answer in 11 above
K.C.S.E Physics Q & A - MODEL 2007PP2QN10
State what is meant by the term accommodation as applied to the human eye.
ANSWER
K.C.S.E Physics Q & A - MODEL 2007PP2QN09
​A heater of resistance R1 is rated P watts, V volts while another of resistance R2 is rated 2P watts, V/2 volts. Determine R1 / R2
K.C.S.E Physics Q & A - MODEL 2007PP2QN08
​In the circuit diagram shown in figure 7, the ammeter has negligible resistance
When the switch S, is closed, the ammeter reads 0.13 A.
​Determine the internal resistance of the cell
K.C.S.E Physics Q & A - MODEL 2007PP2QN07
​ Figure 6 shows a ray of light incident on the face of a water prism
​Sketch the path of the ray as it passes though the prism
Critical angle for water is 49 K.C.S.E Physics Q & A - MODEL 2007PP2QN06
​ Figure 5 (a) and (b), show wavefronts incident on barriers blocking part of the path.
​On the same figures sketch the wavefronts to show the behavior of the waves as they pass each barrier and after passing the barrier.
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