K.C.S.E Physics Q & A - MODEL 2011PP2QN11
​A 4 ohms resistor is connected in series to a battery of e.m.f 6V and negligible internal resistance. Determine the power dissipated by the resistor.
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K.C.S.E Physics Q & A - MODEL 2011PP2QN10
​Figure 7, shows two rays of light incident normally on face PQ of a glass prism, whose critical angle is 42°.
​Complete the diagram to show the paths of the two rays as they pass through the prism.
K.C.S.E Physics Q & A - MODEL 2011PP2QN09
​Figure 6, shows standing waves on a string. It is drawn to a scale of 1:5
​(a) Indicate on the diagram the wavelength of the standing wave.
(b) Determine the wavelength of the wave. K.C.S.E Physics Q & A - MODEL 2011PP2QN07&8
​Figure 5, shows a motor connected to a magnetic switch called a relay operated by an ordinary switch S1 Use the information in the figure to answer questions 7 and 8.
​Explain how the relay switches on the motor when S1 is closed.
State with a reason the effect on the motor, the iron core is replaced with a steel core and switch S1 is put on and then off.
ANSWERS
K.C.S.E Physics Q & A - MODEL 2011PP2QN06
​One method of producing a weak magnet is to hold a steel rod in the North South direction and then hammer it continuously for some time. Using the domain theory of magnetism explain how this method works.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP2QN04&5
Figure 4. shows the cross-section of a dry cell. Use the information on the figure to answer questions 4 and 5.
​Name the parts labelled A and B.
State the use of the manganese (IV) oxide in the cell.
answers
​4. A = Carbon rod(+);
B = Manganese (VI) oxide 5. Manganese (IV) oxide is a depolarizer/oxidizing agent; K.C.S.E Physics Q & A - MODEL 2011PP2QN03
​Figure 3, shows a voltmeter connected across two charged parallel plates.
​When a thin sheet of mica is inserted between the plates, the voltmeter reading is observed to reduce. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2011PP2QN02
​Figure 2, shows two identical pithballs A and B suspended with insulated threads. They are
separated by an insulator X. A is positively charged while B is negatively charged. The quantity of charge on A is three times the quantity of charge on B.
​Sketch on the space besides the figure, the final position of the pithballs after the insulation removed.
K.C.S.E Physics Q & A - MODEL 2011PP2QN01
​Figure 1, shows an object placed in front of a plane mirror.
​Sketch the image of the object as seen in the mirror.
K.C.S.E Physics Q & A - MODEL 2011PP1QN019
​(a) State the condition necessary for a body to float in a fluid.
(b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water. Explain this observation. (c) Figure 17 shows three stages of an experiment to determine relative density of cork which normally floats on water. To make it sink, a sinker is hung below the cork.
​In (1) a spring balance is used to measure the weight W of the cork in air.
In (II) the spring balance is used to measure the apparent weight W1, when only the sinker is submerged in water. In (Ill) the spring balance is used to measure the apparent weight W2 when both the cork and the sinker are submerged. The following observations were made. W = 0.08N W = 0.60N W2 = 0.28N Use this information to determine the: (i) Upthrust on cork. (ii) relative density of cork. (d) Figure 18 shows parts of a simple submarine, a ship that can travel both on water and under water. To do this water is pumped in or out of the ballast tanks.
​Explain how the tanks are used to change the depth of the submarine.
K.C.S.E Physics Q & A - MODEL 2011PP1QN18
(a) Figure 15 shows a metal bolt which is threaded.​
Explain how a metre rule can be used to measure the pitch (distance between adjacent peaks) of the threading.
(b) Figure 16 shows a screw jack whose screw has a pitch of 1mm, and has a handle of 25 cm long.
Determine the velocity ratio of the jack.
(c) A bullet of mass 60g travelling at 800m/s hits a tree and penetrates a depth of 15 cm before coming to rest. (i) Explain how the energy of the bullet changes as it penetrates the tree. (ii) determine the average retarding force on the bullet. K.C.S.E Physics Q & A - MODEL 2011PP1QN17
​(a) When the temperature of water reaches the boiling point, bubbles rise to the surface.
(î) State what is contained in the bubbles. (ii) State the reason why bubbles rise to the surface only at the boiling point. (b) Figure 14 shows a graph of vapour pressure against the temperature of water vapour, in a laboratory where a mercury barometer indicates a height of 61.8 cm. (b) (i) Determine the atmospheric pressure in the laboratory in Nm-2.
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