State the reason why electrical power is transmitted over long distances at very high voltages.20/7/2020
K.C.S.E Physics Q & A - MODEL 2011PP2QN13
State the reason why electrical power is transmitted over long distances at very high voltages.
answer
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K.C.S.E Physics Q & A - MODEL 2011PP2QN12
​Table I shows radiations and their respective frequencies.
​Arrange the radiations in the order of increasing energy.
answer
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.
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 2011PP1QN15
​Figure 10 shows a simple pendulum of length 80cm. The pendulum bob whose mass is 50g oscillates between points A and B, through its rest position C. A and B are both 10cm higher than C
(a) (i) Indicate with an arrow, on the path ACB, the direction of the greatest velocity of the bob as it moves from A to B.
(ii) State the form of energy possessed by the pendulum bob at point A. (b) Determine: (i) the velocity of the bob at point C, (ii) the tension in the string as the bob passes point C.(take acceleration due to gravity g = 10 m/s2) (c) After some time, the pendulum comes to rest at point C. State what happens to the energy it initially possessed. K.C.S.E Physics Q & A - MODEL 2011PP1QN14
​Figure 9 shows a syringe full of water. It has two identical holes A and B drilled along it’s cylinder. The cylinder nozzle is closed.
​State with a reason how the speeds of the jets of water from A and B compare when the piston is pushed into the cylinder.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN13
​A particle starts from rest and accelerates uniformly in a straight line. After 3 seconds it is 9m from the starting point. Determine the acceleration of the particle.
K.C.S.E Physics Q & A - MODEL 2011PP1QN11&12
​Figure 8 shows a uniform wooden block of mass 2kg and length 25cm lying on a bench. It hangs over the edge of the bench by 10cm. Use the figure to answer questions l1 and 12
​Indicate on the figure two forces acting on the wooden block.
Determine the minimum force that can be applied on the wooden block to make it turn about the edge of the bench
K.C.S.E Physics Q & A - MODEL 2011PP1QN10
State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN09
​Figure 7 shows part of a petrol engine, in which air flowing under atmospheric pressure passes into a constriction, where it mixes with petrol. The mixture then flows into a combustion cylinder.
​Explain what causes the petrol to move from the petrol chamber to the air stream in the constriction when the piston is moved downwards.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN08
When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain how the molecules of the gas cause the increase in pressure.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN07
​Figure 6 shows a small toy boat floating on water in a basin. X and Y are two points near the toy.
​When a hot metal rod is dipped into the water at point X, the toy is observed to move towards Y. Explain this observation.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN06
​Figure 5 is a graph of net force on a body against it’s velocity as it falls through a liquid.
​Determine the terminal velocity of the body.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN05
​Figure 4 shows two identical beakers P and Q full of water at 90°C. Two similar cold wet clothes are wrapped, one around the top of P and the other around the bottom of Q.
​State with a reason, the beaker in which the water cools faster.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN04
​Figure 3 shows an aluminum tube tightly stuck in a steel tube.
​Explain how the two tubes can be separated by applying a temperature change at the junction given that aluminum expands more than steel for the same temperature rise.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN03
​Figure 2 shows a spring balance. It’s spring constant is 125N/m. The scale spreads over a distance of 20cm.
​Determine the maximum weight that can be measured using this spring.
K.C.S.E Physics Q & A - MODEL 2011PP1QN02
State the constant force that opposes the motion of a stone initially at rest, as it falls through air from a tail building.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN01
Figure 1 shows a lorry moving on an inclined section of a straight road. At the back is a chain hanging from a point on a horizontal axis through the centre of gravity of the lorry.​
​State with a reason whether the lorry is stable or not stable.
ANSWER
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