K.C.S.E Physics Q & A - MODEL 2006PP1QN05
​The spiral springs shown in figure 4 are identical. Each spring has a spring constant k= 300N/m
​Determine the total extensions caused by the 90N weight. ( ignore the weight of the spring and connecting roots)
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K.C.S.E Physics Q & A - MODEL 2005PP2QN05
​(a) State Hooke's law
(b) One of a piece of a rubber was fixed to a rigid support and the other end pulled with a force of varying magnitude. The graph in fig 6 shows the relationship between the force (N) and the extension (cm)
Using the graph, determine
(i) The stretching force at the elastic limit (ii) The tensile stress in the rubber at an extension of 5 cm if the cross-section of the rubber is 0.25cm2 (iii) The tensile in the rubber at an extension of 5cm if the original length was 2 m (c) In Fig 7. girders AB, BC, CD, ED, EB and BD were joined to make the rigid structure shown. The load W hangs from the structure as shown.
Which of the girders can be replaced with strings without affecting the structure?
K.C.S.E Physics Q & A - MODEL 2005PP2QN04
​Explain how doping producers an n-type semi-conductor for a pure semi-conductor material.
b) Fig 5. Shows the circuit of a rectifier using four diodes D1, D2, D3 and d4.
(i) Explain how a rectified output is produced from the set – up when an a.c input is connected across AB
(ii) On the axis provided sketch the graph of output voltage against time for rectifier (iii) A capacitor is now connected across XY. Explain the effect of the capacity on the output. (c) A transistor in a common-emitter amplifier has life = 120. A signal in the input causes the base corresponding change in the output voltage if the load resistance is 100n. K.C.S.E Physics Q & A - MODEL 2005PP2QN03
3 When the switch is closed determine the:
(i) Ammeter reading (ii) Charge on each conductor K.C.S.E Physics Q & A - MODEL 2005PP2QN02
​ a) Fig 2. Shows a wheel and axle being used to raise a load W by applying an effort F The radius of the large wheel is R and of the small wheel r as shown.
​(i) Shows that the velocity ratio (V.R) of this machine is given by R/r
(ii) Given that r= 5cm, r=8cm, determine effort required to raise a load of 20N if the efficiency of the machine is 80% (iii) It is observed that the efficiency of the machine increases when it is used to lift large loads. Give a reason for this. K.C.S.E Physics Q & A - MODEL 2005PP2QN01
a) Describe with aid of a labeled diagram an experiment to determine the focal length of the lens when provided with the following; an illuminated object, convex lens, a lens, a lens holder, a plane mirror and a metre rule.
b) A small vertical object is placed 28cm in front of a convex lens of focal length 12cm. On the grid provided, draw a ray diagram to locate the image. The lens position is shown. (Use a scale; 1cm rep re 4cm) Determine the image distance. c) Fig 1 shows a human eye with a certain defect
​(i) Name the defect
(ii) On the same diagram, sketch the appropriate lens to correct the defect and sketch rays to show the effect of the lens. K.C.S.E Physics Q & A - MODEL 2004PP2QN05
​ a) Fig 6 shows a simple generator. The coils are rotated in the anticlockwise direction as shown
i) Indicate using an arrow on the figure, the direction of the induced current as the coil passes the position shown.
ii State two ways of increasing the magnitude of the induced current in this type of generator. iii) On the axes provided, sketch the graph of the induced e.m.f with time. iv) The section marked XY is cut off and a diode inserted. On the axes provided, sketch the graph of p.d across the resistor R, against time
​b) Fig 7 shows pendulum A and pendulum B freely suspended between the poles of identical magnets. Pendulum a is made of thick copper plate while B is made a copper plate with slot
​When the two are set to swing, it is observed that A slows down faster then B Explain this observation.
c) An alternating current source has a root-mean-square potential difference of 12,V, Determine the peak value of this potential difference. K.C.S.E Physics Q & A - MODEL 2004PP2QN04
​a) Fig 5 shows the displacement time graph of a wave traveling at 200cm/
​Determine for the wave the
i) Amplitude ii) Period iii) Frequency iv) Wavelength b) i) In the space provided below, sketch a labeled diagram to show how pinhole camera forms an image of a vertical object placed in front of the pinhole. ii) a building standing 200m from a pinhole camera produces on the screen of the camera an image 2.5cm high 5.0cm behind the pinhole. Determine the actual height of the building K.C.S.E Physics Q & A - MODEL 2004PP2QN03
​ Figure 4 shows the cross-section of a diffusion cloud chamber used to detect radiation from radioactive sources.
a) i) State one function of each of the following:
Alcohol solid Co2 ii) When radiation from the source enters the chamber, some white traces are observed. Explain how these traces are formed and state how the radiation is identified. iii) A leaf electroscope can also be used as a detector of radiation. State two advantages of the diffusion cloud chamber over the leaf electroscope as a detector. b) i) Two samples of the same radioactive material have initial masses M and 2M respectively. On the axes provided, sketch the graph of activity versus time for each sample. Label the graph for each sample. ii) A radioactive sample of half-life 130 days initially has 1.0 x 102c radioactive atoms. Determine the number of radioactive atoms that have decayed after 390 days.K.C.S.E Physics Q & A - MODEL 2004PP2QN02
​ a) In an experiment to determine the power of an electric heater, melting ice was place in a container with an outlet and the heater placed in the ice as shown in Fig. 2. The melted ice was collected.
​i) Other than the current and voltage, state the measurement that would be taken to determine the quantity of heat absorbed by the melted ice in unit time.
(ii) If the latent heat of fusion of ice is L, show how measurement in (i) above would be used in determining the power P. of the heater. (iii) It is found that the power determined in this experiment is lower than the manufacturer‟s value indicated on the heater. b) Fig 3 shows part of an experimental set up for estimating the diameter of an oil molecule.
i) Describe how the oil patch is formed
ii) In an experiment the diameter a, of the patch was measured to be 200mm for an oil drop of radius 0.25mm. Determine the diameter of the molecule of the oil. K.C.S.E Physics Q & A - MODEL 2004PP2QN01
​a) A test tube of uniform cross-section loaded so that it can float upright in water. With the aid of a labeled diagram, describe how the test tube may be calibrated to measure the density of liquid.
​b) In an experiment to determine the density of a liquid, a uniform metal cylinder of cross-section area 6.2cm was hang from a spring balance and lowered gradually into the liquid. The up thrust was determined for various submerged lengths. The results obtained are shown on the graph in Fig 1.
Using graph, determine;
(i) The value of the up thrust when the cylinder is fully submerged (ii) The Density of the liquid K.C.S.E Physics Q & A - MODEL 2003PP2QN05
a) States what is meant by electromotive force (em.f) of battery.
b) The graph in figure 5 shows the terminal voltage, V, of a certain battery varies with the current, I, being drawn from the battery.
​(i) Write an expression relating the e.m.f. E, terminal voltage, V, current, I and the internal resistance, r, of the battery for the circuit drawn in
(i) above. (iii) From the graph determine the; I internal resistance, r, of the battery. (C) A galvanometer of resistance 10ohms gives a full-scale deflection when a current of 0.03A flows through it. Determine the resistance of the resistor, which would be required to convert the galvanometer to an ammeter reading up to 3.0a K.C.S.E Physics Q & A - MODEL 2003PP2QN04
​a) Figure 3 shows a transverse wave traveling along x-axis.
​(i) Determine the:
I Wavelength of the wave II Amplitude of the wave. (ii) If the time taken by the wave to move from 0 to A is 0.09 seconds, determine the: I Frequency of the wave. II Speed of the wave b) Figure 4 shows a Geiger muller (GM) tub
(i) Give the reason why the mica window is made thin.
(ii) Explain how the radiation entering the tube through the window is detected by the tube. (iii) What is the purpose of the halogen vapour K.C.S.E Physics Q & A - MODEL 2003PP2QN03
​a) State what is meant by the term "specific latent heat of vaporization"
b) In an experiment to determine the specific latent heat of vaporization of water, steam at 100C was passed into water contained in a well-lagged copper calorimeter. The following measurements were made; (i) Determine the: I Mass of condensed steam II Heat gained by water Heat gained by calorimeter
​(ii) Given that L is the specific latent heat of vaporization of steam,
I write an expression for the heat given out steam. II Determine the value of L. K.C.S.E Physics Q & A - MODEL 2003PP2QN02
​a) A crane lifts a load of 200kg through a vertical distance of 3.0m in 6 seconds.
Determine: (i) Work done (ii) Power development by the crane. (iii) Efficiency of the crane given that it is operated by an electric motor rated 12.5kW. (b) A child of mass 20kg sits on a swing of length 4m and swings through a vertical height of 0.9m as shown in figure 2.
​Determine:
(i) Speed of the child when passing through the lowest point. (ii) Force exerted on the child by the seat of swing when passing through the lowest point. K.C.S.E Physics Q & A - MODEL 2003PP2QN01
​a. Fig 1 shows the displacement time graph of the motion of a particle
State the nature of the motion of the particle between:
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