K.C.S.E Physics Q & A - MODEL 2006PP2QN18
​Figure 8 shows an object placed in front of a concave mirror of focal length 10cm. C is the centre of curvature
​(i) On the same figure draw a ray diagram showing the location of the image
Use the ray diagram drawn in (i) above to determine the (ii) Image distance (iii) Magnification (b) A vertical object is placed 20cm in front of a convex lens of focal length 5 cm (i) Determine I. The image distance II. The magnification (ii) State two characteristics of the image
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K.C.S.E Physics Q & A - MODEL 2006PP2QN08S soldier standing some distance from a wall, blows a whistle and hears its echo 1 seconds later. How far is the wall from the soldier? ( speed of sound in air is 330ms-1)K.C.S.E Physics Q & A - MODEL 2006PP2QN07
​Figure 5 shows wave fronts approaching a concave surface
Complete the diagram to show the wave fronts formed after striking the surface. Show how the focal point of the surface is located
K.C.S.E Physics Q & A - MODEL 2006PP2QN02
​In a certain pinhole camera, the screen is 10cm from the pinhole. When the camera is placed 6m away from a tree, a sharp image of the tree 16cm high is formed on the screen. Determine the height of the tree.
K.C.S.E Physics Q & A - MODEL 2006PP2QN01
Figure 1 shows two bar magnets placed with the south poles close together
In figure 1 sketch the magnetic field pattern between the two south poles
K.C.S.E Physics Q & A - MODEL 2006PP1QN15
​(a) You are provided with two wires of same material and same thickness. Describe how you would make two spiral springs of different springs constants (assume that other apparatus to make springs are available).
(b) In an experiment, two identical springs are attached end to end. One end of the combined springs is fixed to a rigid support such that the spring hangs vertically. Masses are then hang from the lower end. The graph in figure 8 shows the relation between the force ( weight) and the extension for the combined springs
From the graph determine
(i) The elastic limit for the combined springs (ii) The springs constant of the combined spring and hence for each spring (iii) The work done in stretching the combined spring from 15 mm to 32 mm K.C.S.E Physics Q & A - MODEL 2006PP1QN14
​(a) Distinguish between solid and liquid states of matter in terms of intermolecular forces
(b) In an experiment to estimate the diameter of an oil molecule, an oil drop of diameter 0.05 cm spreads over a circular patch whose diameter is 20 cm Determine (i) The volume of the oil drop (ii) The area of the patch covered by the oil (iii) The diameter of the oil molecule
​(c) State
(i) Any assumption made in (b) (iii) above (ii) Two possible sources of errors in this experimen K.C.S.E Physics Q & A - MODEL 2006PP1QN12
​The uniform bar in figure 7 is provided at its midpoint. It is in equilibrium under the action of two identical balloons filled with equal volumes of different light gases at the same temperature.
Explain why the bar may not remain in equilibrium if the temperature of the surrounding changes.
ANSWER
K.C.S.E Physics Q & A - MODEL 2006PP1QN11A pipe of radius 6 mm is connected to another pipe of radius 9 mm. If water flows in the wider pipe at the speed of 2 ms-1, what is the speed in the narrower pipe?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)
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 2005PP1QN37
​ In the set up Fig 17 the metal rod is made up of steel and iron pieces joined end. Your are provided with two iron nails
​Explain how you would use two nails provided to determine which side is iro
ANSWERS
K.C.S.E Physics Q & A - MODEL 2005PP1QN34
Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
ANSWER
K.C.S.E Physics Q & A - MODEL 2005PP1QN30
​An illuminated vertical object is initially placed on the principal axis of a converging lens and 32cm from it. The focal length of the lens 15cm. The object is new placed at a point 12cm from the lens and on the same side. State two changes other than magnification than magnification that that are observed on the image formed due to this change.
ANSWER
K.C.S.E Physics Q & A - MODEL 2005PP1QN26
State Bernoulli's principle.
ANSWERS
K.C.S.E Physics Q & A - MODEL 2005PP1QN22
​ Fig. 12 shows a vertical object, O, placed in front of a convex mirror.
On the same diagram draw the appropriate rays and locate the image formed
K.C.S.E Physics Q & A - MODEL 2005PP1QN17
​An electronic siren producing sound continuously at a certain frequency is dropped from the top to a deep hole. State and explain what is observed about the pitch of the sound reaching the observer at the top.
answers
K.C.S.E Physics Q & A - MODEL 2005PP1QN05
In a vacuum flask the walls enclosing the vacuum are silvered on the inside. State the reason for this.
answer
K.C.S.E Physics Q & A - MODEL 2005PP1QN03
​The light uniform bar in Fig 3 is equilibrium. The two beakers A and B contain water at the same temperature. The two blocks are made of the same material.
​If the temperature of the water in beaker A is now raised, explain why the beam tips to side A.
Assume the solid does not expand.
answer
K.C.S.E Physics Q & A - MODEL 2005PP1QN02
​ Fig 2 shows a solid cylinder standing on a horizontal surface. The cylinder is in stable equilibrium
​On the horizontal space provided, sketch the cylinder in neutral equilibrium
K.C.S.E Physics Q & A - MODEL 2005PP1QN01
​ Figure 1 shows the reading on a burette after 55 drops of a liquid have been used.
If the initial reading was at Zero mark, determine the volume of one drop.
K.C.S.E Physics Q & A - MODEL 2004PP2QN06
​a) You are provided with two identical tuning forks and some plasticine.
Describe how you would demonstrate beats in sound. b) Fig 8 shows a set up that was used in an experiment to determine the speed of sound air
Turning forks of different frequencies were sounded near the mouth of the open tube and by lowering the reservoir, the list two resonant lengthsL1 L2 were ensured for each frequency.
Table 1 shows the results obtained.
​(i) Complete the table. On the grid provided, plot the graph of l2– l1 (y-axis ) against 1/f
(ii) From the graph determine the speed V of sound in air given that 12-11 = v/2r. Therefore V= 2f(12 – 11) (iii) Explain how resonance is attained in this set up. 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 2004PP1QN31
A vertical object is placed at the focal point F of a diverging lens as shown in Figure 16.
​Sketch a ray diagram to show the image of the object.
K.C.S.E Physics Q & A - MODEL 2004PP1QN23
​Figure 12 shows a parabolic surface with a source of light placed at its focal point F
​Draw rays to show reflection from the surface when rays from the source strike the surface at points ABC and D.
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