K.C.S.E Physics Q & A - MODEL 2007PP2QN05
​Figure 4. shows the displacement – time graph for a certain wave
Determine the frequency of the wave
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K.C.S.E Physics Q & A - MODEL 2007PP2QN04
​Figure 3 shows an object, O in front of a concave mirror and its image, I formed after reflection.
​(a) On the same diagram draw appropriate ray (s) to locate the principal focus, F, of the mirror.
(b) Determine the focal length of the mirror (scale 1: 5) K.C.S.E Physics Q & A - MODEL 2007PP2QN03
​Figure 2 shows a horse – shoe magnet whose poles are labeled and two other magnets near it.
Iron are attracted to the lower ends of the n\magnets as shown.
Identify the poles marked X and Y
X ​Y
ANSWER
K.C.S.E Physics Q & A - MODEL 2007PP2QN02
State one advantage of an alkaline cell over a lead – acid cell
answer
K.C.S.E Physics Q & A - MODEL 2007PP2QN01
​Figure 1 represents a pinhole camera
​Sketch rays to show the formation of an enlarged image in the camera. Label both the object and the image
K.C.S.E Physics Q & A - MODEL 2007PP1QN19
​ (a) State the law of floating
(b) Figure 13 shows a simple hydrometer
​(i) State the purpose of the lead shots in the glass bulb
(ii)How would the hydrometer be made more sensitive? (iii) Describe how the hydrometer is calibrated to measure relative density (c) Figure 14 shows a cork floating on water and held to the bottom of the beaker by a thin thread.
​(i) Name the forces acting on the cork
(ii) Describe how each of the forces mentioned in (i) above changes when water is added into the beaker until it fills up. K.C.S.E Physics Q & A - MODEL 2007PP1QN18
​(a) State what is meant by centripetal acceleration
(b) Figure 12 shows masses, A, B and C placed at different points on a rotating table. The angular velocity of the table can be varied.
​(i) State two factors that determine whether a particular mass slides off the table or not
(ii) It is found that the masses slide off at angular velocities A, B, and C respectively. Arrange the values of A, B, C in decreasing order. (c) A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by a thin thread. The distance from the centre of the table to the block is 15 cm. If the maximum tension the thread can withstand is 5.6N. Determine the maximum angular velocity the table can attain before the thread cuts. K.C.S.E Physics Q & A - MODEL 2007PP1QN17
​(a) Define the term specific latent heat of vaporization of a substance
(b) Figure 11 shows the features of a domestic refrigerator. A volatile liquid circulates through the capillary tubes under the action of the compression pump. (i) State the reason for using a volatile liquid
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