K.C.S.E Physics Q & A - MODEL 2015PP1QN02
​ Figure 2 (a) shows the initial reading of a burette used to measure the volume of oil. After 50 drops of the oil were run out, the final reading was as shown in . Figure 2 (b)
​Determine the volume of one drop of oil.
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K.C.S.E Physics Q & A - MODEL 2015PP1QN01
Figure 1 shows part of the main scale of a vernier callipers.​
​Insert the vernier scale to the main scale, to show a reading of 3.14 cm.
K.C.S.E Physics Q & A - MODEL 2014PP2QN018
​Figure 11 shows an object placed 10cm infront of a concave mirror whose radius of curvature is 40 cm.
​(a) (i) On the same figure, draw a ray diagram to show the position of the image formed.
(ii) Use the ray diagram to determine: (I) the image distance. (II) the magnification. (iii) State where the position of the image would be if the object had been placed at the principal focus. (b) Draw a ray diagram to show the formation of a partially dark shadow and a totally dark shadow during the eclipse of the sun. K.C.S.E Physics Q & A - MODEL 2014PP2QN017
(a) Figure 9 shows two speakers and S2 which produce sound of the same frequency.
They are placed equidistant from a line AB and a line PQ. (PQ is perpendicular to line AB).
​(i) A student walking from A to B hears alternating loud and soft sounds. Explain why at some point the sound heard is soft.
(ii) The student now walks along line PQ. State with reason the nature of the sound the student hears. (b) Figure 10 shows sound waves in air produced by a vibrating tuning fork. R is an air molecule on the path of the waves.
​(i) Using a line, indicate on the diagram a distance d equal to one wavelength of the wave.
(ii) In the space provided, show with an arrow the direction of motion of the air molecule R as the waves pass. (iii) Explain the reason for the answer in (ii).
answers
​(a) (i) (I) sound is soft when the waves arrive out of phase;such waves undergo destructive interference.
(ii) same sound — loud. Along PQ the waves undergo constructive interference as they arrive in phase.
​(iii) As the longitudinal waves pass molecule R moves along to either side.
For a crest. R moves away from source. K.C.S.E Physics Q & A - MODEL 2014PP2QN07
​Figure 4 shows the magnetic field pattern around two bar magnets placed side by side.
​Indicate on the diagram the poles of each magnet.
K.C.S.E Physics Q & A - MODEL 2014PP2QN05
​Figure 3 shows a nail on which a wire is to be wound to make an electromagnet.
​By drawing, show how the wire should be wound around the nail so that end A becomes a north pole and end B a south pole.
K.C.S.E Physics Q & A - MODEL 2014PP2QN01
​ Figure 1 shows two parallel rays from a distant object passing through a convex lens:
​(a) Indicate on the diagram, the position of the principal focus of the lens.
(b) Determine the focal length of the lens. K.C.S.E Physics Q & A - MODEL 2014PP1QN14
​In a smoke cell experiment to demonstrate Brownian motion, smoke particles are seen moving randomly. State the cause of the randomness.
answer
K.C.S.E Physics Q & A - MODEL 2014PP1QN13
​Figure 8 shows a graph of the variation of temperature with time for a pure substance heated at a constant rate.
​Assuming that heat transfer to the surroundings is negligible, state the changes observed on the substance in region:
(a) BC; (b) DE.
answers
​(a) BC Solid changes to liquid
(b) DE Liquid changes to vapour K.C.S.E Physics Q & A - MODEL 2014PP1QN11
​Figure 7 shows an incompressible fluid flowing through a pipe, A1 and A2 are the cross-sectional areas of the pipes in the larger section and smaller section of the pipe respectively, while V1 and V2 are speeds of the fluid at the two sections of the pipe.
​Derive an expression for the ratio of the speeds V2/V1 in terms of A1 and A2.
K.C.S.E Physics Q & A - MODEL 2014PP1QN10
​A light spiral spring extends by 4 mm when loaded with a weight W. The spring is connected in series with an identical spring. The combination is loaded with the weight W. Determine the extension of the combination.
K.C.S.E Physics Q & A - MODEL 2014PP1QN09
​Figure 6 shows two identical rods JK and LK connected with a hinge at K.
​The position of the centre of gravity for the system is at P. The arrangement is now adjusted so that J and L move equal distances towards O. Sketch the new arrangement on the same diagram and mark the new position of the centre of gravity.
K.C.S.E Physics Q & A - MODEL 2014PP1QN08
​Figure 5 shows a tin uniform rod 4 m long and of mass 2 kg. h is pivoted 1 m from one end and balanced horizontally by a string attached near the other end
​Determine the position where a mass of 5 kg should be placed on the rod so that the rod remains horizontal and the tension in the string is zero.
K.C.S.E Physics Q & A - MODEL 2014PP1QN06An oil drop of volume V m3 introduced on the surface of water spreads to form a patch whose area is A m2. Derive an expression for obtaining the diameter, d of a molecule of oil.K.C.S.E Physics Q & A - MODEL 2014PP1QN02
​ Figure 1 shows a magnified scale of a micrometer screw gauge.
​Record the reading indicated.
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN019
​(a) Figure 14 shows an E shaped steel block being magnetized by a current through two coils in series.
​On the figure, indicate
(i) the north and south poles of the resulting magnet (ii) the complete magnetic field pattern between the poles. (b) Figure 15 shows the permanent magnet made in part (a) above.
​A coil wound loosely on the middle limb is connected in series with a low voltage a.c. and a switch. State and explain the observation made on the coil when the switch is closed.
(c) In a simple cell, the zinc plate gets negatively charged and the copper plate gets positively charged. (i) Name the electrolyte in the cell. (ii) Explain how: (I) Zinc gets negatively charged. (II) Copper gets positively charged (iii) State what constitutes the current when a wire is used to connect the zinc plate and the copper plate externally.
answers
K.C.S.E Physics Q & A - MODEL 2013PP2QN14
​Figure 6 shows two convex lenses A and B used to produce a magnified virtual image of an object.
​(a) Determine the focal length of lens A. (Take unit to represent 10cm).
(b) State the function of: (i) lens A (ii) lens B (c) State how the functions in (b) are achieved by: (i) lens A (ii) lens B (d) Determine the magnification produced by: (i) lens A: (ii) the whole system.
K.C.S.E Physics Q & A - MODEL 2013PP2QN11
Explain the fact that radiant heat from the sun penetrates a glass sheet while radiant heat from burning wood is cut off by the glass sheet.
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN05
​Figure 2 shows the image of an object formed by reflection in a converging mirror. C is the centre of curvature of the mirror
​Complete the diagram to show:
(a) how incident rays are reflected to form the image; (b) the object position.
K.C.S.E Physics Q & A - MODEL 2013PP2QN03
State the reason why the magnetic field strength of a magnet is greatest at the poles.
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN02
Explain why the image formed in a pin hole camera gets blurred when the hole is enlarged.
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN01State the reason why when a ray of light strikes a mirror at 900, the reflected ray travels along the same path as the incident ray.
answer
K.C.S.E Physics Q & A - MODEL 2013PP1QN13
​ A drop of blue ink is introduced at the bottom of a beaker containing water. It is observed that after some time, all the water in the beaker turns blue. Name the process that takes place.
answer
​K.C.S.E Physics Q & A - MODEL 2013PP1QN12
State why it is necessary to leave an air space in a closed glass bottle of water when it is to be kept in a refrigerator.
answer
K.C.S.E Physics Q & A - MODEL 2013PP1QN08
Figure 4 shows a uniform metre rule of weight 1 N with two weights of 0.18 N and 0.12 N suspended from its ends.
​Determine how far from the 0.18 N weight a pivot should be placed in order to balance the meter rule.
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