K.C.S.E Physics Q & A - MODEL 2014PP2QN08
​Figure 5 shows a graph of current against voltage for a semiconductor diode.
​In the space provided, draw a circuit diagram that may be used to obtain values needed to draw the graph in figure 5.
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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 2014PP2QN06
It is observed that when the cap of an uncharged electroscope is irradiated with light of high frequency, the leaf of the electroscope rises. Explain this observation.
answer
​ (a) Electrons absorb enough energy and are ejected leaving the electroscope positively charged the leaf is repelled by the stem.
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 2014PP2QN04The frequency of an electromagnetic wave is 4.0 X 106 Hz. Determine its wavelength. (take speed of light as 3.0 X 108ms-1.K.C.S.E Physics Q & A - MODEL 2014PP2QN03
​Figure 2 shows circular waves originating from the principal focus F of a concave mirror and moving towards the mirror.
​Complete the diagram to show the reflected waves.
K.C.S.E Physics Q & A - MODEL 2014PP2QN02
State the effect of decreasing the distance between the plates of a parallel plate capacitor on the capacitance.
answer
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 2014PP1QN12
​On the axis provided, sketch the graph which shows the relationship between volume and temperature of a fixed mass of water in the temperature range 0°C to 10°C
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 2014PP1QN07
​Figure 4 shows a source of heat placed at equal distances from two identical flasks X and Y containing air. The surface of X is painted black while Y is clear
​X and Y are linked by a U-tube filled with water whose levels S and T are initially the same.
It is later observed that S falls while T rises. Explain this observation.
answer
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 2014PP1QN05Figure 3 shows two cylinders of different cross-sectional areas connected with a tube. The cylinders contain an incompressible fluid and are fitted with pistons of cross-sectional areas 4 cm2 and 24 cm2.Opposing forces P and Q are applied to the pistons such that the pistons do not move. If the pressure on the smaller piston is 5 N cm-2. Determine force Q.K.C.S.E Physics Q & A - MODEL 2014PP1QN04
​Figure 2 shows a section of a curved surface ABCD. Point A is higher than point B while BCD is horizontal. Part ABC is smooth while CD is rough. A mass m is released from rest at A and moves towards D.
​State the changes ¡n the velocity of m between:
(a)B and C; (b) C and D.
answer
​(a) BC = Constant
(b) CD - decreasing
K.C.S.E Physics Q & A - MODEL 2014PP1QN03
State the reason why it is not correct to quote the weight of solid objects in kilograms.
answer
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 2014PP1QN01
​A student measured the length of a wire four times using a metre rule and obtained the following readings: 18.6 cm; 18.5 cm; 18.6 cm and 18.5 cm. Determine the length the student should record.
K.C.S.E Physics Q & A - MODEL 2013PP2QN13
​When a germanium crystal is doped with arsenic, it becomes an N-type semiconductor. Explain how this change occurs.
(Number of electrons in the outermost shell for germanium = 4. Arsenic = 5)
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN12
​ A photon of ultraviolet light having energy E falls on a photoemissive surface whose work function is T. Write an expression for the maximum kinetic energy of the resulting photoelectron in terms of E and T.
answer
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
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