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.
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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 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 2013PP2QN018
​(a) Figure 11 shows plane light waves in air incident on a convex lens whose principal focus is F, the waves move past point G.
​Complete the diagram to show the pattern of the emergent waves between the lens and point G.
(b)Figure 12 shows crests of circular water waves spreading from two points A and B due to a vibrator. C and D are points on the surface of the water.
​Given that the amplitude of each wave is 5 cm, state with a reason the amplitudes of the waves at point:
(i) C; (ii) D. (c) Figure 13 shows a standing wave formed when a string of length 1 .5 m stretched between two supports is plucked in the middle.
​(î) Explain how the standing wave is formed.
(ii) Determine the wavelength of the standing wave. K.C.S.E Physics Q & A - MODEL 2013PP2QN017
(a) Figure 9 shows a cathode ray tube in which a beam of electrons is cast on the screen.
​(i) state how the electrons are produced in the tube.
(ii) state how the electron beam is detected. (iii) State the reason for having a variable potential difference (p.d.) at the: (I) grid; (II) anodes. (b) Figure 10 shows the waveform of a signal applied at the y-plates of an oscilloscope whose time-base is switched to the scale of 2 milliseconds per centimeter.
​Determine:
(i) the period of the signal; (ii) the frequency of the signal. K.C.S.E Physics Q & A - MODEL 2013PP2QN16
​(a) Two points A and B have a potential difference of V volts. Q coulombs of charge flow between A and B for t seconds. Determine:
(i) the electrical energy transformed between the two points in terms of Q. (ii) the power transformed in terms of Q and t. (iii) show that the power transformed is given by P = IV.
​(b) The lighting circuit in a house has 20 lamps each rated 60 W, 240 V. Determine whether a fuse rated 4 A can be used in the circuit when all the lamps are put on.
K.C.S.E Physics Q & A - MODEL 2013PP2QN15
​(a) Explain how a positively charged electroscope gets discharged when the cap is touched with a finger.
(b) Figure 7 shows capacitors A and B connected in series with a battery of e .m .f 4 V.
​Determine:
(ï) the effective capacitance of the circuit. (ii) the quantity of charge in capacitor A. (iii) the quantity of charge in capacitor B. (c) Figure 8 shows an isolated negative point charge Q.
​On the figure. sketch the electric field pattern around the charge.
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 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
K.C.S.E Physics Q & A - MODEL 2013PP2QN10
​Figure 5 shows a narrow beam of x-rays passing between two metal plates in air. The plates are connected in series with a switch, a cell and a milliameter.
​It is observed that when the switch is closed a current flows in the milliameter. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN09
In domestic wiring systems lamps in the lighting circuit are required to be in parallel and not in series. State two reasons for this requirement.
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN08
​Figure 4 shows a simple transformer connected to a 12 V a.c. source and an a.c. voltmeter.
​By counting the number of turns in each coil, determine the reading on the voltmeter.
K.C.S.E Physics Q & A - MODEL 2013PP2QN07
​The equation below represents a nuclear reaction in which two deuterium nuclei fuse to form Helium and X.
​(a) Determine the values of a and b.
(b) Identify X.
answers
K.C.S.E Physics Q & A - MODEL 2013PP2QN06
Figure 3 shows a ray of light passing into a glass prism ABC.
Sketch the path of the ray as it travels from face AC. (critical angle for glass is 42o)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 2013PP2QN04
​Figure 1 shows a cell of e.m.f. 2 V connected in series with a resistor R and a switch S. Voltmeters V1 and V2 are connected across the cell and the resistor respectively.
​(a) State the reading of V1 with S open.
(b) With S closed, V1 reads 1.6 V. State the reading of V2.
answer
​(a) 2V
(b) 1.6V
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
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