K.C.S.E Physics Q & A - MODEL 2017PP1QN10
State one assumption for the experiments carried out to verify the gas laws.
answer
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K.C.S.E Physics Q & A - MODEL 2017PP1QN09
​Figure 2 shows a round bottomed flask fitted with a long capillary tube containing a drop of coloured water.
​The flask is immersed in ice water for sometime. State the observation made.
answer
K.C.S.E Physics Q & A - MODEL 2017PP1QN08
Using the definition of impulsive force, show that F ma
K.C.S.E Physics Q & A - MODEL 2017PP1QN07
A stone is thrown vertically upwards. Sketch a graph of potential energy (y axis) against time as the stone moves until it hits the ground.
K.C.S.E Physics Q & A - MODEL 2017PP1QN06
State the reason why the speed of water at the narrow section of a river is higher than at the wider section.
answer
K.C.S.E Physics Q & A - MODEL 2017PP1QN05
​Figure 1 shows a uniform wooden bar at equilibrium with two cans Y and Z of equal mass but different diameters.
​The cans are simultaneously filled with equal volumes of water.
Explain the observation made.
answer
K.C.S.E Physics Q & A - MODEL 2017PP1QN04
When a liquid is heated in a glass flask, it is observed that the level at first goes down and then rises. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2017PP1QN03It is observed that when 20 cm3 of alcohol is mixed with 20 cm3 of water. the volume of the mixture is 39cm3. State a reason why the volume of the mixture is not 40 cm3.
answer
K.C.S.E Physics Q & A - MODEL 2017PP1QN02
​In an experiment to determine the density of Liquid R, a student obtained the followed data:
— Mass of an empty density bottle 550 g — Mass of the density bottle + water = 80.0 g — Mass of the density bottle + Liquid R = 70.0 g
​Determine the density of Liquid R. (density of water is 1000 kgm^3)
K.C.S.E Physics Q & A - MODEL 2017PP1QN01
In order to determine the size of an oil molecule, a student performed an experiment using five
oil drops to make a circular patch of the oil on the surface of water in a water bath. State two assumptions made by the student during the calculations. ​
answer
K.C.S.E Physics Q & A - MODEL 2016PP2QN18
​(a)State one factor that affects the speed of sound in a solid.
b)An observer stands half-way between two vertical cliffs that are L metres apart.He strikes a gong and measures the time interval, t, between the echoes heard from the two cliffs. He moves a further 10m and again strikes the gong and measures the time interval between the echoes. The process is repeated several times. The graph in Figure 13 shows the relation between the time interval, t and the distance, x from the centre. (i)From the graph, determine the value of x for which the time interval was 0.55.
​(ii)Given that t = 4x/v where v is the speed of sound in air, determine the value of v from the graph.
(iii)If the maximum time measured by the observer was t=4.7s, determine the distance L between the cliffs. (c)A search boat uses a signal of frequency 6.0 x 104 Hz to detect a sunken ship directly below. Two reflected signals are received; one after 0.1 seconds from sunken boat and the other after 0.14 seconds from the sea bed. If the sea bed is 98 m below the boat, determine:- (i)The speed of the signal in water. You may use the value of v from (ii) above. (ii)The depth of the sunken ship below the boat K.C.S.E Physics Q & A - MODEL 2016PP2QN17
​When a radiation was released into a diffusion cloud chamber, short thick tracks were observed. State with a reason, the type of radiation that was detected.
(b)The half-life of an element X is 3.83 days. A sample of this element is found to have an activity rate of 1.6 x 10^3 disintegrations per second at a particular time. Determine its activity rate after 19.15 days. (c) State what is meant by an extrinsic semiconductor. (d)Figure 11, shows a depletion layer in an unbiased p-n junction
​State how a battery can be used to make the depletion layer narrower.
(e)Figure 12, shows an incomplete circuit of a full wave rectifier.
​(i) Draw in the figure two more diodes to complete the circuit should be obtained.
K.C.S.E Physics Q & A - MODEL 2016PP2QN16
​Figure 8, shows a circuit that may be used to charge a capacitor.
(i) state the observation on the milliameter when the circuit is switched on:
(ii) explain the observation in (i) above. b)The circuit in figure 8 is left on for some time. State the value of p.d. across: (i) the resistor R; (ii) the capacitor C; (c) sketch the graph of potential difference (V) across R against time. ​(d) Figure 9 shows three capacitors connected to a 10V battery
​Calculate:
(i) the combined capacitance of the three capacitors; (ii) the charge on the 5.0 uF capacitor. K.C.S.E Physics Q & A - MODEL 2016PP2QN15
Figure 15, shows two coils A and B placed close to each other. A is connected to a steady D.C. supply and a switch, B is connected to a sensitive galvanometer.
​i)The switch is now closed, state the observation made on the galvanometer.
ii)Explain what would be observed if the switch is then opened. b) The primary coil of a transformer has 1000 turns and the secondary coil has 200 turns. The primary coil is connected to a 240V ac. Mains supply. i) Explain how an e.m.f is induced in the secondary coil. ii)Determine the secondary voltage. iii) Determine the efficiency of the transformer given that the current in the primary coil is 0.20A and in the secondary coil it is 0.80A.
answers
(a) ​(i)The galvanometer will be deflected to one side and then back to zero.
(ii)A greater deflection will be obtained in the opposite direction as the current takes less time to die off than to build up b)(i)The changing current in the primary coil induces a current in the secondary coil due to changing magnetic field of the primary current ii)Ns/Np = Vs/Vp hence Vs = (240 x 200)/1000 = 48V iii)Efficiency = power output/Power input x 100 (4.8 x 0.8 x 100)/240 x 0.2= 80% K.C.S.E Physics Q & A - MODEL 2016PP2QN14
​Figure 6 shows a simple electric bell circuit
​(i)Name the parts labeled
(I) D (II) E (ii)When the switch is closed, the hammer hits the gong repeatedly. Explain why: (I) the hammer hits the gong. (II) the hammer hits the gong repeatedly. (b) An electric bulb is rated 60 W, 240 V. Determine: (i) the current that flows through it when it is connected to a 240 V supply. (ii) the resistance of the bulb. K.C.S.E Physics Q & A - MODEL 2016PP2QN13
​A boy standing in front of a cliff blows a whistle and hears the echo after 0.5s. He then moves 17 metres further away from the cliff and blows
the whistle again. He now hears the echo after 0.6s. Determine the speed of the sound. K.C.S.E Physics Q & A - MODEL 2016PP2QN12
.When 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 2016PP2QN11
​A heater of resistance R1 is rated P watts, V volts while another of resistance R2 is rated 2P watts, V/2 volts. Determine R1 / R2
K.C.S.E Physics Q & A - MODEL 2016PP2QN10
​Figure 6 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 2016PP2QN09
Draw a ray diagram to show how a ray of light may be totally internally reflected two times in an isosceles right - angled glass prism.(Assume that the critical angle of glass is 42
K.C.S.E Physics Q & A - MODEL 2016PP2QN08
​The following is part of radioactive decay series
​Determine the values of a and b
answers
​a = 234
b= 82 K.C.S.E Physics Q & A - MODEL 2016PP2QN07
​Figure 5 shows the cross-section of a dry cell. Use the information on the figure to answer questions below
​(a) Name the parts labeled A and B.
(b) State the use of manganese (IV) oxide in the cell.
answers
​(a) A – Carbon rod or graphite rod
B – Mixture of Manganese (IV) oxide with carbon powder (b) Manganese (IV) oxide is a depolarizer or oxidizing agent. It is used to oxidize hydrogen to water K.C.S.E Physics Q & A - MODEL 2016PP2QN06
​Figure 4 shows straight waves incident on a diverging lens placed in a ripple tank to reduce its depth
​Complete the diagram to show the waves in both the shallow region and beyond the lens.
K.C.S.E Physics Q & A - MODEL 2016PP2QN05
​State the reason why a convex mirror is preferred over a plane mirror for use as a driving mirror.
answer
K.C.S.E Physics Q & A - MODEL 2016PP2QN04
​Figure 5, shows how the displacement of a point varies with time as a wave passes it.
​On the same diagram, draw a wave which passes the point with half the amplitude and twice the frequency of the one shown.
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