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K.C.S.E Physics Q & A - MODEL 2018PP2QN19

29/7/2020

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K.C.S.E Physics Q & A - MODEL 2018PP2QN19

​Figure 8 shows two waves of nearly equal frequency produced simultaneously.
Picture
​On the space provided, sketch the resultant of the two waves (beats). 
(b) Figure 9(a) and 9(b) show barriers placed in the path of plane waves.
Picture
On each figure, sketch the pattern of waves after they pass the barrier.
(c) Figure 10 shows a displacement—distance graph for a certain wave motion.
Picture
​(i) Indicate on the figure with letters A and B any two points that are in phase.
(ii) Determine the:
(I) amplitude of the wave 
(II) wavelength of the wave 
(iii) Given that the frequency of the waves is 50 Hz, determine the:
(I) period 
(II) speed of the wave
answers
Picture
Picture
Picture
Picture
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K.C.S.E Physics Q & A - MODEL 2018PP2QN18

29/7/2020

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K.C.S.E Physics Q & A - MODEL 2018PP2QN18

​(a) (i) Draw a circuit diagram showing the depletion layer of a p—n junction diode connected in the reverse bias mode. 
(ii) State the reason why increasing the external voltage in (i) makes the depletion layer wider.
(iii) State the meaning of breakdown voltage of a junction diode. 
(iv) State one application of diodes. 
(b) Figure 7 shows the output on a screen of a CR0 when an a.c. signal is connected to the Y-plates with the time base on.
Picture
​(i) Given that the time control is 5 ms per division and the y-gain is 100 V per division determine the:
(I) frequency of the ac. signal 
(II) peak voltage of the input signal 
(ii) State the adjustment that may be made in order to halve the frequency of the a.c. signal.
answers
Picture
​(ii) The holes and the electrons in their respective regions are attracted away from the junction by the external voltage.
(iii) The voltage at which the diode begins to conduct in the reverse bias mode.
(iv) In rectification circuits for changing a.c. to d. c.
In control of voltages of Zener diode.
Picture
​(iii) Double the time control to 10ms per division.
Adjust the frequency of the source to half the value
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K.C.S.E Physics Q & A - MODEL 2018PP2QN17

29/7/2020

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K.C.S.E Physics Q & A - MODEL 2018PP2QN17

​(a) Water waves from a certain Source move from the shallow end to the deep end. State the change that occurs at the deep end on the following:
(i) Frequency 
(ii) Wavelength 
(iii) Velocity 
Picture
​(b) (i) A biconvex lens forms an upright image twice the size of the object. If the focal length of the lens is 20cm, determine the object distance. 
(ii) State two optical instruments which produce a magnified real image using a Convex lens. 
(c) State one difference between the working of the human eye and the lens of a camera. 
(d) A lens of focal length 2Ocm forms a virtual image when an object is placed 60cm from the lens. State with a reason the type of lens used.
answers
(a)(i) No change in frequency
(ii) Wavelength increases
(iii) Velocity increases
Picture
(ii) a film projector
A compound microscope
(c) In a camera focusing is done by changing the distance between the lens and the film. While in the eye focusing is done by changing the curvature of the lens.
d) Diverging lens 
Forms a virtual image when the object distance is greater than the focal length.
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K.C.S.E Physics Q & A - MODEL 2018PP2QN16

29/7/2020

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K.C.S.E Physics Q & A - MODEL 2018PP2QN16

​(a) State the meaning of the following terms:
(i) Photoelectric effect 
(ii) Threshold frequency 
(b) Figure 5 shows some light incident on the cathode of a photocell. The photocell is connected in series with a battery, a variable resistor and a microammete
Picture
​(î) Explain how the microammeter reading is affected when the intensity of the incident light is increased. 
(ii) State the reason why the tube is evacuated 
(c) Figure 6 shows a graph of maximum kinetic energy (KE max) of photoelectrons against the frequency of the incident radiation.
Picture

From the graph, determine:
(i) Plank’s constant h,
(ii)the threshold wavelength given that the speed of light C is 3.0 x 108ms-1

answers
​(a)(i) The emission of electrons from a metal surface when light/electromagnetic radiations shine on it. 
(ii) The minimum frequency of radiation required to eject electrons from a metal surface. 
(b)(i) Increased intensity increases the number of electrons emitted hence a higher current reading on the microammeter. 
(ii) To minimize collisions between electrons and air molecules which would cause loss of energy. 
Picture
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K.C.S.E Physics Q & A - MODEL 2018PP2QN15

29/7/2020

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K.C.S.E Physics Q & A - MODEL 2018PP2QN15

​(a) Electrical energy is transmitted at very high voltages and low current
(i) Describe how the high voltages are attained 
(ii) State two reasons why thick aluminum wires are preferred to Copper Wires for transmission Over long distances 
(b) Figure 4 shows an electric cooker connected to the mains supply, X,Y and Z are the mains wires
Picture
​State with a reason the name of wire Y. 
(c) A student has some coloured bulbs rated 60 W, 240 V to be connected for decorations.
(i) State the number of such bulbs that can be connected normally to a 240V supply through a 5A fuse. 
(ii) If the cost of electric energy is Ksh 3.00 per kWh, determine the cost of running the bulbs in (c) (i) for 5 hours daily for 20 days. 
answers
(a)(i) By use of step-up transformers low input voltages are stepped up to high voltages for transmission. 
(ii) They are cheaper 
They are lighter, lower density / lower weight
b) Y is the earth wire, it is connected to the casing of the cooker
Picture
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