K.C.S.E Physics Q & A - MODEL 2019PP2QN11
Figure 5 shows part of the lighting circuit in a house.
State two errors in the wiring circuit.
answers
0 Comments
K.C.S.E Physics Q & A - MODEL 2019PP2QN10
State how the intensity of X-rays in an X-ray tube can be increased.
answer
K.C.S.E Physics Q & A - MODEL 2019PP2QN09
Figure 4 shows the input and output signals on a CRO screen when two diodes are used during a full wave rectification.
Explain how the two diodes rectify the input signal.
answers
K.C.S.E Physics Q & A - MODEL 2019PP2QN08
State two uses of gamma rays in medicine.
answers
K.C.S.E Physics Q & A - MODEL 2019PP2QN07
Figure 3 shows a cell connected in series with an ammeter, a 2 ohms resistor and a switch.A voltmeter is connected across the cell.
With the switch open, the voltmeter reads 1.5 V. Given that the internal resistance of the cell is 0.5 ohms , determine the ammeter reading when the switch is closed.
K.C.S.E Physics Q & A - MODEL 2019PP2QN06
State the reason why the current produced by a simple cell falls rapidly when the cell is being used,
answer
K.C.S.E Physics Q & A - MODEL 2019PP2QN05
In a siren, sound is produced when a jet of air is directed perpendicular to a ring of holes on a rotating wheel. Explain the effect on the pitch of sound produced when the speed of rotation of the wheel is increased.
answer
K.C.S.E Physics Q & A - MODEL 2019PP2QN04
Figure 2 shows an incomplete circuit for an electromagnet.
(a) Complete the diagram to show how a battery should be connected at A so that the polarities at P and Q are South and North respectively.
(b) State two ways in which the strength of the electromagnet in (a) can be increased.
K.C.S.E Physics Q & A - MODEL 2019PP2QN03
State two properties of magnetic field lines around a bar magnet.
answers
K.C.S.E Physics Q & A - MODEL 2019PP2QN02
State the reason why an increase in leaf divergence is the only sure way of determining whether an object is negatively charged using a negatively charged electroscope.
answer
K.C.S.E Physics Q & A - MODEL 2019PP2QN01
Figure 1 shows two plane mirrors inclined at an angle of 120 to each other. A ray of light makes an angle of 40° with the first mirror.
By completing the ray diagram determine the angle of reflection on the second mirror.
K.C.S.E Physics Q & A - MODEL 2018PP2QN19
Figure 8 shows two waves of nearly equal frequency produced simultaneously.
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.
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.
(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 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.
(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
(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.
(iii) Double the time control to 10ms per division.
Adjust the frequency of the source to half the value 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
(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
(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. 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
(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. From the graph, determine:
|
CATEGORIES
Categories
All
Topics
FORM I - PHYSICS SYLLABUSFORM II - PHYSICS SYLLABUSTOPICS
FORM III - PHYSICS SYLLABUSFORM IV - PHYSICS SYLLABUSARCHIVES
RSS FEEDS
AUTHOR
M.A NyamotiMy passion is to see students pass using right methods and locally available resources. My emphasis is STEM courses
|
Primary Resources
College Resources
Can't find what you want? Use this Search box. |
Secondary Resources
|
Contact Us
Manyam Franchise
P.O Box 1189 - 40200 Kisii Tel: 0728 450 424 Tel: 0738 619 279 E-mail - sales@manyamfranchise.com |