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
0 Comments
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
K.C.S.E Physics Q & A - MODEL 2013PP2QN02
Explain why the image formed in a pin hole camera gets blurred when the hole is enlarged.
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN01State the reason why when a ray of light strikes a mirror at 900, the reflected ray travels along the same path as the incident ray.
answer
K.C.S.E Physics Q & A - MODEL 2013PP1QN18
(a) Figure 12 shows a weighing balance on which a beaker containing some water is placed. The reading on the balance is 2.80 N. A metal block weighing 2.7 N is suspended from a spring balance
(i) State what is observed on the spring balance and the weighing balance, as the metal block is gradually lowered into the water.
(I) Observation on spring balance. (II) Observation on weighing balance. (ii) Explain the observation made on the spring balance in (I). (iii) When the metal block is fully immersed in the water, the reading on the spring balance is found to be 2.46 N. Determine the: (I) reading on the weighing balance. (II) density of the metal. (c) Figure 13 shows a hydrometer with a thin stem floating in water in a beaker.
State with a reason what is observed on the hydrometer when the temperature of the water is raised.
K.C.S.E Physics Q & A - MODEL 2013PP1QN17Figure 11 shows an insulated cylinder fitted with a pressure gauge, a heating coil and a frictionless piston of cross-sectional area 100 cm2.(a) While the piston is at position O, the pressure of the enclosed gas is 10 Ncm-2 at a temperature of 27°C. When a 10 kg mass is placed on the piston, it comes to rest at position A without change in the temperature of the gas.
|
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
|
We Would Love to Have You Visit Soon! |
Hours24 HR Service
|
Telephone0728 450425
|
|
8-4-4 materialsLevels
Subjects
|
cbc materialsE.C.D.E
Lower Primary
Upper Primary
Lower Secondary
Upper Secondary
|
teacher support
Other Blogs
|