The figure below shows the path of a ray of light passing through a rectangular glass block placed in airCalculate the refractive index of glass (2mks)
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The figure below shows an object placed in front of a concave mirror. By use of correct ray diagram, locate the position of imageSolution
The figure bellows shows a wave profile for a wave whose frequency is 2HZDetermine the value of t3(s) (2mks)Solution
(a) A 240v mains transformer has 800 turns in the primary and N turns in the secondary. It is used to supply energy to a 12v/21w lamp. (i) Calculate the number of turns in the secondary (2mks)(ii) What is the efficiency of the transformer if the current drawn from the 240V mains is 100mA (2mks)
Calculate.(i) the reading of voltmeter, V, with, S, open (2mks)(ii) the reading of the ammeter A with S closed (neglect the effective resistance of the secondary winding) (2mks)(iii) the power dissipated in the lamp (2mks)(iv) the primary current if the transformer is 90% efficient (3mks)
(a) Explain why bulbs in along corridor are not wired in series (2mks)
(b) An electric cooker has an oven rated 2500w, a grill rated 1500w and two plates each of 1000W. This cooker operates directly from 240v supply. What is the costs of operating all the parts at once for 30 minutes if electricity costs sh.10.00 per unit? (3mks)(c) Study the figure below(i) What name is given to the fitting in the diagram (1mk)
3 pin plug
(ii) Identify the parts labeled (2mks)A
Neutral wire
B
Earth wire
C
Live wire
D
Fuse
Give two advantages of a circuit breaker instead of a fuse in domestic wiring (2mks)
Give a reason why gases are poor transmitters of sound (1mk)
Molecules in gases are much further apart
A student set-up the apparatus as shown below to determine the power of an electric heater.19/10/2021 (a)
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FORM I - PHYSICS SYLLABUSFORM II - PHYSICS SYLLABUSTOPICS
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M.A NyamotiMy passion is to see students pass using right methods and locally available resources. My emphasis is STEM courses
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