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K.C.S.E Physics Q & A - MODEL 2016PP2QN15

27/7/2020

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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.
Picture
​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%
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K.C.S.E Physics Q & A - MODEL 2014PP2QN14

23/7/2020

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K.C.S.E Physics Q & A - MODEL 2014PP2QN14

​(a) Figure 6 shows a simple electric bell circuit
Picture
​(i) Name the parts labelled:
(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 ol the bulb. 
answers
​(a) (i) I D - soft iron armature 
II E contacts 
(ii) I. Soft iron core is magnetized  and attracts the armature the hammer hits 
the gong.
II. Contact is broken  when armature is  attracted by the core. The core then loses magnetism. 
The armature loses magnetism and  springs back making contact again and the process is repeated.
Picture
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K.C.S.E Physics Q & A - MODEL 2012PP2QN07

21/7/2020

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K.C.S.E Physics Q & A - MODEL 2012PP2QN07

​Figure 7, shows two similar coils P and Q around the end L and M of a piece of soft iron. A steady current passes through the coils
Picture
​State the polarity of the resulting magnet at end L.
ANSWER
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K.C.S.E Physics Q & A - MODEL 2011PP2QN17

20/7/2020

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K.C.S.E Physics Q & A - MODEL 2011PP2QN17

​(a) State what is meant by the term “electromagnetic induction”. 
(b) Figure 9, shows a simple electric generator
Picture
​(i) Name the parts labelled P and Q. 
P .
Q
(ii) Sketch on the axes provided, a graph to show how the magnitude of the potential difference across R, changes with the time t. 
Picture
​(iii) State two ways in which the potential difference produced by such a generator can be increased.
(c) In a transformer, the ratio of primary turns to the secondary turns is 1:10. A current of 500mA flows through a 200 ohms resistor in the secondary circuit.
Assuming that the transformer is 100% efficient, determine:
(i) the secondary voltage;
(ii) the primary voltage; 
(iii) the primary current.
answers
​(a) The production of induced e.m.f when the magnetic flux linking a circuit is changed;
(b) (i) P - brushes
Q - slip rings
Picture
​(iii) Increasing number of turns/coils;
Increasing speed of rotation;
Increasing strength of field;
Winding the coil on soft iron core.
Picture
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K.C.S.E Physics Q & A - MODEL 2011PP2QN07&8

20/7/2020

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K.C.S.E Physics Q & A - MODEL 2011PP2QN07&8

​Figure 5, shows a motor connected to a magnetic switch called a relay operated by an ordinary switch S1 Use the information in the figure to answer questions 7 and 8.
Picture
​Explain how the relay switches on the motor when S1 is closed. 
State with a reason the effect on the motor, the iron core is replaced with a steel core and switch S1 is put on and then off. 
ANSWERS
  • ​7. When S is closed, current flows in solenoid magnetizing the iron core; this attracts the iron armature closing the contacts; this causes current to flow in the motor circuit:
  • Motor keeps running continuously; 
  • 8. Steel would remain permanently magnetized causing current in mortor circuit to remain when S is open.
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