electricity mocks-pbai-1
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Write legiblyDo not use staples, paper clips, highlighters, glue or correction fluid.
Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided
unless this has been done for you.
DO NOT WRITE IN ANY BARCODES.
For MCQ's ; For each question there are four possible answers A, B, C and D.
Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet.
Read the instructions on the Answer Sheet very carefully.
A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet.
Electronic calculators may be used.
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REVISION PAPER FOR IGCSE-TOPIC ELECTRICITY BASED ON IGCSE PAST PAPERS
For more topic wise igcse past papers for Math/Phy/Chem/Bio Call us on 022 6563 1516/ 9819448033/ 8108736315
UCLES 2004 0625/01/M/J/04 [Turn over
32 The circuit shown contains four lamps and three switches.
lamp 1
lamp 2
lamp 3
lamp 4
switch 1
switch 3
switch 2
Which switches must be closed to light only lamps 1 and 3?
A switch 1 only
B switch 1 and switch 2 only
C switch 1 and switch 3 only
D switch 2 and switch 3 only
33 The diagram shows a torch containing two 2 V cells, a switch and a lamp.
plastic
case
brass
connecting
stripswitch
lamp
What is the circuit diagram for the torch?
CBA D
Extended-MCQ's- 14 marks
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UCLES 2004 0625/01/M/J/04
34 Which statement is correct?
A A fuse is included in a circuit to prevent the current becoming too high.
B A fuse should be connected to the neutral wire in a plug.
C An electric circuit will only work if it includes a fuse.
D An earth wire is needed to prevent the fuse blowing.
35 A straight wire carrying a current produces a magnetic field.
Which diagram shows the correct shape of the field?
current current
current current
A B
C D
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UCLES 2004 0625/01/M/J/04 [Turn over
36 A student carries out an experiment to see the effect of a magnetic field on a wire carrying a
current.
The wire moves upwards as shown.
direction
of current
N S
wire moves
upwards
What should the student do to make the wire move downwards?
A change the direction of the current
B move the poles of the magnet closer together
C send a smaller current through the wire
D use a stronger magnet
37 A beam of cathode rays passes through an electric field between two parallel plates.
+ + + + + +
_ _ _ _ _ _
cathode rays
In which direction is the beam deflected?
A into the page
B out of the page
C towards the bottom of the page
D towards the top of the page smart
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© UCLES 2008 0625/01/M/J/08 [Turn over
28 A solenoid carrying a current is used to demagnetise a bar magnet.
powersupply
solenoidbar magnet
Which conditions achieve demagnetisation?
current through solenoid
movement of bar magnet
A a.c. around the solenoid quickly
B a.c. through the solenoid slowly
C d.c. around the solenoid quickly
D d.c. through the solenoid slowly
30 Which circuit symbol represents a component used to store energy?
A B C D
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© UCLES 2008 0625/01/M/J/08
31 In the circuit shown, the switches S1 and S2 may be open (off) or closed (on).
V
12 V+
–S1
S2
switches shownopen (off)
Which line in the table shows the voltmeter reading for the switch positions given?
S1 S2 voltmeter reading / V
A open open 12
B closed closed 12
C open closed 0
D closed open 12
32 The device X in this circuit is designed to cut off the electricity supply automatically if too much current flows.
X
What is device X?
A a fuse
B a switch
C a resistor
D an ammeter smart
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© UCLES 2008 0625/01/M/J/08 [Turn over
33 The diagrams show two ways in which three lamps may be connected.
circuit 1 circuit 2
X
Y
ZX Y Z
Which statement is correct?
A If lamp Y breaks in circuit 1, both the other lamps will go out.
B If lamp Y breaks in circuit 2, both the other lamps will go out.
C If lamp Y breaks in circuit 1, lamp Z will go out, but lamp X will remain on.
D If lamp Y breaks in circuit 2, lamp Z will go out, but lamp X will remain on.
34 The wire XY shown in the diagram is connected to a sensitive voltmeter with a centre zero. XY is then moved quickly once through the magnetic field.
N
SV
X
Y
movement
What is observed on the voltmeter?
A The needle moves briefly in one direction and then returns to the centre.
B The needle moves quickly in one direction and stays deflected.
C The needle vibrates rapidly from side to side whilst XY is moving.
D The needle stays still.
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© UCLES 2008 0625/01/M/J/08
35 The diagram shows a transformer connected to a 240 V a.c. supply.
primary coil60 turns secondary coil
30 turns
240 Va.c.
soft-iron core
What is the potential difference across the secondary coil of the transformer?
A 30 V B 120 V C 240 V D 480 V
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© UCLES 2008 0625/01/M/J/08 [Turn over
37 Diagram 1 shows a potential divider circuit containing two 100 Ω resistors.
One of the resistors is changed to 90 Ω, as shown in diagram 2.
100 Ω
100 Ω V
diagram 1
90 Ω
100 Ω V
diagram 2
How does the reading on the voltmeter change when this is done?
A It becomes zero.
B It decreases a little.
C It increases a little.
D It stays the same.
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0625/31/M/J/08© UCLES 2008
ForExaminer’s
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Extended -structured questions-35 marks
9 Fig. 9.1 shows apparatus used to investigate electromagnetic effects around straight
wires.
T1
T2
T3
T4
thin flexible wire thick rigidvertical wire
large circularhole in card
small circularhole in card
Fig. 9.1
Fig. 9.2 is a view looking down on the apparatus shown in Fig. 9.1.
Fig. 9.2
(a) A battery is connected to T1 and T2 so that there is a current vertically down the thickwire.
On Fig. 9.2, draw three magnetic field lines and indicate, with arrows, the direction of all three. [2]
(b) Using a variable resistor, the p.d. between terminals T1 and T2 is gradually reduced.
State the effect, if any, that this will have on
(i) the strength of the magnetic field, ...................................................................... [1]
(ii) the direction of the magnetic field. ...................................................................... [1]
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0625/31/M/J/08© UCLES 2008 [Turn over
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(c) The battery is now connected to terminals T3 and T4, as well as to terminals T1 and T2,so that there is a current down both wires. This causes the flexible wire to move.
(i) Explain why the flexible wire moves.
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
............................................................................................................................ [2]
(ii) State the direction of the movement of the flexible wire.
............................................................................................................................ [1]
(iii) The battery is replaced by one that delivers a smaller current.
State the effect that this will have on the force acting on the flexible wire.
..................................................................................................................................
............................................................................................................................ [1]
[Total: 8]
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0625/33/M/J/11© UCLES 2011
9 (a) Fig. 9.1 shows a wire, held between the poles of a magnet, carrying a current in the direction of the arrow.
current
S
N
Fig. 9.1
(i) On Fig. 9.1, draw an arrow, labelled F, to show the direction of the force acting on the wire. [1]
(ii) Explain why the force F acts on the wire.
...........................................................................................................................................
.......................................................................................................................................[1]
(iii) The directions of the current and the magnetic field are both reversed. State the effect on the force F.
...................................................................................................................................... [1]
(b) Fig. 9.2 shows a negatively charged particle travelling, in a vacuum, into a region where a magnetic field acts. The magnetic field, shown by the crosses, is acting into the paper.
– P
Fig. 9.2
(i) Draw an arrow, labelled F, to show the direction of the force on the particle at point P where it enters the field.
(ii) Describe the path of the particle as it continues to move through the magnetic field.
.......................................................................................................................................[2]
[Total: 5]
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0625/33/M/J/11© UCLES 2011 [Turn over
10 (a) In the space below, draw the symbol for an OR gate.
[1]
(b) Describe the action of an OR gate in terms of its inputs and outputs.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...............................................................................................................................................[2]
(c) A car manufacturer wishes to install an alarm system in a 2-door car to inform the driver if either door is not properly closed. An OR gate is to be used in the construction of this system.Describe suitable input and output arrangements for the gate.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...............................................................................................................................................[3]
[Total: 6]smart
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0625/33/M/J/12© UCLES 2012 [Turn over
ForExaminer’s
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9 40 lamps, each of resistance 8.0 Ω, are connected in series to a 240 V supply in order to decorate a tree.
(a) Calculate
(i) the current in each lamp,
current = ................................................. [2]
(ii) the power dissipated in each lamp.
power = ................................................. [2]
(b) The lamps are designed to “fail-short”. If a filament fails, the lamp shorts so that it has no resistance. The other lamps continue to light and the current increases.
The lamps are connected through a fuse that blows when the current rises above 0.9 A. At this current, the resistance of each lamp is 5% greater than its normal working resistance.
Calculate the maximum number of lamps that can fail before the fuse blows.
number of lamps = ................................................. [4]
[Total: 8]
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0625/33/M/J/12© UCLES 2012
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10 A student is designing a digital electronics circuit and needs to use the logic gate X shown in Fig. 10.1.
input A
input BX
output
Fig. 10.1
(a) Name the logic gate X. .................................. [1]
(b) Write down the values of the output when the inputs are
(i) input A low (logic 0), input B low (logic 0), output ..................................
(ii) input A low (logic 0), input B high (logic 1), output ..................................
(iii) input A high (logic 1), input B low (logic 0), output ..................................
(iv) input A high (logic 1), input B high (logic 1). output .................................. [2]
(c) When the student starts to build the circuit, he finds that the store room has run out of this type of logic gate. There is a supply of AND, OR and NOT gates. The student’s teacher explains that a combination of two of these gates may be used instead of logic gate X.
(i) State the two gates he should use to replace logic gate X.
.................................. and ..................................
(ii) Draw clearly in the space below these two logic gates, correctly connected, using standard symbols.
[3]
(d) Fig. 10.2 shows a block diagram, not using standard symbols, of a combination of gates.
ANDNOT
NOTU
W
Y Z
Fig. 10.2
State the logic levels of points Y and Z when the logic levels of points U and W are both 1.
logic level at point Y ......................................................
logic level at point Z ...................................................... [2]
[Total: 8]
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0625/61/O/N/13© UCLES 2013
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Alternative to practicals-9 marks
3 The IGCSE class is investigating the power of lamps in a circuit.
Fig. 3.1 shows the circuit used.
A
V
lamp 1P Q
lamp 2
powersupply
lamp 3
Fig. 3.1
(a) A student measures the potential difference V1 across lamp 1 and the current I in thecircuit. The meters are shown in Fig. 3.2.
0 101 9
2 83 74 65
V 0 1.0
0.2 0.80.4 0.6
A
Fig. 3.2
(i) Write down the readings shown on the meters in Fig. 3.2.
V1 = ......................................................
I = ......................................................
(ii) Calculate the power P1 of lamp 1 using the equation P1 = IV1.
P1 = ......................................................
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0625/61/O/N/13© UCLES 2013
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(iii) The student reconnects the voltmeter to measure the potential difference V2 acrosslamp 2 and then V3 across lamp 3.
Write down the readings shown on the meters in Figs. 3.3 and 3.4.
0 101 9
2 83 74 65
V 0 101 9
2 83 74 65
V
Fig. 3.3 Fig. 3.4
V2 = ..................................... V3 = .......................................
(iv) Calculate the power for each lamp using the equation P = IV.
P2 = ......................................................
P3 = ......................................................[3]
(v) Calculate the total power PT for the three lamps using the equation PT = P1 + P2 + P3.
PT = ................................................. [1]
(b) The student connects the voltmeter across the three lamps and records the potential difference. He calculates the power P.
1.61 WP = ......................................................
Another student suggests that PT should be equal to P.
State whether the results support this suggestion and justify your answer by reference to the results.
statement .........................................................................................................................
justification .......................................................................................................................
..........................................................................................................................................[2]
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0625/61/O/N/13© UCLES 2013
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(c) (i) Draw a circuit diagram, similar to that in Fig. 3.1, to show:
• a variable resistor in series with the power supply,• three lamps in parallel with each other between P and Q,• a voltmeter connected to measure the potential difference across the lamps.
Use standard symbols.
[2]
(ii) State the purpose of the variable resistor in this circuit.
..................................................................................................................................
.............................................................................................................................. [1]
[Total: 9]
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