KS3 Physics Quiz on 7J Electricity and magnetism practice questions

Which of the circuit symbols means a 'meter for measuring current'? [7j-1]
1. sym07
2. sym27
3. sym06
4. sym19
Which of the circuit symbols means a 'meter for measuring potential difference'? [7j-2]
1. sym07
2. sym27
3. sym06
4. sym19
Which of the circuit symbols means a 'light bulb or lamp'? [7j-3]
1. sym07
2. sym27
3. sym06
4. sym19
Which of the circuit symbols means 'two cells or batteries in series'? [7j-4]
1. sym10
2. sym14
3. sym18
4. sym11
Which of the circuit symbols means a 'switch 'on''? [7j-5]
1. sym08
2. sym09
3. sym18
4. sym10
Which of the circuit symbols means a 'switch 'off''? [7j-6]
1. sym08
2. sym09
3. sym18
4. sym10
Which of the circuit symbols means a 'switch closed'? [7j-7]
1. sym18
2. sym10
3. sym08
4. sym09
Which of the circuit symbols means a 'switch open'? [7j-8]
1. sym08
2. sym10
3. sym18
4. sym09
Which of the circuit symbols means a 'two way switch'? [7j-9]
1. sym14
2. sym18
3. sym29
4. sym02
Which of the circuit symbols means 'two cells or batteries in parallel'? [7j-10]
1. sym11
2. sym28
3. sym30
4. sym29
Which of the circuit symbols means 'two bulbs or lamps in series'? [7j-11]
1. sym11
2. sym28
3. sym30
4. sym29
Which of the circuit symbols means 'two bulbs or lamps in parallel'? [7j-12]
1. sym11
2. sym28
3. sym30
4. sym29
From the four circuits shown, 'in which two will the bulb/bulbs be the same brightness'? Note that the bulbs are identical and the batteries identical. [7j-13]
1. circuit 01 and circuit 05
2. circuit 01 and circuit 04
3. circuit 04 and circuit 05
4. circuit 05 and circuit 07
From the four circuits shown, 'in which will the bulb/bulbs be the dimmest'? Note that the bulbs are identical and the batteries identical. [7j-14]
1. circuit 01
2. circuit 04
3. circuit 05
4. circuit 07
From the four circuits shown, 'in which will the bulb or bulbs be the brightest'? Note that the bulbs are identical and the batteries identical. [7j-15]
1. circuit 01
2. circuit 04
3. circuit 07
4. circuit 05
From the four circuits shown, in which two 'will the lamps be the same brightness'? Note that the bulbs are identical and the batteries identical. [7j-16]
1. circuit 09 and circuit 16
2. circuit 07 and circuit 09
3. circuit 03 and circuit 07
4. circuit 03 and circuit 16
From the four circuits shown, which will have 'the brightest lit lamp or lamps'? Note that the bulbs are identical and the batteries identical. [7j-17]
1. circuit 07
2. circuit 09
3. circuit 03
4. circuit 16
From the four circuits shown, which will have 'the dimmest lit bulb or bulbs'? Note that the bulbs are identical and the batteries identical. [7j-18]
1. circuit 07
2. circuit 09
3. circuit 03
4. circuit 16
From the four circuits shown, in which two 'will the lamps be the same brightness'?
Note that the bulbs are identical and the batteries identical. [7j-19]
1. circuit 04 and circuit 06
2. circuit 06 and circuit 08
3. circuit 04 and circuit 17
4. circuit 08 and circuit 17
From the four circuits shown, which will have 'the brightest lit bulb or bulbs'? Note that the bulbs are identical and the batteries identical. [7j-20]
1. circuit 08
2. circuit 04
3. circuit 17
4. circuit 06
From the four circuits shown, which will have 'the dimmest lit bulb or bulbs'? Note that the bulbs are identical and the batteries identical. [7j-21]
1. circuit 08
2. circuit 04
3. circuit 17
4. circuit 06
In the context of electrical circuits, which words means 'does not readily allow the passage of electricity'? [7j-22]
1. insulator
2. conductor
3. voltmeter
4. ammeter
In the context of electrical circuits, which words means 'readily allows the passage of electricity'? [7j-23]
1. insulator
2. conductor
3. voltmeter
4. ammeter
In the context of electrical circuits, which words means an 'instrument that measures electrical force'? [7j-24]
1. insulator
2. conductor
3. voltmeter
4. ammeter
In the context of electrical circuits, which words means an 'instrument that measures electrical current'? [7j-25]
1. insulator
2. conductor
3. voltmeter
4. ammeter
In the context of electrical circuits, which of the following symbols means a 'variable resistor'? [7j-26]
1. sym21
2. sym05
3. sym04
4. sym13
In the context of electrical circuits, which of the following symbols means a 'fixed resistor'? [7j-27]
1. sym21
2. sym05
3. sym04
4. sym13
In the context of electrical circuits, which of the following symbols means a 'fuse'? [7j-28]
1. sym21
2. sym05
3. sym04
4. sym13
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-29]
1. in circuit 11 the bulbs are wired in parallel, but not so in circuit 12
2. if switch s2 is opened in both circuits, all the bulbs go out
3. the bulbs are dimmer in circuit 11 than the bulbs in circuit 12
4. the bulbs are brighter in circuit 12 than the bulbs in circuit 11
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-30]
1. if switch s2 is opened in both circuits, all the bulbs go out
2. in circuit 12 the bulbs are wired in series, but not in circuit 11
3. the bulbs are dimmer in circuit 11 than the bulbs in circuit 12
4. the bulbs are brighter in circuit 12 than the bulbs in circuit 11
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-31]
1. the bulbs in circuit 11 are wired in series
2. the bulbs in circuit 12 are wired in parallel
3. in circuit 11 the bulbs will be brighter than in circuit 12
4. the bulbs are dimmer in circuit 11 than the bulbs in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-32]
1. the bulbs in circuit 11 are wired in series
2. the bulbs in circuit 12 are wired in parallel
3. the bulbs are brighter in circuit 12 than the bulbs in circuit 11
4. in circuit 12 the bulbs will be dimmer than in circuit 11
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-33]
1. if switch s2 is opened in both circuits, all the bulbs go out in circuit 12 and only bulb b2 in circuit 11
2. if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
3. if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
4. if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-34]
1. if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
2. if switch s3 is opened in both circuits, all the bulbs go out in both circuits
3. if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
4. if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-35]
1. if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
2. if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
3. if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.2A in circuit 11 and ammeter a2 reads 0.4A in circuit 12
4. if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-36]
1. if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
2. if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
3. if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
4. if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.2A in circuit 11 and ammeter a1 reads 0.4A in circuit 12
Which of the following is a unit of electrical force shown on a battery? [7j-37]
1. volts
2. amps
3. joules
4. coulombs
Which of the following is a unit of current? [7j-38]
1. volts
2. amps
3. joules
4. coulomb
Which of the following is a unit of energy? [7j-39]
1. volts
2. amps
3. joules
4. coulomb
Which of the following is a unit of fuse rating? [7j-40]
1. volts
2. coulombs
3. joules
4. amps
Circuit 18 shows how three lamps and four ammeters are wired together. All the lamps are identical and all four switches are closed. If ammeter a4 reads 12A, what will be the current reading on ammeter a2? [7j-41]
1. 4A
2. 8A
3. 12A
4. 3A
Circuit 18 shows how three lamps and four ammeters are wired together. All the lamps are identical and all four switches are closed. If ammeter a1 reads 3A, what will be the current reading on ammeter a4? [7j-42]
1. 3A
2. 9A
3. 6A
4. 1A
Circuit 18 shows how three lamps and four ammeters are wired together. The lamps are NOT identical but all four switches are closed. If ammeter a4 reads 8A, a1 reads 3A and a2 reads 2A, what will be the current reading on ammeter a3? [7j-43]
1. 1A
2. 2A
3. 3A
4. 4A
Circuit 18 shows how three lamps and four ammeters are wired together. The lamps are NOT identical but all four switches are closed. If ammeter a1 reads 2A, a2 reads 1A and a3 reads 4A, what will be the current reading on ammeter a4? [7j-44]
1. 4A
2. 6A
3. 5A
4. 7A
Which statement about electricity and circuits is TRUE? [7j-45]
1. the conventional current flows from + to -
2. a circuit does not have to be complete for a current to flow
3. to be effective cells must be connected + to + and - to -
4. more bulbs wired in series decreases the total resistance
Which statement about electricity and circuits is TRUE? [7j-46]
1. the conventional current flows from + to +
2. the circuit must be complete for a current to flow
3. to be effective cells must be connected + to + and - to -
4. more bulbs wired in parallel increases the total resistance
Which statement about electricity and circuits is TRUE? [7j-47]
1. the conventional current flows from - to -
2. the circuit does not have to be complete for a current to flow
3. to be effective cells must be connected + to - and + to -
4. more bulbs wired in series decreases the total resistance
Which statement about electricity and circuits is TRUE? [7j-48]
1. the conventional current flows from - to +
2. the circuit does not have to be complete for a current to flow
3. to be effective cells must be connected + to + and - to -
4. more bulbs wired in series increases the total resistance
Which statement about electricity and circuits is TRUE? [7j-49]
1. a battery or cell is a supply of electrical energy
2. bulbs wired in parallel increase the total resistance
3. for a current to flow a switch must be open
4. in copper wire electrical current is a flow of positive protons
Which statement about electricity and circuits is TRUE? [7j-50]
1. a battery or cell is a supply of chemical energy
2. bulbs wired in parallel decrease the total resistance
3. for a current to flow a switch must be open
4. in copper wire electrical current is a flow of positive protons
Which statement about electricity and circuits is TRUE? [7j-51]
1. a battery or cell is a supply of heat energy
2. bulbs wired in parallel increase the total resistance
3. for a current to flow a switch must be closed
4. in copper wire electrical current is a flow of positive protons
Which statement about electricity and circuits is TRUE? [7j-52]
1. a battery or cell is a supply of kinetic energy
2. bulbs wired in parallel increase the total resistance
3. for a current to flow a switch must be open
4. in a copper wire an electrical current is a flow of negative electrons
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-53]
1. if the resistance is decreased, more current flows and the bulb is brighter
2. if the resistance is increased less current flows and the bulb cannot light up
3. if the cell or battery connections are swapped around, the bulb goes out
4. the variable resistor cannot be used to control the lamp brightness
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-54]
1. if the resistance is decreased, less current flows and the bulb is brighter
2. if the resistance is increased less current flows and the bulb is dimmer
3. if the cell or battery connections are swapped around, the bulb goes out
4. the variable resistor cannot be used to control the lamp brightness
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-55]
1. if the resistance is decreased, less current flows and the bulb is dimmer
2. if the resistance is increased more current flows and the bulb burns out
3. if the cell or battery connections are swapped around, the bulb still lights
4. the variable resistor cannot be used to control the lamp brightness
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-56]
1. if the resistance is decreased, less current flows and the bulb is brighter
2. if the resistance is increased more current flows and the bulb burns out
3. if the cell or battery connections are swapped around, the bulb goes out
4. the variable resistor can be used to control the lamp brightness
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switch s5 is closed? [7j-57]
1. b1 only
2. b1 and b6
3. b1, b2, b3 and b6
4. b1, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s3 and s5 are closed? [7j-58]
1. b1, b2 and b5
2. b1, b2, b3 and b6
3. b1, b2, b4 and b6
4. b1, b2, b4, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s2 and s5 are closed? [7j-59]
1. b1, b2, b5 and b6
2. b1, b2, b3 and b6
3. b1, b2, b4 and b6
4. b1, b2, b4, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s2, s4 and s5 are closed? [7j-60]
1. b1, b2, b5 and b6
2. b1, b2, b3 and b6
3. b1, b2, b4 and b6
4. b1, b2, b4, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s3, s4 and s5 are closed? [7j-61]
1. b1, b2, b3, b5 and b6
2. b1, b2, b3 and b6
3. b1, b2, b4 and b6
4. b1, b2, b4, b5 and b6
Circuit 21 shows the arrangement of six identical bulbs (X) and four ammeters (a1 to a4). To solve the problem you need to realise that each bulb has an identical resistance. The more bulbs there are in series, the greater the resistance to current flow. If a1 reads 3A and a4 reads 5.5A what will ammeter a2 read? [7j-62]
1. 1.0A
2. 1.5A
3. 2.0A
4. 0.5A
Circuit 21 shows the arrangement of six identical bulbs (X) and four ammeters (a1 to a4). To solve the problem you need to realise that each bulb has an identical resistance. The more bulbs there are in series, the greater the resistance to current flow. If a1 reads 6A and a2 reads 3A what will ammeter a4 read? [7j-63]
1. 12A
2. 10A
3. 11A
4. 9A
Circuit 21 shows the arrangement of six identical bulbs (X) and four ammeters (a1 to a4). To solve the problem you need to realise that each bulb has an identical resistance. The more bulbs there are in series, the greater the resistance to current flow. If a2 reads 4.5A and a3 reads 3.0A what will ammeter a1 read? [7j-64]
1. 6.0A
2. 7.5A
3. 1.5A
4. 9.0A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 1.5A? [7j-65]
1. 3A
2. 5A
3. 8A
4. 13A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 5A? [7j-66]
1. 3A
2. 8A
3. 5A
4. 13A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 8A? [7j-67]
1. 3A
2. 5A
3. 13A
4. 8A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 10A? [7j-68]
1. 3A
2. 5A
3. 8A
4. 13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 4A is passed through them? [7j-69]
1. 3A only
2. 3A and 5A only
3. 3A, 5A and 8A only
4. 3A, 5A, 8A and 13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 6A is passed through them? [7j-70]
1. 3A only
2. 3A and 5A only
3. 3A, 5A and 8A only
4. 3A, 5A, 8A and 13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 9A is passed through them? [7j-71]
1. 3A only
2. 3A and 5A only
3. 3A, 5A and 8A only
4. 3A, 5A, 8A and 13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 14A is passed through them? [7j-72]
1. 3A only
2. 3A and 5A only
3. 3A, 5A and 8A only
4. 3A, 5A, 8A and 13A
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is ON in Circuit 22? [7j-73]
1. s1a closed (up) and s2b open (up)
2. s1b open (up) and s2a open (down)
3. s1a open (down) and s2a closed (up)
4. s1b closed (down) and s2b open (up)
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is OFF in Circuit 22? [7j-74]
1. s1a closed (up) and s2b open (up)
2. s1b open (up) and s2a open (down)
3. s1b open (up) and s2a closed (up)
4. s1a open (down) and s2b closed (down)
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is OFF in Circuit 22? [7j-75]
1. s1b closed (down) and s2a open (down)
2. s1b open (up) and s2a closed (up)
3. s1a open (down) and s2a closed (up)
4. s1a open (down) and s2b closed (down)
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is ON in Circuit 22? [7j-76]
1. s1a closed (up) and s2a open (down)
2. s1a closed (up) and s2b closed (down)
3. s1a open (down) and s2a closed (up)
4. s1a open (down) and s2b closed (down)
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when only switch s1a is closed (up)? [7j-77]
1. b2 and b3
2. b1 and b4
3. b1, b2, b3 and b5
4. b1, b2, b4 and b5
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when only switch s1b is closed (down)? [7j-78]
1. b2 and b3
2. b1 and b4
3. b1, b2, b3 and b5
4. b1, b2, b4 and b5
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when switches s1a and s2 are closed? [7j-79]
1. b2 and b3
2. b1 and b4
3. b1, b2, b3 and b5
4. b1, b2, b4 and b5
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when switches s1b and s2 are closed? [7j-80]
1. b2 and b3
2. b1 and b4
3. b1, b2, b3 and b5
4. b1, b2, b4 and b5
Which statement is TRUE about mains electricity in the house? [7j-81]
1. the voltage is much bigger than a torch battery
2. wet skin has a bigger resistance than dry skin
3. the current flow is usually similar to triple batteries in a torch
4. a fuse allows a much higher than normal current to flow safely
Which statement is TRUE about mains electricity in the house? [7j-82]
1. the voltage is a little bigger than a torch battery
2. wet skin has a lower resistance than dry skin
3. the current flow is usually similar to triple batteries in a torch
4. a fuse allows a much higher than normal current to flow safely
Which statement is TRUE about mains electricity in the house? [7j-83]
1. the voltage is a little bigger than a torch battery
2. wet skin has a bigger resistance than dry skin
3. the current flow is usually big compared to a torch battery
4. a fuse allows a much higher than normal current to flow safely
Which statement is TRUE about mains electricity in the house? [7j-84]
1. the voltage is a little bigger than a torch battery
2. wet skin has a bigger resistance than dry skin
3. the current flow is usually similar to triple batteries in a torch
4. a fuse should melts if a significantly higher than normal current flows
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.6A? [7j-85]
1. circuit 03
2. circuit 04
3. circuit 07
4. circuit 08
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.15A? [7j-86]
1. circuit 03
2. circuit 04
3. circuit 07
4. circuit 08
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.9A? [7j-87]
1. circuit 03
2. circuit 04
3. circuit 07
4. circuit 08
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.1A? [7j-88]
1. circuit 03
2. circuit 04
3. circuit 07
4. circuit 08
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will bulbs b1 and b2 light up when the switch s is closed is closed? [7j-89]
1. circuit 24
2. circuit 25
3. circuit 26
4. circuit 27
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will only bulb b2 light up and only if switch s is closed? [7j-90]
1. circuit 24
2. circuit 25
3. circuit 26
4. circuit 27
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will only bulb b2 light up but does not need switch s to be closed? [7j-91]
1. circuit 24
2. circuit 25
3. circuit 26
4. circuit 27
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will only bulb b1 light up when the switch s is closed? [7j-92]
1. circuit 24
2. circuit 25
3. circuit 26
4. circuit 27
If bulb b1 'blows' what happens to the other bulbs? [7j-93]
1. b2, b3, b4, b5 and b6 all stay lit
2. b2 and b3 stay lit but b4, b5 and b6 also go out
3. b4, b5 and b6 stay lit, but b2 and b3 also go out
4. b2, b3, b4, b5 and b6 also go out
If bulb b2 'blows' what happens to the other bulbs? [7j-94]
1. b1, b3, b4, b5 and b6 stay lit
2. b1, b4, b5 and b6 stay lit, but b3 also goes out
3. b4, b5 and b6 stay lit, but b1 and b3 also go out
4. b1, b3, b4, b5 and b6 also go out
If bulb b5 'blows' what happens to the other bulbs? [7j-95]
1. b1, b2, b3, b4 and b6 stay lit
2. b1, b2, b3 and b6 stay lit, but b4 also goes out
3. b1, b2 and b3 stay lit but b4 and b6 also go out
4. b1, b2, b3, b4 and b6 also go out
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b2 'blows'? [7j-96]
1. b4 and b5 go out, b1, b3 and b6 stay lit
2. b1, b3 and b6 go out, b4 and b5 stay lit
3. b1, b5 and b6 stay lit, b3 and b4 go out
4. b1 still lit, b3, b4, b5 and b6 go out
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b3 'blows'? [7j-97]
1. b6 goes out, b1, b2, b4 and b5 stay lit
2. b2 and b6 go out, b1, b4 and b5 stay lit
3. b4 and b5 go out, b1, b2 and b6 stay lit
4. b2 goes out, b1, b4, b5 and b6 stay lit
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b4 'blows'? [7j-98]
1. b5 and b6 go out, b1, b2 and b3 stay lit
2. b5 goes out, b1, b2, b3 and b6 stay lit
3. b1 and b5 go out, b2, b3 and b6 stay lit
4. b3, b5 and b6 go out, b1 and b2 stay lit
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b5 'blows'? [7j-99]
1. b3 goes out, b1, b2, b4 and b6 stay lit
2. b2 and b4 go out, b1 and b6 stay lit
3. b4 goes out, b1, b2, b3 and b6 stay lit
4. b3 and b6 go out, b1, b2 and b4 stay lit
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b6 'blows'? [7j-100]
1. b4 goes out, b1, b2, b3 and b5 stay lit
2. b3 and b5 go out, b1, b2 and b4 stay lit
3. b4 and b5 go out, b1, b2 and b3 stay lit
4. b3 goes out, b1, b2, b4 and b5 stay lit
[7j-101] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). If a 2kW room heater was used for 2 hrs and 30 minutes, how many kWh units of electricity are used?
1. 5.0 kWh
2. 0.8 kWh
3. 1.25 kWh
4. 4.5 kWh
[7j-102] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). How many kWh of electrical energy is used if a 800W central heating pump is on for 12 hours?
1. 66.6 kWh
2. 9.6 kWh
3. 0.015 kWh
4. 1.5 kWh
[7j-103] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). How many kWh of electrical energy is used if a 3 kW oven is used for 1 hour and 45 minutes?
1. 2.0 kWh
2. 0.58 kWh
3. 5.25 kWh
4. 1.71 kWh
[7j-104] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). How many kWh of electrical energy is used if 200 W set of LED Christmas lights are on for 15 hours?
1. 13.3 kWh
2. 0.075 kWh
3. 3000 kWh
4. 3.0 kWh
[7j-105] How much electrical energy is transferred to water when a 2 kW kettle takes 40 seconds to boil?
1. 80 kJ
2. 8000 J
3. 50 J
4. 5 kJ
[7j-106] How much electrical energy is transferred when a 30 W torch is used for 5 minutes?
1. 6 J
2. 9000 J
3. 0.9 kJ
4. 150 J
[7j-107] How much electrical energy is transferred when a 60 W laptop computer is used for 45 minutes?
1. 1.75 kJ
2. 2.7 kJ
3. 162 kJ
4. 0.75 kJ
[7j-108] How much electrical energy is transferred when four 20 W light bulbs are on for 30 minutes?
1. 600 J
2. 6 kJ
3. 14 400 J
4. 144 kJ
[7j-109] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
1. An electrical conductor is a material that allows current to flow through it relatively easily and has a high resistance.
2. An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
3. An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
4. An electrical current is the movement of charge (eg negative electrons) through a conducting material.
5. Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-110] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
1. An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
2. An electrical insulator is a material that does not readily allow current to flow through it and has a low resistance.
3. An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
4. An electrical current is the movement of charge (eg negative electrons) through a conducting material.
5. Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-111] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
1. An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
2. An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
3. An electric resistor inhibits current (charge) flow and always causes the transfer of useful energy to the surroundings.
4. An electrical current is the movement of charge (eg negative electrons) through a conducting material.
5. Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-112] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
1. An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
2. An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
3. An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
4. An electrical current is the movement of positive ions through a metal conductor.
5. Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-113] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
1. An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
2. An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
3. An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
4. An electrical current is the movement of charge (eg negative electrons) through a conducting material.
5. Electrical power of an appliance is the rate at which useful energy is transferred by some device.
[7j-114] Which is the unit symbol for electrical resistance?
1. Ω
2. V
3. A
4. J
5. W
[7j-115] Which is the unit symbol for potential difference?
1. Ω
2. V
3. A
4. J
5. W
[7j-116] Which is the unit symbol for electrical current?
1. Ω
2. V
3. A
4. J
5. W
[7j-117] Which is the unit symbol for energy transferred?
1. Ω
2. V
3. A
4. J
5. W
[7j-118] Which is the unit symbol for the power of a device?
1. Ω
2. V
3. A
4. J
5. W
[7j-119] Which of the following is NOT true about electricity?
1. Electrical charge flows from the positive terminal of a battery to the negative terminal of a battery.
2. The convention current flows from the positive terminal of a battery to the negative terminal of a battery.
3. In a metal wire it is electrons that carry the negative electrical charge and energy.
4. The battery is the driving force in a circuit and its voltage (p.d.) is a measure of the energy per unit charge transferred by the current.
[7j-119] Which of the following is NOT true about electricity?
1. Electrical charge flows from the negative terminal of a battery to the positive terminal of a battery.
2. The convention current flows from the negative terminal of a battery to the positive terminal of a battery.
3. In a metal wire it is electrons that carry the negative electrical charge and energy.
4. The battery is the driving force in a circuit and its voltage (p.d.) is a measure of the energy per unit charge transferred by the current.
[7j-121] Which of the following is NOT true about electricity?
1. Electrical charge flows from the negative terminal of a battery to the positive terminal of a battery.
2. The convention current flows from the positive terminal of a battery to the negative terminal of a battery.
3. In a metal wire it is positive ions that carry the negative electrical charge and energy.
4. The battery is the driving force in a circuit and its voltage (p.d.) is a measure of the energy per unit charge transferred by the current.
[7j-122] Which of the following is NOT completely true about electricity?
1. Electrical charge flows from the negative terminal of a battery to the positive terminal of a battery.
2. The convention current flows from the positive terminal of a battery to the negative terminal of a battery.
3. In a metal wire it is electrons that carry the negative electrical charge and energy.
4. The resistors are the driving force in a circuit and the voltage (p.d.) across them is a measure of the energy per unit charge transferred by the current.
[7j-123] Which is NOT true concerning static electricity?
1. Static electricity is only created when an object loses electrons.
2. If an object gains electrons it becomes negatively charged.
3. If an object loses electrons it becomes positively charged.
4. If an object with a negative charge is brought near an object with a positive charge, they attract each other.
[7j-124] Which is NOT true concerning static electricity?
1. Static electricity is created when an object loses or gains electrons.
2. If an object gains electrons it becomes positively charged.
3. Objects with unlike static charges, attract each other.
4. If an object with a negative charge is brought near an object with a positive charge, they attract each other.
[7j-125] Which is NOT true concerning static electricity?
1. Static electricity is created when an object loses or gains electrons.
2. Objects with unlike static charges, attract each other.
3. If an object loses electrons it becomes negatively charged.
4. If an object with a negative charge is brought near an object with a positive charge, they attract each other.
[7j-126] Which is NOT true concerning static electricity?
1. Static electricity is created when an object loses or gains electrons.
2. If an object gains electrons it becomes negatively charged.
3. If an object loses electrons it becomes positively charged.
4. If an object with a negative charge is brought near an object with a positive charge, they repel each other.
[7j-127] If the p.d. across a resistor is 15.0 V, what is its resistance if the current flowing through it is 3.0 A?
1. 5.0 Ω
2. 45.0 Ω
3. 0.2 Ω
4. 18.0 Ω
[7j-128] If the p.d. across a resistor is 220 V, what is its resistance if the current flowing through it is 5.0 A?
1. 44 Ω
2. 1100 Ω
3. 0.023 Ω
4. 225 Ω
[7j-129] If the p.d. across a bulb filament is 4.5 V, what is the bulb's resistance if the current flowing through it is 0.5 A?
1. 9.0 Ω
2. 2.25 Ω
3. 0.11 Ω
4. 5.0 Ω
[7j-130] If the p.d. across a resistor is 240 V, what is its resistance if the current flowing through it is 8.0 A?
1. 30 Ω
2. 1920 Ω
3. 0.033 Ω
4. 248 Ω
[7j-131] What is the p.d. across a resistor of 11 Ω if the current flowing through it is 20 A?
1. 0.55 V
2. 220 V
3. 1.82 V
4. 31 V
[7j-132] What is the p.d. across a resistor of 3.0 Ω if the current flowing through it is 1.5 A?
1. 1.5 V
2. 4.5 V
3. 0.17 V
4. 3.5 V
[7j-133] What is the p.d. across a resistor of 30 Ω if the current flowing through it is 8.0 A?
1. 3.75 V
2. 240 V
3. 0.27 V
4. 38 V
[7j-134] What is the p.d. across a resistor of 4.0 Ω if the current flowing through it is 3.0 A?
1. 0.75 V
2. 12.0 V
3. 1.33 V
4. 7.0 V
[7j-135] What is the current flowing through a resistor of 7.5 Ω if the p.d. across it is 1.5 V?
1. 11.25 A
2. 5.0 A
3. 0.20 A
4. 10.0 A
[7j-136] What is the current flowing through a resistor of 55 Ω if the p.d. across it is 220 V?
1. 11.25 A
2. 5.0 A
3. 4.0 A
4. 10.0 A
[7j-137] What is the current flowing through a resistor of 8.0 Ω if the p.d. across it is 12.0 V?
1. 0.67 A
2. 0.66 A
3. 1.5 A
4. 20.0 A
[7j-138] What is the current flowing through a resistor of 50 Ω if the p.d. across it is 240 V?
1. 0.21 A
2. 1.2 A
3. 4.8 A
4. 290 A
[7j-139] What is the power of a device if the current flowing through it is 0.2 A and the p.d. across it is 1.5 V?
1. 0.13 W
2. 7.5 W
3. 1.70 W
4. 0.30 W
[7j-140] What is the power of a device if the current flowing through it is 8.0 A and the p.d. across it is 250 V?
1. 31 W
2. 0.032 kW
3. 3100 W
4. 2.0 kW
[7j-141] What is the power of a device if the current flowing through it is 3.6 A and the p.d. across it is 220 V?
1. 0.016 kW
2. 61 W
3. 1.58 kW
4. 792 W
[7j-142] What is the power of a device if the current flowing through it is 12.0 A and the p.d. across it is 250 V?
1. 0.048 kW
2. 20.8 W
3. 2080 W
4. 3.0 kW
[7j-143] What is the current flowing through a device operating with a p.d. of 240 V and a power rating of 1200 W?
1. 0.2 A
2. 3.6 A
3. 288 A
4. 5.0 A
[7j-144] What is the current flowing through a device operating with a p.d. of 240 V and a power rating of 60 W?
1. 4.0 A
2. 2.5 A
3. 40 A
4. 0.25 A
[7j-145] What is the current flowing through a device operating with a p.d. of 220 V and a power rating of 700 W?
1. 2.92 A
2. 1.54 A
3. 30.3 A
4. 3.18 A
[7j-146] What is the current flowing through a device operating with a p.d. of 240 V and a power rating of 2.5 kW?
1. 96 A
2. 60 A
3. 60 A
4. 10.4 A
[7j-147] What is the p.d. across a device operating with a current of 0.20 A and a power rating of 0.90 W?
1. 1.8 V
2. 0.22 V
3. 4.5 V
4. 0.45 V
[7j-148] What is the p.d. across a device operating with a current of 8.0 A and a power rating of 1.92 kW?
1. 15.4 V
2. 4.16 V
3. 240 V
4. 150 V
[7j-149] What is the p.d. across a device operating with a current of 5.0 A and a power rating of 60 W?
1. 65 V
2. 0.083 V
3. 12 V
4. 30 V
[7j-150] What is the p.d. across a device operating with a current of 5.0 A and a power rating of 1.1 kW?
1. 5.50 V
2. 4.54 V
3. 220 V
4. 30.0 V
[7j-151] Which is NOT completely true about magnetism?
1. When a current flows through a wire, there may be magnetic field is created around it.
2. The field lines of magnetic flux are considered to flow from the north pole to the south pole of a magnet.
3. An electric motor works by the interaction of two separate, but adjacent, magnetic fields.
4. A solenoid consists of many coils of wire arranged to create a more concentrated stronger magnetic field.
[7j-152] Which is NOT true about magnetism?
1. When a current flows through a wire, a magnetic field is created around it.
2. The field lines of magnetic flux are considered to flow from the south pole to the north pole of a magnet.
3. An electric motor works by the interaction of two separate, but adjacent, magnetic fields.
4. A solenoid consists of many coils of wire arranged to create a more concentrated stronger magnetic field.
[7j-153] Which is NOT true about magnetism?
1. When a current flows through a wire, a magnetic field is created around it.
2. The field lines of magnetic flux are considered to flow from the north pole to the south pole of a magnet.
3. An electric motor works by the interaction of an electric field and a magnetic field.
4. A solenoid consists of many coils of wire arranged to create a more concentrated stronger magnetic field.
[7j-154] Which is NOT completely true about magnetism?
1. When a current flows through a wire, a magnetic field is created around it.
2. The field lines of magnetic flux are considered to flow from the north pole to the south pole of a magnet.
3. An electric motor works by the interaction of two separate, but adjacent, magnetic fields.
4. A solenoid consists of parallel strands of wire arranged to create a magnetic field.
[7j-155] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
1. decreasing the current
2. increase the number of coils
3. placing an iron rod inside the coil
4. packing the coils closer together
[7j-156] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
1. increasing the current
2. decrease the number of coils
3. placing an iron rod inside the coil
4. packing the coils closer together
[7j-157] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
1. increasing the current
2. increase the number of coils
3. placing an copper rod inside the coil
4. packing the coils closer together
[7j-158] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
1. increasing the current
2. increase the number of coils
3. placing an iron rod inside the coil
4. packing the coils further apart.
[7j-159] The compass needle points 'north' when no current flows through the solenoid coil containing a iron rod. When the current is switched on, in which direction will the compass needle point?
[7j-160] The compass needle points 'north' when no current flows through the solenoid coil containing a iron rod. When the current is switched on, in which direction will the compass needle point?
[7j-161] The diagram shows the direction the compass needle points when the current is flowing through the solenoid coil. If the terminals of the battery are swapped around, in which direction will the compass needle point?
[7j-162] The diagram shows the direction the compass needle points when the current is flowing through the solenoid coil. If the terminals of the battery are swapped around, in which direction will the compass needle point?
[7j-163] Which is NOT completely true about the Earth's magnetic field?
1. The geographic north pole of the Earth is the north pole of the Earth's magnetic field.
2. The Earth's magnetic field is caused by the core, composed mainly of an iron and nickel mixture.
3. The magnetic north pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
4. A compass needle aligns itself along the field lines of the Earth's magnetic field from north to south.
[7j-164] Which is NOT completely true about the Earth's magnetic field?
1. The geographic north pole of the Earth is the south pole of the Earth's magnetic field.
2. The Earth's magnetic field is caused by the core, composed mainly of an iron and copper mixture.
3. The magnetic north pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
4. A compass needle aligns itself along the field lines of the Earth's magnetic field from north to south.
[7j-165] Which is NOT completely true about the Earth's magnetic field?
1. The geographic north pole of the Earth is the south pole of the Earth's magnetic field.
2. The Earth's magnetic field is caused by the core, composed mainly of an iron and nickel mixture.
3. The magnetic south pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
4. A compass needle aligns itself along the field lines of the Earth's magnetic field from north to south.
[7j-166] Which is NOT completely true about the Earth's magnetic field?
1. The geographic north pole of the Earth is the south pole of the Earth's magnetic field.
2. The Earth's magnetic field is caused by the core, composed mainly of an iron and nickel mixture.
3. The magnetic north pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
4. A compass needle aligns itself along the field lines of the Earth's magnetic field from south to north.
[7j-167] How much energy is transferred if a 50 W powered radio is used for 5 minutes?
1. 10 J
2. 25 kJ
3. 250 J
4. 15 kJ
[7j-168] How much energy is transferred if a 500 W powered kettle is used for 2 minutes?
1. 6000 J
2. 250 J
3. 3000 J
4. 60 kJ
[7j-169]
Which is NOT correct concerning circuit 49?
1. The bulb and ammeter A₁ are wired in parallel.
2. The bulb and resistor are wired in parallel.
3. The resistor and ammeter A₂ are wired in series.
4. The p.d. (V) is the same across both the bulb (V₁) and the resistor (V₂).
[7j-170]
Which is NOT correct concerning circuit 49?
1. The bulb and ammeter A₁ are wired in series.
2. The bulb and resistor are wired in series.
3. The resistor and ammeter A₂ are wired in series.
4. The p.d. (V) is the same across both the bulb (V₁) and the resistor (V₂).
[7j-171]
Which is NOT correct concerning circuit 49?
1. The bulb and ammeter A₁ are wired in series.
2. The bulb and resistor are wired in parallel.
3. The resistor and ammeter A₂ are wired in parallel.
4. The p.d. (V) is the same across both the bulb (V₁) and the resistor (V₂).
[7j-172]
Which is NOT correct concerning circuit 49?
1. The bulb and ammeter A₁ are wired in series.
2. The bulb and resistor are wired in parallel.
3. The resistor and ammeter A₂ are wired in series.
4. The potential differences across both the bulb (V₁) and the resistor (V₂) are different.
[7j-173]
Which is NOT correct concerning circuit 50?
1. The bulb b2 and ammeter A₂ are wired in parallel.
2. The two bulbs are wired in parallel.
3. The bulb b2 and voltmeter V₂ are wired in parallel.
4. The p.d. (V) across both bulbs is the same.
[7j-174]
Which is NOT correct concerning circuit 50?
1. The bulb b2 and ammeter A₂ are wired in series.
2. The two bulbs are wired in series.
3. The bulb b2 and voltmeter V₂ are wired in parallel.
4. The p.d. (V) across both bulbs is the same.
[7j-175]
Which is NOT correct concerning circuit 50?
1. The bulb b2 and ammeter A₂ are wired in series.
2. The two bulbs are wired in parallel.
3. The bulb b2 and voltmeter V₂ are wired in series.
4. The p.d. (V) across both bulbs is the same.
[7j-176]
Which is NOT correct concerning circuit 50?
1. The bulb b2 and ammeter A₂ are wired in series.
2. The two bulbs are wired in parallel.
3. The bulb b2 and voltmeter V₂ are wired in parallel.
4. The p.d. (V) across the two bulbs is not the same.
[7j-177]
In circuit 49, if ammeter A₁ reads 0.85 A and ammeter A₃ reads 1.50 A, what will ammeter A₂ read?
1. 0.65 A
2. 0.75 A
3. 2.35 A
4. 0.85 A
[7j-178]
In circuit 49, if ammeter A2 reads 0.75 A and ammeter A₄ reads 2.85 A, what will ammeter A₁ read?
1. 2.10 A
2. 0.75 A
3. 3.60 A
4. 1.10 A
[7j-179]
In circuit 49, if ammeter A₁ reads 1.75 A and ammeter A₂ reads 2.45 A, what will ammeter A_{3 read?}
1. 4.20 A
2. 0.70 A
3. 1.30 A
4. 1.10 A
[7j-180]
In circuit 49, if ammeter A₁ reads 2.80 A and ammeter A₂ reads 1.45 A, what will ammeter A_{4 read?}
1. 4.25 A
2. 2.13 A
3. 1.35 A
4. 2.90 A
[7j-181]
In circuit 50, if ammeter A₁ reads 0.66 A, what will ammeter A₂ most likely read?
1. 0.33 A
2. 1.95 A
3. 1.98 A
4. 0.66 A
[7j-182]
In circuit 50, if ammeter A₂ reads 1.46 A, what will ammeter A₃ most likely read?
1. 0.73 A
2. 7.30 A
3. 1.46 A
4. 2.92 A
[7j-183]
In circuit 51, assuming the bulbs are identical, if voltmeter V₁ reads 1.5 V, what will voltmeter V₃ read?
1. 4.5 V
2. 3.0 V
3. 1.5 V
4. 0.5 V
[7j-184]
In circuit 51, assuming the bulbs are identical, if voltmeter V₂ reads 1.5 V, what will voltmeter V₃ read?
1. 4.5 V
2. 3.0 V
3. 1.5 V
4. 0.5 V
[7j-185]
In circuit 51, assuming the bulbs are identical, if voltmeter V₂ reads 1.5 V, what will voltmeter V₄ read?
1. 1.5 V
2. 3.0 V
3. 4.5 V
4. 0.5 V
[7j-186]
In circuit 51, assuming the bulbs are identical, if ammeter A₂ reads 1.5 A, what will ammeter A₁ read?
1. 0.5 A
2. 4.5 A
3. 1.5 A
4. 3.0 A
[7j-187]
In circuit 51, assuming the bulbs are identical, if ammeter A₁ reads 1.5 A, what will ammeter A₃ read?
1. 0.5 A
2. 4.5 A
3. 1.5 A
4. 3.0 A
[7j-188]
In circuit 51, assuming the bulbs are identical, if ammeter A₂ reads 1.5 A, what will ammeter A₃ read?
1. 0.5 A
2. 4.5 A
3. 1.5 A
4. 3.0 A
[7j-189] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
1. When the switch (1) is closed the solenoid coil (2) creates a permanent magnetic field.
2. The input (primary circuit) can be operated with a low voltage-current to switch on the a device (5) which can be a high voltage-current powerful electric motor.
3. The solenoid coil (2) and soft iron core act as a temporary magnet.
4. The solenoid coil (2) attracts the pivoted L piece (3) which closes the switch contacts (4) to operate the electric motor (5).
[7j-190] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
1. When the switch (1) is closed the solenoid coil (2) creates a temporary magnetic field.
2. The input (primary circuit) must be operated with a high voltage-current value to switch on a powerful device (5) like a powerful electric motor.
3. The solenoid coil (2) and soft iron core act as a temporary magnet.
4. The solenoid coil (2) attracts the pivoted L piece (3) which closes the switch contacts (4) to operate the electric motor (5).
[7j-191] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
1. When the switch (1) is closed the solenoid coil (2) creates a temporary magnetic field.
2. The input (primary circuit) can be operated with a low voltage-current to switch on the a device (5) which can be a high voltage-current powerful electric motor.
3. The solenoid coil (2) and soft iron core act as a permanent magnet.
4. The solenoid coil (2) attracts the pivoted L piece (3) which closes the switch contacts (4) to operate the electric motor (5).
[7j-192] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
1. When the switch (1) is closed the solenoid coil (2) creates a temporary magnetic field.
2. The input (primary circuit) can be operated with a low voltage-current to switch on the a device (5) which can be a high voltage-current powerful electric motor.
3. The solenoid coil (2) and soft iron core act as a temporary magnet.
4. The solenoid coil (2) repels the pivoted L piece (3) to close the switch contacts (4) to operate the electric motor (5).
[7j-193] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
1. When the bell push switch is closed the two solenoid coils create a permanent magnetic field.
2. The striker-armature is attracted to hit the bell by the magnetic field of the solenoid coils.
3. When the striker hits the bell, the circuit is broken removing the magnetic field and the striker springs back to its original position.
4. The core of the solenoid coils and the armature must be made of soft iron so they can only act as a temporary magnet.
[7j-194] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
1. When the bell push switch is closed the two solenoid coils create a temporary magnetic field.
2. The striker-armature is attracted to hit the bell by the electric field of the solenoid coils.
3. When the striker hits the bell, the circuit is broken removing the magnetic field and the striker springs back to its original position.
4. The core of the solenoid coils and the armature must be made of soft iron so they can only act as a temporary magnet.
[7j-195] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
1. When the bell push switch is closed the two solenoid coils create a temporary magnetic field.
2. The striker-armature is attracted to hit the bell by the magnetic field of the solenoid coils.
3. When the striker hits the bell, the circuit is completed creating the magnetic field and the striker springs back to its original position.
4. The core of the solenoid coils and the armature must be made of soft iron so they can only act as a temporary magnet.
[7j-196] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
1. When the bell push switch is closed the two solenoid coils create a temporary magnetic field.
2. The striker-armature is attracted to hit the bell by the magnetic field of the solenoid coils.
3. When the striker hits the bell, the circuit is broken removing the magnetic field and the striker springs back to its original position.
4. The core of the solenoid coils and the armature must be made of soft iron so they can only act as a permanent magnet.
[7j-197] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
1. The loudspeaker works on the interaction between a permanent magnetic field (solenoid coil) and a temporary magnetic field (E shaped magnet).
2. The solenoid coil attached to the cone creates a temporary and varying magnetic field when the current flows through it.
3. The variation of the solenoid magnetic field produces the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
4. The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the magnetic field of the solenoid coil.
[7j-198] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
1. The loudspeaker works on the interaction between a temporary magnetic field (solenoid coil) and a permanent magnetic field (E shaped magnet).
2. The solenoid coil attached to the cone creates a permanent and constant magnetic field when the current flows through it.
3. The variation of the solenoid magnetic field produces the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
4. The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the magnetic field of the solenoid coil.
[7j-199] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
1. The loudspeaker works on the interaction between a temporary magnetic field (solenoid coil) and a permanent magnetic field (E shaped magnet).
2. The solenoid coil attached to the cone creates a temporary and varying magnetic field when the current flows through it.
3. The variation of the magnetic field of the permanent magnet E creates the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
4. The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the magnetic field of the solenoid coil.
[7j-200] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
1. The loudspeaker works on the interaction between a temporary magnetic field (solenoid coil) and a permanent magnetic field (E shaped magnet).
2. The solenoid coil attached to the cone creates a temporary and varying magnetic field when the current flows through it.
3. The variation of the solenoid magnetic field produces the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
4. The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the permanent magnetic field of the solenoid coil.
[7j-201] Which of the following statements is incorrect about static electricity?
1. Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field throughout the materials.
2. Electrons are tiny particles that carry a negative electric charge.
3. Weakly conducting materials are added to polymer materials to prevent rapid unwanted discharge of static electricity e.g. sparks.
4. When two electrically statically charged objects are brought together they attract or repel each other.
[7j-202] Which of the following statements is incorrect about static electricity?
1. Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field on the surface of the materials.
2. Electrons are tiny particles that carry a positive electric charge.
3. Weakly conducting materials are added to polymer materials to prevent rapid unwanted discharge of static electricity e.g. sparks.
4. When two electrically statically charged objects are brought together they attract or repel each other.
[7j-203] Which of the following statements is incorrect about static electricity?
1. Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field on the surface of the materials.
2. Electrons are tiny particles that carry a negative electric charge.
3. Weakly conducting materials are added to polymer materials to store unwanted static electricity.
4. When two electrically statically charged objects are brought together they attract or repel each other.
[7j-204] Which of the following statements is incorrect about static electricity?
1. Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field on the surface of the materials.
2. Electrons are tiny particles that carry a negative electric charge.
3. Weakly conducting materials are added to polymer materials to prevent rapid unwanted discharge of static electricity e.g. sparks.
4. When two electrically statically charged objects are brought together they always attract each other.
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-53]
1. burn fuel
2. heat water
3. move turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-54]
1. burn fuel
2. heat water
3. move turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-55]
1. burn fuel
2. heat water
3. move turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-56]
1. burn fuel
2. heat water
3. move turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-57]
1. solar radiation
2. air movement
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-58]
1. solar radiation
2. air movement
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-59]
1. solar radiation
2. air movement
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-60]
1. solar radiation
2. air movement
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-61]
1. rain water and dam
2. flowing water
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-62]
1. rain water and dam
2. flowing water
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-63]
1. rain water and dam
2. flowing water
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-64]
1. rain water and dam
2. flowing water
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-65]
1. hot volcanic rocks
2. making steam flow fast
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-66]
1. hot volcanic rocks
2. making steam flow fast
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-67]
1. hot volcanic rocks
2. making steam flow fast
3. rotating turbine
4. turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-68]
1. hot volcanic rocks
2. making steam flow fast
3. rotating turbine
4. turn generator
Which description matches a solar cell? [7i-69]
1. electrical energy directly from sunlight
2. water stored behind a dam
3. air flow driven by the sun
4. mainly due to the movement of the moon
Which description matches hydroelectric power? [7i-70]
1. electrical energy directly from sunlight
2. water stored behind a dam
3. air flow driven by the sun
4. mainly due to the movement of the moon
[7i-118] A polythene rod is rubbed with a cloth. What sort of energy store is created?
1. electrostatic energy store
2. magnetic energy store
3. kinetic energy store
4. chemical energy store
[7i-119] An night storage heater is uses cheaper off-peak electricity. What sort of energy store is created?
1. electrostatic energy store
2. thermal energy store
3. electrical energy store
4. chemical energy store
[7i-120] A mobile phone battery is charged up. What sort of energy store is created?
1. electrostatic energy store
2. thermal energy store
3. electrical energy store
4. chemical energy store
Which form of energy is carried by a current of moving charge? [9i-16]
1. nuclear
2. elastic/strain potential
3. kinetic
4. electrical
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-19] What is the cost of using a 1.5kW heater for 2 hours if the cost of electricity is 7p/unit?
1. 10.5p
2. 3.5p
3. 21.0p
4. 7.0p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-20] What is the cost of using a 3 kW heater for 6 hours if the cost of electricity is 6p/unit?
1. 54p
2. £2.16
3. 36p
4. £1.08
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-21] What is the cost of using a 60W light bulb for 20 hours if the cost of electricity is 5p/unit?
1. 6p
2. £6.00
3. £1.20
4. 60p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-22] What is the cost of using a 700W iron for 2.5 hours if the cost of electricity is 8p/unit?
1. 7.0p
2. 14p
3. 160p
4. 3p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-23] What is the cost of using a 200W hair dryer for 10 minutes if the cost of electricity is 6p/unit?
1. 2p
2. 1.2p
3. 0.2p
4. 12p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-24] What is the cost of using a 4kW oven for 5 hours if the cost of electricity is 7p/unit?
1. £0.70
2. 20p
3. 35p
4. £1.40
What is the overall energy change using a loudspeaker? [9i-25]
1. electrical to sound
2. sound to electrical
3. chemical to kinetic
4. light to electrical
What is the overall energy change using a microphone? [9i-26]
1. electrical to sound
2. sound to electrical
3. chemical to kinetic
4. light to electrical
What is the overall energy change using a solar cell? [9i-28]
1. electrical to sound
2. sound to electrical
3. chemical to kinetic
4. light to electrical
What are the energy changes for using a diesel generator to operate an electrical appliance? [9i-30]
1. electrical => kinetic => gravitational potential energies
2. chemical => thermal (heat) => kinetic => electrical => heat/thermal energies
3. chemical => kinetic => thermal => electrical
4. chemical => kinetic => elastic potential energies
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true?
Examples:
(1) A lamp coverts 5% of the energy into light.
(2) A kettle uses 97% of the energy to heat the water.
(3) A typical food mixer wastes 60% of the energy input.
(4) A HiFi system converts 30% of the energy into sound and light. [9i-52]
1. 95% of the electrical energy is wasted as heat by the lamp by conduction and radiation
2. the electric kettle is the most energy efficient appliance with least wasted energy
3. the food mixer converts 40% of the electrical energy into useful kinetic energy
4. The HiFi wastes 50% of the electrical energy, mainly as heat or thermal energy
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true?
Examples:
(1) A lamp coverts 5% of the energy into light.
(2) A kettle uses 97% of the energy to heat the water.
(3) A typical food mixer wastes 60% of the energy input.
(4) A HiFi system converts 30% of the energy into sound and light. [9i-53]
1. the lamp is the most efficient appliance with the least wasted energy
2. 3% of the electrical energy is wasted by the kettle, mainly by conduction and convection losses
3. the food mixer converts about 60% of the electrical energy into heat and sound energy
4. The HiFi produces sound energy that is not wasted
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true?
Examples:
(1) A lamp coverts 5% of the energy into light.
(2) A kettle uses 97% of the energy to heat the water.
(3) A typical food mixer wastes 60% of the energy input.
(4) A HiFi system converts 30% of the energy into sound and light. [9i-54]
1. the lamp is the least efficient appliance with the most wasted energy
2. 3% of the electrical energy is wasted by the kettle, mainly by leaked conduction of electrical charge or current
3. the food mixer converts about 60% of the electrical energy into heat and sound energy
4. The HiFi produces sound energy that is not wasted
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true?
Examples:
(1) A lamp coverts 5% of the energy into light.
(2) A kettle uses 97% of the energy to heat the water.
(3) A typical food mixer wastes 60% of the energy input.
(4) A HiFi system converts 30% of the energy into sound and light. [9i-55]
1. the lamp is the least efficient appliance with the most wasted energy
2. 3% of the electrical energy is wasted by the kettle, mainly by conduction and convection losses
3. the food mixer converts about 40% of the electrical energy into useful heat and sound energy
4. The HiFi produces sound energy that is not wasted
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true?
Examples:
(1) A lamp coverts 5% of the energy into light.
(2) A kettle uses 97% of the energy to heat the water.
(3) A typical food mixer wastes 60% of the energy input.
(4) A HiFi system converts 30% of the energy into sound and light. [9i-56]
1. the lamp is the least efficient appliance with the most wasted energy
2. 3% of the electrical energy is wasted by the kettle, mainly by conduction and convection losses
3. the food mixer converts about 60% of the electrical energy into heat and sound energy
4. The HiFi produces sound energy that is wasted
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to listening to recorded message? [9i-57]
1. chemical => electrical => sound
2. electrical => chemical
3. chemical => electrical => light
4. light => electrical => sound
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to charging the battery? [9i-58]
1. chemical => electrical => sound
2. electrical => chemical
3. chemical => electrical => light
4. light => electrical
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to receiving a text message? [9i-59]
1. chemical => electrical => sound
2. electrical => chemical => light
3. chemical => electrical => light
4. light => electrical
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to recording pictures to transmit? [9i-60]
1. chemical => electrical => sound
2. electrical => chemical
3. chemical => electrical => light
4. light => electrical
Various sorts of energy resources can be used to produce electricity for use in the home. Which type of energy resource produces electrical energy from a torch battery? [9i-69]
1. chemical energy
2. sunlight energy
3. kinetic energy
4. heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity in a calculator solar cell? [9i-70]
1. chemical energy
2. sunlight energy
3. kinetic energy
4. heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity using a wind turbine? [9i-71]
1. chemical energy
2. geothermal energy
3. kinetic energy
4. gravitational potential energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity in a geothermal power station? [9i-72]
1. chemical energy
2. sunlight energy
3. gravitational potential energy
4. heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity from a diesel/petrol generator? [9i-73]
1. chemical energy
2. sunlight energy
3. kinetic energy
4. gravitational potential energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity from a mountain stream turbine generator? [9i-74]
1. chemical energy
2. gravitational potential energy
3. solar radiation energy
4. heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity from a river paddle wheel generator? [9i-75]
1. chemical energy
2. solar radiation energy
3. kinetic energy
4. heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity inside a clockwork radio? [9i-76]
1. chemical energy
2. gravitational potential energy
3. heat energy
4. elastic potential energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a hydroelectric power station? [9i-77]
1. gravitational potential => kinetic => electrical energy
2. chemical => heat => kinetic => electrical energy
3. heat => kinetic => electrical energy
4. elastic potential => kinetic => electrical energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a fossil fuel power station? [9i-78]
1. gravitational potential => kinetic => electrical energy
2. chemical => heat => kinetic => electrical energy
3. heat => kinetic => electrical energy
4. elastic potential => kinetic => electrical energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a geothermal power station? [9i-79]
1. gravitational potential => kinetic => electrical energy
2. chemical => heat => kinetic => electrical energy
3. heat => kinetic => electrical energy
4. elastic potential => kinetic => electrical energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a clockwork radio? [9i-80]
1. gravitational potential => kinetic => electrical energy
2. chemical => heat => kinetic => electrical energy
3. heat => kinetic => electrical energy
4. elastic potential => kinetic => electrical energy
electrical energy => useful/wasted energy outputs
energy input transfers as a 3 J/s of wasted sound energy
of 600 J/s to hair dryer 590 J/s of useful heat energy
the appliance is being used ? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 600 W). Which is the most likely missing quantity and form of output energy when the hair dryer is in use? [9i-81]
1. 7 J/s of useful kinetic energy
2. 7 J/s of wasted potential energy
3. 5 J/s of wasted kinetic energy
4. 5 J/s of useful potential energy
electrical energy => useful/wasted energy outputs
energy input transfers as a 5 J/s of useful kinetic energy
of 400 J/s to hair dryer 393 J/s of useful heat energy
the appliance is being used ? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 400 W). Which is the most likely missing quantity and form of output energy when the hair dryer is in use? [9i-82]
1. 2 J/s of useful kinetic energy
2. 2 J/s of wasted sound energy
3. 1 J/s of wasted kinetic energy
4. 1 J/s of useful potential energy
electrical energy => useful/wasted energy outputs
input energy transfers as a 4 J/s of useful kinetic energy
of 300 J/s to hair dryer 1 J/s of wasted sound energy
the appliance is being used ? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 300 W). Which is the most likely missing quantity and form of output energy when the hair dryer is in use? [9i-83]
1. 290 J/s of wasted kinetic energy
2. 295 J/s of wasted heat energy
3. 200 of J/s of useful heat energy and 95 J/s of wasted heat energy
4. 200 J/s of useful potential energy and 95 J/s of wasted heat energy

electrical energy => useful/wasted energy outputs
input energy transfers as a 80 J/s of wasted sound energy
of 1200 J/s to food mixer 620 J/s of wasted heat energy
the appliance is being used ? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 1.2 kW). Which is the most likely missing quantity and form of output energy when the food mixer is in use? [9i-85]
1. 500 J/s of useful kinetic energy
2. 500 J/s of useful potential energy
3. 300 J/s of useful heat and 280 J/s of wasted potential energy
4. 580 J/s of wasted heat energy
electrical energy => useful/wasted energy outputs
input energy transfers as a 370 J/s of useful kinetic energy
of 800 J/s to food mixer 400 J/s of wasted heat energy
the appliance is being used ? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 800 W). Which is the most likely missing quantity and form of output energy when the food mixer is in use? [9i-86]
1. 30 J/s of wasted kinetic energy
2. 30 J/s of wasted sound energy
3. 20 J/s of useful heat energy
4. 130 J/s of wasted heat energy

electrical	energy =>	useful/wasted energy outputs
energy input	transfers as a	3 J/s of wasted sound energy
of 600 J/s to	hair dryer	590 J/s of useful heat energy
the appliance	is being used	? J/s of ? energy

KS3 Physics Quiz 7J "Electricity and magnetism"