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P4 Electric Circuits
1.
Which electrical symbol represents a lamp?
a) A
b) B
c) C
d) D
2.
Which electrical symbol represents a switch?
a) A
b) B
c) C
d) D
3.
Which electrical symbol represents a power supply?
a) A
b) B
c) C
d) D
4.
Which electrical symbol represents a cell?
a) A
b) B
c) C
d) D
5.
What component does symbol A represent ?
a) variable resistor
b) LDR
c) thermistor
d) fixed resistor
6.
What component does symbol B represent ?
a) fixed resistor
b) variable resistor
c) LDR
d) thermistor
7.
What component does symbol C represent ?
a) fixed resistor
b) variable resistor
c) thermistor
d) LDR
8.
What component does symbol D represent ?
a) variable resistor
b) LDR
c) fixed resistor
d) thermistor
9.
Which of these describes an electric current?
a) a flow of charge
b) a flow of voltage
c) a flow of power
d) a flow of electricity
10.
What unit is used for electric current?
a) volts
b) watts
c) joules
d) amps
11.
Why are metal wires able to conduct an electric current?
a) Metals contain charges (electrons) that are free to move.
b) Metals have a regular structure.
c) Metals have spare electrons in their outer shells.
d) Metals have extra protons to carry the current.
12.
When a current flows through a battery, which of these gets used up?
a) charge
b) chemical energy
c) electrons
d) current
13.
What type of particle is free to move and carry an electric current in metallic conductors?
a) electrons
b) protons
c) neutrons
d) ions
14.
When an electric current flows it …
a) it slowly gets used up.
b) produces a voltage.
c) always moves in a continuous loop.
d) always follows the shortest route.
15.
When a battery runs down it does so because it has run out of which of these?
a) charge
b) energy and charge
c) electrons
d) energy
16.
Why do electrical insulators not conduct electricity?
a) They are electrically neutral.
b) They do not contain electrons.
c) They do not contain charges that are free to move.
d) The atoms are fixed and can not move.
17.
Which term is used to describe how an ammeter should be connected into a circuit?
a) in parallel
b) in line
c) in series
d) before the bulb
18.
Which of these diagrams shows an ammeter correctly connected to measure the current through bulb 1?
a) A only
b) A , B, and C
c) B only
d) A and B
19.
How would you describe the following sentence? When an electric current flows through a bulb some of it gets used up.
a) sometimes wrong
b) always wrong
c) never wrong
d) often true
20.
Which of these is always needed to produce an electric current?
a) a battery
b) a potential difference
c) a metal wire
d) a complete circuit
21.
Calculate the electric current when 20 C of charge flows through an ammeter in 5 s
a) 5 Amps
b) 20 Amps
c) 100 Amps
d) 4 Amps
22.
Calculate the electric current when 12 C of charge flows through an ammeter in 4 s
a) 4 A
b) 48 A
c) 3 A
d) 16 A
23.
Calculate the amount of charge that flows if a current of 6 A runs for 3 s
a) 9 C
b) 2 C
c) 18 C
d) 0.5 C
24.
Calculate how long a current of 4 A will take to transfer 16 C of charge.
a) 4 s
b) 20 s
c) 64 s
d) 120 s
25.
Calculate how long a current of 2 A will take to transfer 40 C of charge.
a) 20 s
b) 4 s
c) 80 s
d) 160 s
26.
Calculate the resistance of a motor that has a current of 2 A when connected to a 6 V battery.
a) 12 ohms
b) 2 ohms
c) 3 ohms
d) 36 ohms
27.
Calculate the current through a 12 ohm resistor when connected to a 24 V battery.
a) 12.0 A
b) 2.0 A
c) 0.5 A
d) 1 A
28.
Calculate the voltage needed to get a current of 5 A flowing through a 6 ohm resistor.
a) 30 V
b) 1 V
c) 1.2 V
d) 0.83 V
29.
If a battery on a circuit is replaced by one with a higher voltage which of the following is true?
a) More electrons are available.
b) The battery will last longer.
c) The resistance will fall.
d) The current will increase.
30.
Increasing the resistance in a circuit will always do which of the following?
a) increase the current
b) reduce the voltage
c) reduce the current
d) increase the voltage
31.
Which graph shows a component with fixed resistance?
a) A
b) B
c) C
d) D
32.
Which graph shows a diode?
a) A
b) B
c) C
d) D
33.
Which graph shows a filament bulb?
a) A
b) B
c) C
d) D
34.
Which graph shows an ohmic conductor?
a) A
b) B
c) C
d) D
35.
Which component would you use to switch on some lights when it gets dark?
a) LED
b) LCD
c) LDR
d) RCD
36.
Which component would you use turn on a heater when it gets cold?
a) Transistor
b) Ohmic Conductor
c) Diode
d) Thermistor
37.
Which component would you find in a fridge thermostat?
a) Transistor
b) Ohmic Conductor
c) Diode
d) Thermistor
38.
Which component would you find in a rechargeable battery to prevent it being charged when fitted in the charger the wrong way around?
a) Transistor
b) Ohmic Conductor
c) Diode
d) Thermistor
39.
Which component would be best for making a resistor that has a fixed value?
a) Transistor
b) Ohmic Conductor
c) Diode
d) Thermistor
40.
How does the resistance of a thermistor depend upon light intensity?
a) Higher intensity gives higher resistance.
b) It does not
c) Higher intensity gives lower resistance.
d) The resistance is only zero when the light intensity is zero.
41.
How does the resistance of an LDR depend upon light intensity?
a) Higher intensity gives higher resistance.
b) It does not
c) Higher intensity gives lower resistance.
d) The resistance is only zero when the light intensity is zero.
42.
How does the resistance of an LDR (light dependent resistor) change is the light level is increased?
a) it decreases
b) it increases
c) it increases and then decreases
d) it decreases then increases
43.
How does the resistance of a thermistor change is the temperature is decreased?
a) it decreases
b) it increases
c) it increases and then decreases
d) it decreases then increases
44.
If the potential difference between two points in a circuit is 6 V then which of these is not true?
a) If 2 coulombs of charge flowed then 12 J of energy would be transferred.
b) If 3 coulombs of charge flowed then 18 J of energy would be transferred.
c) If 3 coulombs of charge flowed then 21J of energy would be transferred.
d) If 5 coulombs of charge flowed then 30 J of energy would be transferred.
45.
When two objects are rubbed together they become charged because…
a) friction generates charge.
b) electrons are transferred.
c) work in being done.
d) electrons decay into positrons.
46.
When two objects have the same electric charge they will…
a) attract.
b) heat up.
c) generate a current.
d) repel.
47.
If two electrically charged objects attract each other then their charges must…
a) be similar.
b) be equal.
c) be opposite.
d) cancel out.
48.
If you rub a balloon on your hair it can make your hair stand up because…
a) the build up of negative charge opposes gravity.
b) the balloon contains helium.
c) each strand of hair gets a different amount of charge.
d) the charges on your hair cause the individual hairs to repel each other.
49.
What type of charge do electrons have?
a) negative
b) positive
c) none
d) direct
50.
The attraction of two objects is caused by ….
a) gravitational forces.
b) a non-contact force.
c) magnetism.
d) an electric current.
51.
What process can occur if an electric field is strong enough to pull electrons out of molecules?
a) electrolysis
b) fission
c) fusion
d) sparking
52.
Which of the following surrounds a charged object?
a) electric current
b) magnetic field
c) electric field
d) magnetic current
53.
What will happen to a charged object placed in an electric field?
a) It will lose its charge.
b) The charges evaporate.
c) It's charge will be reversed.
d) It will feel a force.
54.
In which direction do the field lines point around a positive charge?
a) They all point away from the central charge.
b) They all point in towards the central charge.
c) The circle around the central charge.
d) They loop out and back to the central charge.
55.
In which direction do the field lines point around a negative charge?
a) They all point away from the central charge.
b) They all point in towards the central charge.
c) The circle around the central charge.
d) They loop out and back to the central charge.
56.
What does the direction of electric field lines show?
a) The direction of the force on a positive charge in the field.
b) The flow of electric charge.
c) The flow of an electric current.
d) The direction of energy flow.
57.
What happens to the size of the force as charged objects are moved closer together?
a) It decreases.
b) It remains unchanged.
c) It changes from attractive to repulsive.
d) It increases.
58.
What is the resistance of two 5 ohm resistors connected in series?
a) 25 ohm
b) 2.5 ohm
c) 10 ohm
d) 1 ohm
59.
If two resistors are connected in parallel then the overall resistance is….
a) greater
b) given by adding up the individual resistances
c) lower
d) given by subtracting the lowest from the highest.
60.
Pairs of resistors in series have a higher resistance because…
a) the first resistor reduces the current for the second.
b) the second resistor is protected from the current.
c) with two resistors in series the current is shared.
d) the battery must push the charges through both of them.
61.
Pairs of resistors in parallel have a lower resistance because…
a) there are more paths for the charge to move along.
b) the second resistor gets a boost from the first
c) each resistor only has half the work to do.
d) parallel resistors share the voltage.
62.
Which is the correct position to place an ammeter to measure the current through the resistor?
a) A or D
b) A, D or C
c) A
d) B
63.
Which is the correct position to place a voltmeter to measure the voltage across the resistor?
a) B
b) A
c) C
d) D
64.
Which is the correct position to place an ammeter to measure the current through the cell?
a) A, C or D
b) C
c) C or D
d) B
65.
Which is the correct position to place a voltmeter to measure the voltage across the cell?
a) B
b) A
c) C
d) D
66.
Adding extra identical batteries in series to a circuit will...
a) increase the voltage and current.
b) increase just the voltage.
c) increase just the current.
d) make no difference to the voltage and current.
67.
Adding extra identical batteries in series to a circuit will...
a) make the batteries last longer.
b) make the batteries go flat sooner.
c) make no difference to how long they will last.
d) reduce the power due to increased resistance.
68.
Adding extra identical batteries in parallel to a circuit will...
a) increase just the voltage.
b) increase just the current.
c) make no difference to the voltage and current.
d) increase the voltage and current.
69.
Adding extra identical batteries in parallel to a circuit will...
a) make the batteries go flat sooner.
b) make the batteries last longer.
c) make no difference to how long they will last.
d) reduce the power due to increased resistance.
70.
When components are connected in series which of the following is always true?
a) The voltage across them is the same.
b) The current through them is the same.
c) Both the current and voltage are the same.
d) Their resistance is the same.
71.
If a circuit has 3 bulbs in series each with a potential difference of 2 V what must be the potential difference across all three?
a) 2 V
b) 1 V
c) 5 V
d) 6 V
72.
Which of the following is the best explanation as to why the voltage across some components in series must add up to the voltage of the battery?
a) The components use up all the voltage from the battery.
b) The components share out the energy from the battery.
c) The work done by the battery must equal the work done by the components so energy is conserved.
d) The components each take their share of the voltage until it is all used up.
73.
Three resistors of resistance 1 ohm, 2 ohms and 3 ohms are connected in series to a power supply. Which will have the greatest potential difference across it?
a) 1 ohm
b) 2 ohms
c) 3 ohms
d) all the same
74.
Which of the following resistors will requite the charge to do the most work (transfer energy) to pass through them.
a) 20 ohm
b) 3 ohm
c) 40 ohm
d) all the same
75.
The potential difference across the battery is given by…
a) adding the potential difference across A and B.
b) averaging the potential difference across A and B
c) doubling the potential difference across A or B
d) multiplying the potential difference across A and B.
76.
If the resistance of A was increased then…
a) the potential difference across A would increase and that across B would remain the same.
b) the potential difference across A would increase and that across B would decrease.
c) The potential difference across A and B would decrease.
d) The potential difference across A and B would increase.
77.
If the resistance of A was decreased then…
a) the potential difference across B would remain the same.
b) the total potential difference would remain the same.
c) both potential differences would increase
d) both potential differences would decrease
78.
If the resistance of A was increased then…
a) the current in A and B would decrease.
b) the current in A would increase.
c) only the current in B would decrease
d) there would be no change in the current through B.
79.
If the resistance of A was decreased then…
a) the current in A would decrease.
b) the current in A would decrease.
c) the current in A and B would increase.
d) the current in A would decrease and the current in B would increase.
80.
If the resistance of A was increased then…
a) the current in A would increase.
b) the current in A and B would increase.
c) the current in A would decrease.
d) the current in A and B would not change.
81.
If the resistance of A was decreased then…
a) the current in the cell would decrease.
b) the current in the cell would remain unchanged.
c) the current in the cell would increase.
d) the current in B would increase.
82.
If the resistance of A was increased then…
a) the potential difference across A would not change.
b) the potential difference across A would increase.
c) the potential difference across A would decrease.
d) the potential difference across the cell would increase.
83.
If the resistance of A is greater than the resistance of B then…
a) the current through A will be equal to the current through B.
b) the current through A will be greater than the current through B.
c) the potential difference across A will be greater than that across B.
d) the current through A will be less than the current through B.
84.
Which of these gives a measure of the push of a battery on the charges in the circuit?
a) current
b) resistance
c) voltage
d) power
85.
Potential difference is another term for which of the following?
a) voltage
b) current
c) resistance
d) energy
86.
Which of these is the best definition for potential difference?
a) The rate of flow of charge.
b) The amount of charge in a circuit.
c) The amount of energy in a circuit.
d) The energy transferred by each coulomb of charge.
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