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Worksheets20 multiple choice A level electricity Q
Total questions: 20
Worksheet time: 30mins
Name
Class
Date
1.
In the circuit shown, the cell has an emf of 12 V and an internal resistance which is not negligible. When the resistance of the variable resistor is 10 Ω the voltmeter reads 10 V and the ammeter reads 1.0 A. The resistance of the variable resistor is changed to 5 Ω. What is the new reading on the ammeter?
a)
1.4 A
b)
1.7 A
c)
2.0 A
d)
2.4 A
2.
Two identical batteries each of emf 1.5 V and internal resistance 1.6 Ω are connected in parallel. A 2.4 Ω resistor is connected in parallel with this combination. What is the current in the 2.4 Ω resistor?
a)
0.38 A
b)
0.47 A
c)
0.75 A
d)
0.94 A
3.
A resistor with resistance R is made from metal wire of resistivity ρ. The length of the wire is L.What is the diameter of the wire?
a)
A
b)
B
c)
C
d)
D
4.
In the circuit below, the voltmeter reading is zero. When the temperature of the thermistor T is increased, the voltmeter reading changes. Which change to the circuit will restore the voltmeter to zero?
a)
a reduction in the emf of the cell
b)
a reduction in the resistance of P
c)
an increase in the resistance of Q
d)
a reduction in the resistance of R
5.
Three identical cells, each of emf 1.5 V and internal resistance 6.0 Ω, are connected to resistor R. The resistance of R is 6.0 Ω. What is the current in R?
a)
0.19 A
b)
0.25 A
c)
0.56 A
d)
0.75 A
6.
A power of 100 kW at a potential difference of 10 kV is transmitted to a load resistor through cables of total resistance 5.0 Ω. What is the power loss in the cables?
a)
50 W
b)
0.5 kW
c)
100 kW
d)
20 MW
7.
The diagram shows a network of four 2 Ω resistors. The effective resistance, in Ω, between X and Y is
a)
0.5
b)
1.2
c)
1.7
d)
2.0
8.
The diagram shows two wires, P and Q, of equal length, joined in series with a cell. A voltmeter is connected between the end of Q and a point X on the wires. The p.d. across the cell is V. Wire Q has twice the area of cross-section and twice the resistivity of wire P. The variation of the voltmeter reading as the point X is moved along the wires is best shown by(Total 1 mark)
a)
a
b)
b
c)
c
d)
d
9.
Copper metal is a good conductor of electricity because copper atoms in copper metal
a)
have gained an extra or "free" electron
b)
are ionised so that both ions and "free" electrons can move
c)
have a negative charge because of the "free" electrons
d)
have lost an electron to form positive ions and "free" electrons
10.
The 12 V battery in the circuit shown has negligible internal resistance. The diodes have 'ideal' characteristics. The current through the battery is approximately
a)
0 A
b)
0.10 A
c)
0.20 A
d)
0.40 A
11.
The circuit in Figure 1 is used to investigate how the potential difference V between the terminals of a cell varies as the current I in the circuit changes. Figure 2 shows the graph of the results.Which one of the following can be deduced from the gradient of the graph?
a)
The internal resistance of the cell
b)
The e.m.f. of the cell
c)
The power dissipated by the cell
d)
The resistance of the variable resistor
12.
The resistance of a metallic conductor increases with temperature because, at higher temperatures,
a)
more electrons become available for conduction
b)
the conductor becomes a superconductor
c)
the amplitude of vibration of lattice ions increases
d)
the length and cross-sectional area of the conductor both increase
13.
The overhead cables used to transmit electrical power by the National Grid usually consist of a central core of steel cables surrounded by a sheath of cables of low resistivity material, such as aluminium. What is the main purpose of the steel core?
a)
To force more current into the outer sheath.
b)
To provide additional current paths through the cables.
c)
To reduce the power lost from the cables.
d)
To increase the mechanical strength of the cables.
14.
A battery is connected to a 10 Ω resistor and a switch in series. A voltmeter is connected across the battery. When the switch is open (off) the voltmeter reads 1.45 V. When the switch is closed the reading is 1.26 V. What is the internal resistance of the battery?
a)
0.66 Ω
b)
0.76 Ω
c)
1.3 Ω
d)
1.5 Ω
15.
The National Grid uses high-voltage transmission lines to carry electrical power around the UK. A particular transmission line delivers 800 MW of power at 132 kV to the user. It loses 1% of the transmitted power as heat. What is the resistance of the transmission line?
a)
0.2 Ω
b)
6 Ω
c)
20 Ω
d)
2000 Ω
16.
A cell C of negligible resistance and a switch are in series with a resistor R. The switch is moved to the on (closed) position for a time t. Which change reduces the amount of charge flowing through R in time t?
a)
add an identical cell in parallel with C
b)
add an identical cell in series with C
c)
add a second resistor in series with R
d)
add a second resistor in parallel with R
17.
A resistor and diode are connected in series with a variable power supply as shown in the diagram. Which best shows the characteristic for the combination of the resistor and diode?
a)
a
b)
b
c)
c
d)
d
18.
In the circuit shown, V is a voltmeter with a very high resistance. The internal resistance of the cell, r, is equal to the external resistance in the circuit. external resistance Which of the following is not equal to the emf of the cell?
a)
the reading of the voltmeter when the Switch S is open
b)
the chemical energy changed to electrical energy when unit charge passes through the cell
c)
twice the reading of the voltmeter when the switch S is closed
d)
the electrical energy produced when unit current passes through the cell
19.
Which graph shows how the resistance per unit length r of a wire varies with diameter D of the wire?
a)
a
b)
b
c)
c
d)
d
20.
The graph shows the current–voltage (I–V) characteristics of a filament lamp. V / V What is the resistance of the filament when the potential difference (pd) across it is 4.0 V?
a)
500 Ω
b)
1700 Ω
c)
2000 Ω
d)
6000 Ω
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