# 1. A battery of internal resistance 2 Ω is connected

advertisement ```1.
A battery of internal resistance 2 Ω is connected to an external resistance of 10 Ω. The current is
0.5 A.
What is the emf of the battery?
A.
1.0 V
B.
5.0 V
C.
6.0 V
D.
24.0 V
(Total 1 mark)
2.
Two electrodes, separated by a distance d, in a vacuum are maintained at a constant potential
difference. An electron, accelerated from one electrode to the other, gains kinetic energy Ek.
1
The distance between the electrodes is now changed to d.
3
What is the gain in kinetic energy of an electron that is accelerated from one electrode to the
other?
A.
Ek
3
B.
Ek
C.
3 Ek
D.
9 Ek
(Total 1 mark)
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3.
The graph shows the I–V characteristics of two resistors.
When resistors X and Y are connected in series, the current in the resistors is 2.0 A. What is the
resistance of the series combination of X and Y?
A.
7.0 Ω
B.
1.3 Ω
C.
1.1 Ω
D.
0.14 Ω
(Total 1 mark)
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4.
Two resistors, of resistance R1 and R2, are connected in series with a cell of emf ε and negligible
internal resistance.
Which expression gives the potential difference across the resistor of resistance R1?
A.
 R1

 R1  R 2



B.
 R1  R 2

 R1



C.
 R2

 R1  R 2



D.
 R1  R 2

 R2



(Total 1 mark)
5.
A point charge of magnitude 2.0 μC is moved between two points X and Y. Point X is at a
potential of +6.0 V and point Y is at a potential of +9.0 V. The gain in potential energy of the
point charge is
A.
0.20 μJ.
B.
1.5 μJ.
C.
6.0 μJ.
D.
30 μJ.
(Total 1 mark)
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6.
A resistor of resistance 12 Ω is connected in series with a cell of negligible internal resistance.
The power dissipated in the resistor is P. The resistor is replaced with a resistor of resistance 3.0
Ω. What is the power dissipated in this resistor?
A.
0.25 P
B.
P
C.
2.0 P
D.
4.0 P
(Total 1 mark)
7.
The electromotive force (emf) of a cell is defined as
A.
the power supplied by the cell per unit current from the cell.
B.
the force that the cell provides to drive electrons round a circuit.
C.
the energy supplied by the cell per unit current from the cell.
D.
the potential difference across the terminals of the cell.
(Total 1 mark)
8.
A copper wire, of electric resistance R, has a length L and a cross-section area S. Another copper
S
wire has a length 2L and a cross-section area of . Which of the following is the resistance of
2
this wire?
A.
R
4
B.
R
2
C.
2R
D.
4R
(Total 1 mark)
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9.
The graph shows how the current I in a resistor varies with the voltage V applied across it.
Which of the following gives the resistance of the resistor, when I = I1?
A.
V1
I1
B.
The slope of the curve at the point (V1, I1)
C.
I1
V1
D.
The inverse of the slope of the curve at the point (V1, I1)
(Total 1 mark)
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10.
Two 10 Ω resistors are connected as shown.
What is the resistance across PQ?
A.
0Ω
B.
5Ω
C.
10 Ω
D.
20 Ω
(Total 1 mark)
11.
Two resistors, made of the same material, are connected in series to a battery. The length of
resistor X is twice that of resistor Y, and X has twice the cross-sectional area of Y.
Which of the following gives
A.
1
4
B.
1
2
C.
1
D.
4
resistanceof X
?
resistanceof Y
(Total 1 mark)
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12.
The circuit shows a resistor R connected in series with a battery and a resistor of resistance 10
Ω. The emf of the battery is 20 V and it has negligible internal resistance. The current in the
circuit is 1.0 A.
Which of the following is the resistance of R?
A.
1.0 Ω
B.
2.0 Ω
C.
10 Ω
D.
20 Ω
(Total 1 mark)
13.
Three identical resistors are connected to a battery as shown.
Which of the following is a correct statement?
A.
The current through X is greater than that through Z.
B.
The potential difference across Z is greater than that across Y.
C.
The potential difference across resistor X and Y together is the same as that across Z.
D.
The current through Z is less than the total current through X and Y.
(Total 1 mark)
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14.
Two 6 Ω resistors are connected in series with a 6 V cell. A student incorrectly connects an
ammeter and a voltmeter as shown below.
The readings on the ammeter and on the voltmeter are
Ammeter reading / A
Voltmeter reading / V
A.
0.0
0.0
B.
0.0
6.0
C.
1.0
0.0
D.
1.0
6.0
(Total 1 mark)
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15.
The tungsten filament of a lamp has a cross-sectional area A and length L. For a potential
difference V across the filament, the current in the filament is I. The resistivity of the tungsten
equals
A.
V A
.
IL
B.
IL
.
V A
C.
VL
.
IA
D.
IA
VL
(Total 1 mark)
16.
A cell of emf ε and internal resistance r delivers current to a small electric motor.
450 C of charge flows through the motor and 9000 J of energy are converted in the motor. 1800
J are dissipated in the cell. The emf of the cell is
A.
4.0 V.
B.
16 V.
C.
20 V.
D.
24 V.
(Total 1 mark)
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17.
In the circuits below the cells have the same emf and zero internal resistance. The resistors all
have the same resistance.
Which of the following gives the ratio
A.
1
4
B.
1
2
C.
2
D.
4
power dissipated in X
?
power dissipated in Y
(Total 1 mark)
18.
A cylindrical conductor of length l, diameter D and resistivity ρ has resistance R. A different
cylindrical conductor of resistivity 2ρ, length 2l and diameter 2D has a resistance
A.
2R.
B.
R.
C.
R
.
2
D.
R
.
4
(Total 1 mark)
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19.
In the circuit below, the battery has negligible internal resistance. Three identical lamps L, M
and N of constant resistance are connected as shown.
The filament of lamp N breaks. Which of the following shows the subsequent changes to the
brightness of lamp L and lamp M?
Lamp L
Lamp M
A.
stays the same
decreases
B.
increases
stays the same
C.
increases
decreases
D.
decreases
increases
(Total 1 mark)
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20.
In the circuit below, the voltmeter has a resistance 100 k. The battery has negligible internal
resistance and emf 6 V.
The reading on the voltmeter is
A.
0 V.
B.
2 V.
C.
3 V.
D.
4 V.
(Total 1 mark)
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21.
In the circuit shown below, the cell has negligible internal resistance.
Which of the following equations is correct?
A.
I1 = 2I2
B.
I1 = 2I3
C.
I2 = 2I3
D.
I3 = 2I1
(Total 1 mark)
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