Slide 1 / 31
1 A 60-W light bulb operating on a 120-volt household
circuit has a resistance closest to
A
B
C
D
E
60 Ω
120 Ω
240 Ω
180 Ω
360 Ω
Slide 2 / 31
2 Which of the following is equivalent to the unit of
electrical resistance?
A C/V
B V/A
C A/V
D V/C
E C/J
Slide 3 / 31
3 A copper wire has a length L and cross-sectional
area A. Another copper wire has a length of 2L and
cross-sectional area 4A. What is the ratio of the
resistivity of the second wire to the resistivity of the
first one?
A 1/2
B 1/4
C 2/1
D 4/1
E 1/1
Slide 4 / 31
4 If E is the electric field strength and J is the electric
current density, what is the ratio of E/J?
A Resistance
B
C
D
E
Resistivity
Voltage
Current
Work
5 Two tungsten wires with different cross-sectional
areas and currents are shown on the diagram.
Current I has a cross-sectional are A and runs an
electric current I. Current II has a cross-sectional are
2A and runs an electric current 4I. What is the ration
of drift velocity of particles in the second wire to that
in the first one?
Slide 5 / 31
A 2/1
B 1/2
C 4/1
D 1/4
E 1/1
Slide 6 / 31
6 The following graphs represent the resistivity as a
function of absolute temperature. Which of the
graphs shows the resistivity change of a metallic
wire?
A
D
C
B
E
Slide 7 / 31
7 An electric current of 1 A flows through a circuit. The
part of the circuit contains a 12 V battery with an
internal resistance of 2 Ω. What is the voltmeter
reading?
A 4V
B 8V
C 10 V
D 12 V
E 16 V
Slide 8 / 31
8 An electric current of 2 A flows through a circuit. The
part of the circuit contains a 6 V battery with an
internal resistance of 0.5 Ω. What is the voltmeter
reading?
A 3V
B 4V
C 5V
D 6V
E 7V
9 An ammeter with an internal resistance of 3.6x10-3 Ω
is design to measure the maximum current of 0.2 A
(full-scale-deflection). It was predicted that the
maximum current in the circuit is 2 A. What must the
shunt resistance be and how it has to be connected
to the ammeter in order to measure the current in the
given circuit?
A 3.6×10-3 Ω in parallel
B 3.6×10-3 in series
C 4×10-4 Ω in parallel
D 4×10-4 Ω in series
E 1.8×10-4 Ω in parallel
Slide 9 / 31
Slide 10 / 31
10 A voltmeter with an internal resistance of 20 Ω is
design to measure the maximum voltage of 2 V (fullscale-deflection). It was predicted that the maximum
voltage in the circuit is 120 V. What must the shunt
resistance be and how it has to be connected to the
voltmeter in order to measure the voltage in the
given circuit?
A 11,800 Ω in series
B 11,800 Ω in parallel
C 1,180 Ω in series
D 1,180 Ω in parallel
E 118,000 Ω in series
Slide 11 / 31
11 Five different electric circuits are connected to the
same battery with negligible resistance. Which circuit
has the least current through the battery?
B
A
C
D
E
Slide 12 / 31
12 Five different electric circuits are connected to the
same battery with negligible resistance. Which circuit
produces the greatest power dissipation?
B
A
C
D
E
13 The emf of a battery is 6 V. When the battery delivers
a current of 0.5 A to the external circuit, the potential
difference between the terminals of the battery is 5.8
V. The internal resistance of the battery is
Slide 13 / 31
A 0.4 Ω
B 4Ω
C 0.6 Ω
D 6Ω
E 2Ω
Slide 14 / 31
14 A wire is connected to a battery of a constant voltage
and negligible internal resistance. By decreasing
which of the following we can increase the power
dissipated in the wire?
A L only
B d only
C L and ρ only
D d and ρ only
E ρ only
15 Two resistors with resistance 3 Ω and 2 Ω
respectively are connected in series with a 12 V
battery. The current in the circuit is 2 A. What is the
internal resistance?
A 1Ω
B 2Ω
C 3Ω
D 0.5 Ω
E 0.2 Ω
Slide 15 / 31
Slide 16 / 31
16 Two resistors with resistance of 30 Ω and 60 Ω
respectively are connected in parallel with a 6 V
battery. The current in the circuit is 0.25 A. What is
the internal resistance?
A 1Ω
B 2Ω
C 3Ω
D 4Ω
E 5Ω
Slide 17 / 31
17 Which of the following graphs represents the current
as a function of resistance?
B
A
C
D
E
Slide 18 / 31
18 A rheostat is connected across a battery with a
constant voltage. Which of the following graphs
represents the power P dissipated by the rheostat as
a function of its resistance R?
B
A
C
D
E
Slide 19 / 31
19 Three identical resistors are connected to each other
in four different combinations. Which of the given
circuits has the greatest resistance?
I
II
III
IV
A Only I
B Only II
C Only III
D Only IV
E II and IV
Slide 20 / 31
20 A wire of resistance R dissipates power P when a
current I passes through it. The wire is replaced by
another wire with resistance 3R. The power
dissipated by the new wire when the same current
passes through it is
A P/9
B P/3
C P
D 3P
E 6P
Slide 21 / 31
21 The circuit in the diagram above contains three identical light bulbs connected as shown. Initially, a
switch connected to light bulb I is closed. Which of
the following is correct about brightness of light
bulb II and III is correct when the switch is open?
Bulb II
Bulb III
A Gets brighter
Gets dimmer
B Gets dimmer
Gets brighter
C Gets brighter
Gets brighter
D Gets dimmer
Gets dimmer
E Goes out
Gets brighter
Slide 22 / 31
22 What is the current in the circuit above?
A 4A
B 2A
C 1A
D 0.5 A
E 0.25 A
Slide 23 / 31
23 What the potential difference across the 2 Ω resistor
in the circuit above?
A 1V
B 2V
C 4V
D 6V
E 18 V
Slide 24 / 31
24 The power dissipated in 6 Ω resistor in the circuit
above is close to
A 10.7 W
B 5.3 W
C 24.5 W
D 37.2 W
E 43.4 W
Slide 25 / 31
25 Which of the following is true about the current
through resistor R and charge in the capacitor,
immediately after the switch is closed?
Current I
Charge Q
A Zero
Maximum
B Maximum
C Zero
Zero
Zero
D Maximum
Maximum
E Stays unchanged Stays Unchanged
Slide 26 / 31
26 Which of the following is true about the current
through resistor R and charge in the capacitor, when
the switch is closed for a long time?
Current I
Charge Q
A Zero
Maximum
B Maximum
Zero
C Zero
D Maximum
Zero
Maximum
E Stays unchanged
Stays unchanged
Slide 27 / 31
27 A circuit is connected to a 9 V battery with a net
resistance of 40.5 Ω. How much energy is dissipated
by the circuit in time interval of 1 min?
A 120 J
B 240 J
C 360 J
D 60 J
E 30 J
Slide 28 / 31
28 A resistor R = 1x106 Ω, a capacitor C = 1 nF are
connected in series with a battery V and switch S.
What is the time constant of the circuit?
A 10-6 s
B 10-3s
C 10-9s
D 106s
E 103s
Slide 29 / 31
29 In order to measure the current and voltage through
a circuit how must an ammeter and voltmeter be
connected to a circuit?
Ammeter
Voltmeter
A in parallel
in series
B in parallel
in parallel
C in series
in series
D in series
in parallel
E none from the above
none from the above
Slide 30 / 31
30 A battery with internal resistance R and an
electromotive force ε supplies a current I to a light
bulb of resistance r. The power dissipated by the
circuit is
A ε2/(R+r)
B (ε-IR)2/R
C (ε-IR)2/(R+r)
D ε2/R
E (ε+IR)2/(R+r)
Slide 31 / 31