Series and Parallel Circuits
Practice Test
1.
If the combined resistance of the potentiometer and motor in Figure 22-5 is 250 Ω, what is the current through the circuit?
a.
120 A
b.
3000 A
c.
21 A
d.
48 mA
Hint
2.
A single bump or disturbance that travels through a medium is a ___________.
a.
compressional wave
b.
surface wave
c.
wave pulse
d.
continuous wave
Hint
3.
A 60-Ω resistor and a 30-Ω resistor are in parallel. What is the equivalent resistance?
a.
20 Ω
b.
90 Ω
c.
2 Ω
d.
30 Ω
Hint
4.
In Figure 21-7b, if both charges were 7.0
μ
C and the left charge were held in place while the right charge were moved from a separation of 0.4 m" to "0.40 m, how much work would be done on the system?
a.
1.1 J
b.
2.2 J
c.
-2.2 J
d.
-1.1 J
Hint
5.
The SI standard unit of charge is the __________.
a.
ohm
b.
volt
c.
coulomb
d.
joule
Hint
6.
What are the two kinds of electrical charges?
a.
destructive and constructive
b.
high and low
c.
positive and negative
d.
static and dynamic
Hint
7.
If the charge of an atom's nucleus is +2 and the charge of the surrounding electrons is -2, the atom is __________.
a.
positively-charged
b.
electrically neutral
c.
unstable
d.
negatively-charged
Hint
8.
Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.
a.
away from, toward
b.
toward, away from
c.
toward, toward
d.
away from, away from
Hint
9.
If the resistance of the lightbulb in Figure 22-3 were changed to 6 Ω, what would tha ammeter read?
a.
8 A
b.
6 A
c.
2 A
d.
4 A
Hint
10.
A __________ wave bounces off a boundary.
a.
reflected
b.
incident
c.
transverse
d.
surface
Hint
11.
A trough is __________ of a wave.
a.
the starting point
b.
the low point
c.
the high point
d.
the midpoint
Hint
12.
Thermal energy is given by:
a.
E
=
IR
b.
E
=
P
2
t
c.
E
=
I
2
R
d.
E
=
Pt
Hint
13.
The superposition of waves with equal but opposite amplitueds causes __________.
a.
constructive interference
b.
destructive interference
c.
dissidence
d.
consonance
Hint
14.
If you have two lights in parallel and you add another identical light in parallel, what happens to the total current?
a.
It goes to zero.
b.
It decreases.
c.
It remains the same.
d.
It increases.
Hint
15.
A positive test charge of 9.0 × 10
-5
" to "9.0×10
-5
C is in an electric field that exerts a force of 3.7×10
-5
N on it. What is the magnitude of the electric field at the location of the test charge?
a.
0.24 N/C
b.
2.4 N/C
c.
0.41 N/C
d.
4.1 N/C
Hint
16.
When the electric potential difference between two positions in an electric field is zero, the positions are __________.
a.
close together
b.
in equilibrium
c.
polar
d.
at equipotential
Hint
17.
If a charge were added to Figure 20-11b between the two charges already there, what direction would the net force on it be?
a.
To the left if charge is positive, to the right if it's negative.
b.
To the right if charge is positive, to the left if it's negative.
c.
This cannot be determined without knowing more about the location of the charge
d.
To the right, regardless of its sign
Hint
18.
A 12.0 V battery delivers a 1.20 A current to an electric motor that is connected across terminals. What power is consumed by the motor?
a.
10.0 W
b.
14.4 J
c.
10.0 J
d.
14.4 W
Hint
19.
Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off?
a.
The current drops to almost zero.
b.
The voltage becomes too much for the circuit to handle.
c.
As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.
d.
As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.
Hint
20.
What causes a fuse to blow?
a.
too low a resistance
b.
too much resistance
c.
too high a voltage
d.
too high a current
Hint
