Download Topic 5 Review Multiple Choice Questions E1. Which graph shows

Topic 5 Review Multiple Choice Questions
E1.
Which graph shows the variation of current with voltage for the filament of a light bulb ?
A
B
I
E3.
E5.
I
0
V
low, low
B.
low, high
C.
high, high
D.
high, low
Consider a small string of lightbulbs used to decorate a tree. If one filament burns out the others will
A.
all go out
B.
glow dimmer than before
C.
glow just as bright as before
D.
glow brighter than before
8 ohms
What current flows through this circuit?
B. 0.5 A
C. 8 A
D.
16 A
E6. The variation with potential difference V of the current I
in an electric lamp is shown below.
At point P, the current is Ip, the potential difference is Vp
and the gradient of the tangent to the curve is G.
What is the resistance of the lamp at point P?
A.
1
G
B.
G
C.
Ip
Vp
D.
6V
8V
I
P
Ip
Vp
Ip
0
0
Vp
A 6 volt cell is connected to a circuit. Each electron that leaves the cell has ____________.
A.
E8.
V
Short circuits are dangerous because they involve ______ resistance and ______ current.
A. 0.25 A
E7.
0
V
If n charge carriers, each of charge q, pass a point in a time t, then the current in the circuit is
nq
qt
q
A.
.
B.
.
C.
.
D.
nqt.
t
n
t
A.
E4.
0
V
D
I
I
0
E2.
C
6 V of charge
B.
6 J of charge
C. 6 J of energy
D.
6 eV of energy
A conductor of constant resistance dissipates 12 W when the potential difference
across it is 12 V. The power that will be dissipated in this conductor when the potential difference
across it is 24 V is
A. 6.0 W
B.
12 W
C. 24 W
D. 48 W
V
E9. The resistors in each of the circuits shown below each have the same resistance.
circuit P
circuit Q
circuit S
Which of the following gives the circuits in order of increasing total resistance?
A.
P, Q, S
B.
Q, P, S
C.
S, Q, P
D.
P, S, Q
E10. The work done on a positive point charge of magnitude 3.0 nC as it is moved at constant speed from
one point to another is 12 nJ. The potential difference between the two points is
A. 0.0 V.
E11.
0.25 V.
C.
4.0 V.
D.
36 V.
A one hundred watt light globe gives out a brighter light than a 60 W globe because
A.
B.
C.
D.
E12.
B.
a larger potential difference is used to run it
it has a longer resistance wire filament
more electric current flows through it
it has a higher amount of inert gas in it
A six volt cell is connected to a resistor in a simple series circuit. If it was replaced by
a 12 volt cell, then there would be _______________ electrons leaving the cell per second,
and each electron leaving the cell would have_______________ energy.
A.
B.
C.
D.
the same number of
the same number of
twice as many
twice as many
the same amount of
twice as much
twice as much
the same amount of
E13. The electrical potential difference between two points is the …………….. required to
move a charge from one point to the other.
A. force
C. energy
B. force per unit charge
D. energy per unit charge
E14. A battery (negligible internal resistance) is connected to three identical lamps L, M and N of
constant resistance as shown. M and N are in parallel. The filament of lamp N breaks.
Which of the following shows the subsequent changes to the brightness of lamp L and lamp M?
A.
B.
C.
D.
lamp L
lamp M
stays the same
increases
increases
decreases
decreases
stays the same
decreases
increases
E15.
In the circuit above, if the resistors are not equal, which of the following must be true?
A.
B.
C.
D.
E16.
If two points in an electric circuit have the same potential then…
A.
B.
C.
D.
E17.
charges lose no energy travelling between the two points
the circuit must contain parallel branches
the supply must have no internal resistance
no current will flow between them
Consider a wire of resistance R. If it is stretched until it is twice its original length,
while keeping the same volume, its new resistance will be
A.
E18.
Lamps L and N have the same current through them.
Lamps L and M have the same current through them.
Lamps L and N have the same potential difference across them.
Lamps M and N have the same potential difference across them.
𝑅
2
B. R
C. 2R
D. 4R
Two rectangular blocks, X and Y, of the same material have different dimensions but the same
overall resistance. Which of the following equations is correct?
A. resistivity of X × length of X = resistivity of Y × length of Y
B. length of X × cross sectional area of Y = length of Y × cross sectional area of X
C. resistivity of X × cross sectional area of X = resistivity of Y × cross sectional area of Y
D. length of X × cross sectional area of X = length of Y × cross sectional area of Y
E19.
A strain gauge S is connected in series with a fixed resistor R. When a strain is placed upon the strain
gauge, the reading on the voltmeter will _____________ and the current will _________________.
A
B
C
D.
increase
decrease
increase
decrease
increase
increase
decrease
decrease
S
R
V
E20. A voltage V is applied across a fixed resistor (R ohms) in series with
a light dependent resistor of resistance L. The voltage across the LDR is given by
A.
𝑉
𝐿+𝑅
B.
𝐿+𝑅
𝑉
C.
𝐿𝑉
𝐿+𝑅
D.
1 b 2 b 3 b 4 a 5 a 6 d 7 d 8 d 9 b 10 c 11 c 12 c 13 c 14 d 15 d 16 a 17 d 18 b 19 c 20 c
𝑅+𝐿
𝑅𝑉