Download Physics Practice Quiz - Electricity and Magnetism

4/5/14
Science 30 Unit C: Physics
Practice Quiz 1
Name: _________
Date: _________
MC and NR: Place all answers on the answer sheet provided. (1 mark each)
/22
Use the following information to answer the next question.
A student drew field lines around a spherical source.
1. The student did not indicate what kind of field the diagram represented. The student’s diagram
most likely represents a(n)
a) electric field around a positively charged ball
b) electric field around a negatively charged ball
c) gravitational field around a massive ball
d) magnetic field around a magnetized ball
2. Which of the following is a source of a magnetic field?
a) an ebonite rod
b) an electrically charged cloud
c) a current-carrying coil of wire
d) a large iron sphere
NR 1
A balloon with a radius of 16.0 cm has an electric charge of 4.25 × 10–9 C.
The electric field strength at a distance of 40.0 cm from the balloon’s edge is ____
N/C.
(Record your three digit answer on the answer sheet provided.)
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4/5/14
NR 2
A student’s research indicates that Pluto’s radius is 1.172 x 106 m and its mass is
1.2 x 1022 kg. The gravitational field strength at Pluto’s surface is ______ N/kg.
(Record your three digit answer on the answer sheet provided.)
3. A group of students play jump-rope with an extension cord. As they move the cord in circles
within the Earth’s magnetic field the cord will induce a(n)
a) power
b) current
c) wattage
d) amp
4. The graph below that best shows the relationship between gravitational field strength, g, and
distance, r, is
a).
b)
Inverse Squared
c)
Directly Proportional
d)
Inversely Proportional
Inverse Parabola
5. A group of students build a simple motor from a battery, two paper clips, a magnet and a loop
of wire of fixed length. They modify the motor to attempt to have the armature spin faster by
replacing the battery with a battery with higher voltage.
The row that correctly describes one controlled, manipulated and responding variable in this
experiment is
a)
b)
c)
d)
Controlled
length of wire
length of wire
type of wire
current
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Manipulated
power
voltage
voltage
type of wire
Responding
speed of armature
magnetic field strength
number of wraps of wire
length of wire
4/5/14
Use the following information to answer the next three questions.
The diagram below shows a virtual circuit created by a student on a computer.
In the circuit, the battery has a voltage of 9.0 V. The top light bulb has a resistance of 10.0
Ω and the bottom light bulb has a resistance of 20.0 Ω. The resistance of the wire is
negligible.
6. The circuit above represents a
i
circuit and has a total resistance of
ii
ohms.
The column that best completes the blanks in the order given is
a)
b)
c)
d)
i
series
series
parallel
parallel
ii
30.0 Ω
6.7 Ω
30.0 Ω
6.7 Ω
7. The voltage across each bulb above is
ii _.
i _ . The current running through each bulb above is
The row that best completes the blanks in the order given is
a)
b)
c)
d)
NR 3
i
the same
the same
different
different
ii
different
the same
the same
different
The current at point 1 is a.b A. The current at point 2 is c.d A.
(Record your four-digit answer on the answer sheet provided.)
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8. An isolation transformer is a special transformer designed so that its input voltage is equal to
its output voltage. Its function is simply to keep sensitive devices electronically separate from the
circuit providing the power. If the number of loops in the primary coil of an isolation transformer
is 720, what number of loops should there be in its secondary coil?
a) 240 loops
b) 700 loops
c) 720 loops
d) 1440 loops
Use the following information to answer the next two questions.
A group of students build the following circuit as represented by the
schematic.
9. The total resistance of the circuit above is
a) 0.575 Ω
b) 1.74 Ω
c) 17.0 Ω
d) 160 Ω
10. If a fourth resistor was added to the circuit above, the total resistance of the circuit would
a) increase
b) decrease
c) remain unchanged
11. A low-resistance transmitting cable is used to carry 725 kW of electricity from a generating
station. If the electricity voltage is 25 000 V, what magnitude of current is flowing through the
cable?
a) 5.4 A
b) 29 A
c) 58 A
d) 62 A
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12. In England, the voltage of residential electrical outlets is 230 V. A visitor from Canada
brought along a suitable transformer to run her hair dryer, iron, and other appliances rated at 115
V. If the number of wire loops on the primary coil of her transformer is 1440 loops, how many
loops should there be on the transformer’s secondary coil?
a) 2880 loops
b) 1440 loops
c) 720 loops
d) 120 loops
13. Some dental equipment uses AC electricity and some uses DC. The basic difference between
AC and DC is that AC
a) uses high voltage, whereas DC uses low voltage
b) uses low voltage, whereas DC uses high voltage
c) has electron flow that changes direction, whereas DC has electron flow in only one direction
d) has electron flow in only one direction, whereas DC has electron flow that changes direction
NR 4
An electricity company charges $0.091 per kWh. The cost of leaving a 600 W
television on for 60 hours is $______.
(Record your three-digit answer on the answer sheet provided.)
WR – Show all work, including units, beginning formulas and significant digits to receive full
marks.
1. What amount of energy is being used if two 60 W light bulbs were left on for 5 hours?
Answer in kWh and MJ. (3 marks)
2. Describe how a circuit breaker reduces the risk of an electrical fire in a household electrical
circuit.
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Answer Key;
1. d
2. c
NR 1 – 122
NR 2 – 0.58
3. b
4. a
5. b
6. d
7. a
NR 3 – 1309
8. c
9. c
10. a
11. b
12. c
13. c
NR 4 – 3.28
WR 1 – 0.60 kWh, 2.16 MJ
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