Electricity Practice Test
http://chss.sd57.bc.ca/~spearce/Science_9/Practice%20Tests/ElectricityPractiseTest.htm
True/false.
1. Electrons carry a positive charge. _______________
2. Static charge means charges at rest._____________
3. A positive charge is the result of gaining electrons. _
4. A object is neutral if it has equal numbers of protons
and neutrons. _______________________
5. Charging by conduction requires two objects to
touch. _________________________
6. Charging by friction requires two objects to touch. __
7. “Static cling” on clothes from the dryer is caused
by induction. _________________________
8. The law of electric charges states that like
charges attract. _________________________
9. The unit of voltage is amperes. ______
10. A circuit with more than one possible pathway is
called a series circuit. ____________________
11.In a parallel circuit, current goes through all of the
devices in the circuit. __________________
12.A voltmeter is used to measure the amount
of resistance measured across a resistor. __________
13.The unit of measurement for resistance is
the ampere. _________________________
14.The following image is the symbol for a switch. ___
15.In a series circuit, the current is the same
throughout. ___
16.In a series circuit, the current divides into smaller
amounts in each pathway. _______________
17.A unit of energy is the kW•h. ______
1.What will happen when two oppositely charged balloons are brought close together?
A.
B.
C.
D.
They will move toward each other.
They will move away from each other.
They will move together, then apart.
They will be unaffected by each other.
2. What will happen when a charged balloon is brought close to a neutrally charged object?
A. They will move toward each other.
B. They will move away from each other.
C. They will move together, then apart.
D. They will be unaffected by each other.
3. What must happen to an atom to become negatively charged?
A. It must lose one or more electrons.
B. It must lose one or more protons.
C. It must gain one or more electrons.
D. It must gain one or more protons.
4. Which of the following is considered to be a dangerous example of static electricity?
A. light bulb
B. fabric softener sheets
C. laser printer
D. lightning
5. Which of the following is the law of electric charges?
A.
B.
C.
D.
opposite charges repel; like charges attract
like charges repel; opposites charges attract
neutral objects attract charged objects
neutral objects do not attract charged objects
6. Which of the following can be described as a transfer of charge to produce a charged object?
A.
B.
C.
D.
charging by friction
charging by conduction
charging by induced charge separation
both (a) and (b)
7. Which of the following charging methods must involve contact between objects?
A. charging by friction
B. charging by conduction
C. charging by induced charge separation
D. both (a) and (b)
8. What is the name for the object used to prevent unwanted build-up of charge?
A. insulator
B. conductor
C. ground wire
D. semiconductor
9. Which of the following describes a conductor?
A. electrons move freely
B. electrons do not move freely
C. protons move freely
D. protons do not move freely
10. Which of the following are units of charge?
A. coulombs
B. newtons
C. electrons
D. protons
11. Which of the following best describes the use of an electroscope?
A. measures electric charge
B. indicates the presence of charge
C. measures the amount of induced charge
D. indicates neutral charge
12. What is the difference between charging by conduction and charging by friction?
A. charging by friction requires one object to be charged
B. charging by conduction involves two neutral objects
C. charging be conduction requires one object to be charged
D. charging by friction involves induction
13. What is the difference between charging by conduction and charging by induction?
A. charging by conduction requires one object to be charged
B. charging by induction requires a ground
C. charging be conduction requires two neutral objects
D. charging by induction involves conduction
14. What is the difference between charging by conduction and charging by induction?
A. charging by conduction involves transfer of charge
B. charging by induction involves transfer of charge
C. charging by conduction does not involve transfer of charge
D. charging by conduction is the same as charging by induction
15. Rabbit fur tends to lose electrons to an acetate strip when they are rubbed together. Which of the
following will be true when this happens?
A. the acetate will be positive; the fur will be positive
B. the acetate will be negative; the fur will be negative
C. the acetate will be positive; the fur will be negative
D. the acetate will be negative; the fur will be positive
16. Which of the following explains why the charge on an atom is neutral?
A. an atom contains neutrons
B. an atom has protons and neutrons
C. an atom has equal numbers of protons and neutrons in the nucleus
D. an atom has equal numbers of protons and electrons
17. Which of the following is not an example of static charge?
A. stationary electrons
B. stationary protons
C. moving electrons
D. stationary neutrons
18. Which of the following is used to measure electric potential difference?
A. ohmmeter
B. ammeter
C. energy meter
D. voltmeter
19. Which of the following terms describes a lamp connected in a circuit?
A. load
B. energy source
C. cell
D. switch
20. Which of the following describes an electric circuit?
A. stationary charges
B. a continuous path for electricity to flow through
C. the process of building a charge through friction on the carpet
D. a battery connected by plastic to a light bulb
21. Which of the following is a series battery of two cells?
A.
B.
C.
22. What is current?
A. total energy contained in the battery
B. amount of energy flowing in a circuit
C. total amount of charge
D. amount of charges flowing past a point per second
D.
23. Which of the following shows resistors in parallel?
A.
B.
C.
D.
24. What is a voltmeter used to measure?
A. potential difference
B. resistance
C. power
D. current
25. Which of the following is the unit for measuring electric current?
A. ampere
B. volt
C. coulomb
D. ohm
26. Which of the following is used to measure current?
A. ohmmeter
B. ammeter
C. electric meter
D. voltmeter
27. An ohm is a unit of which of the following?
A. electric potential difference
B. resistance
C. current
D. power
28. Which of the following represents Ohm’s Law?
A.
B.
C.
D.
29. Which of the following is a unit for power?
A. kWh
B. W
C. J
D. V
30. How much power is used by a light bulb connected to a 120 V source, drawing 2 amps of
current?
A. 240 W
B. 60 W
C. 0.017 W
D. 120 W
1. An object with equal numbers of positive and negative charges is said to be _______.
2. When two objects are rubbed together and one object gains electrons, the other object _____ electrons.
3. When two neutral objects are rubbed together producing a charge on both, this is called charging by _.
4. An object is ____________________ if it is connected to Earth by a conductor.
5. The ____________________ is the part of the circuit that converts electrical energy into other forms.
6. The unit of measure of current is the ____________________.
7. Electrons flow from the ____________________ terminal to the ____________________ terminal.
8. A circuit that has only one pathway for current flow is called a ____________________ circuit.
9. _________________________ is the law that defines resistance as the ratio of potential difference to
current through a resistor.
10. Adding more resistors in series will ____________________ the overall resistance of the circuit.
11. Adding more resistors in parallel will ____________________ the overall resistance of the circuit.
12. ____________________ in a series circuit is the same at all points in the circuit.
13. Electricity in the homes of British Columbia is measured in ________ and priced at about $0.08 per unit.
Match the terms below with the following definitions.
A. does not allow movement of charge
D. separation of protons and electrons
B. allows movement of charge
E. lightning
C. safe from unwanted charge
1. insulator
2. static discharge
3. induced charge
4. Conductor
5. grounded
Match the part of the circuit analogy to the part of the circuit it represents.
A. wire
D. current
B. battery
E. voltage loss
C. load
6. water falling down through water wheel
7. trough (waterway)
8. water wheel
9. water pump lifting water
10. flowing water
Design and draw, with all the meters, batteries, switches, etc.:
A) a parallel circuit
B) a series circuit