Download Name 2013 CRCT ELECTRICITY + MAGNETISM REVIEW 1). What

Name ___________________________
2013 CRCT ELECTRICITY + MAGNETISM REVIEW
1). What happens if you break a magnet in half?
A) One half will have a north pole only and one half will have
a south pole only.
B) Neither half will have a pole.
C) Each half will be a new magnet, with both a north and a
south pole.
D) Neither half will be able to attract or repel.
6). The size of an electric force depends upon which two
things?
A) the number of protons and the distance between
the charges
B) the amount of each charge and the distance
between the charges
C) the amount of each charge and the size of the
electric field
D) the distance between the charges and the size of the
electric field
7). The buildup of charges on an object is called
A) static discharge.
C)
positive charge.
B) static electricity.
D)
negative charge.
Use the diagram above to answer the following two questions.
2. Which pair of magnets is arranged so that opposite poles
are placed near each other? How can you tell?
A). Magnet pair B; the magnetic fields overlap and combine.
B). Magnet pair B; the magnetic field lines push away from
one another.
C). Magnet pair C: the magnetic field lines overlap and
combine.
D). Magnet pair C; the magnetic field lines push away from
one another.
3). Which pair of magnets is arranged so that like poles are
placed near each other? How do you know?
A). Magnet pair B; the magnetic fields overlap and combine.
B). Magnet pair B; the magnetic field lines push away from
one another.
C). Magnet pair C: the magnetic field lines overlap and
combine.
D). Magnet pair C; the magnetic field lines push away from
one another.
4). Based on the diagram, where is the magnetic force
around magnet B the strongest? How can you tell?
A). Near the center of the magnet; there are no field lines
there.
B). Near the poles; the magnetic field lines are closer
together in those areas.
C). Near the poles; there are no field lines there.
D). Near the center of the magnet; field lines are closer
together in this area.
5). Tara rubs a balloon on her hair and charges both her hair
and the balloon. What will happen if Tara holds the balloon
close to her hair?
A) Her hair will be repelled by the balloon because her hair
and the balloon have the same charge.
B) Her hair will be attracted to the balloon because her hair
and the balloon have the same charge.
C) Her hair will be attracted by the balloon because her hair
and the balloon are oppositely charged.
D) Her hair will be repelled to the balloon because her hair
and the balloon are oppositely charged.
MATCHING
8). A) electric current
B) electric circuit
C) resistance
D)
E)
F)
electric charge
resistor
switch
_____
_____
_____
a property of electrons and protons
the flow of charge through a material
a device that uses electrical energy as it interferes
with the flow of charge
_____ a complete path through which electric charges can
flow
_____ used to open and close an electric circuit
_____ opposition to the movement of charges flowing
through a material
9). What happens to the current if the voltage increases and
the resistance stays constant?
A) Current decreases.
C) Current stops.
B) Current increases.
D) Current remains constant.
10). Which of these would lower the electrical resistance of
a wire?
A) decreasing the wire’s length
B) increasing the temperature of the wire
C) making the wire thinner
D) using denser material such as iron for the wire
11). Which of the following is NOT a process used to
transfer electrical energy to your home.
A) Steam causes a generator to push and pull electrons along
a wire.
B) A transformer boosts the voltage because a current loses
energy while traveling.
C) Another transformer steps down the voltage to a safe
level before the current enters your home.
D) A person turns off the switch the complete the circuit.
12). Which of the following is NOT an insulator?
A) air
C) glass
B) wood
D) copper
13). When we call a circuit a “closed circuit” we mean
A). the current is blocked and cannot flow.
B). There is only one path for current to flow through
C). The pathway is complete with no gaps and current can flow.
D). There is only one device connected to the power source.
14). What kind of circuit is pictured below?
A). a series circuit
B). a parallel circuit
C). a neutral circuit
D). a short circuit
15). What would happen if bulb 1 in Circuit B burned out?
A). Bulb 2 would go out, but bulb 3 will remain lit.
B). Bulb 2 would remain lit, but bulb 3 will go out.
C). Bulb 2 and 3 would go out.
D). Bulb 2 and 3 would remain lit.
16). What kind of circuit is pictured below?
21). When you add loads (branches) to a parallel circuit,
what do you know about the current?
A). There is less current for the remaining branches.
B). The line current gets larger when loads are added.
C). Resistance increases as loads are added.
D). The total current is decreased as more loads are added.
22). Which of the following objects is a resistor?
A) a switch.
B) a battery.
C) an electrical current.
D) a toaster.
23). What do electrons moving in an electric current
produce?
A) a solenoid
C) an aurora
B) a magnetic field
D) a bar magnet
24). What causes a current to flow?
A) an imbalance of extra electrons C) a magnetic field
B) an imbalance of protons
D) the magnetic domains
A). a series circuit
B). a parallel circuit
C). a discharge circuit
D). a short circuit
17). What will happen if the switch is opened in the circuit
above?
A). Bulb 1 and 2 would go out, but bulb 3 will remain lit.
B). Bulb 2 and 3 would go out but bulb 1 will remain lit.
C). All three bulbs will go out.
D). All three bulbs will remain lit.
18). What will happen to bulbs 2 and 3 in circuit pictured
below if bulb 1 burns out?
25). A solenoid with a ferromagnetic core is called a(n)
A) electromagnet.
B) magnetic pole.
C) an insulator.
D) temporary magnet.
26). You can increase the strength of an electromagnet’s
field by
A) decreasing the current in the wire.
B) decreasing the number of loops in the wire.
C) using a stronger ferromagnetic material for the core.
D) increasing the thickness of the insulation on the wire.
27). Electromagnetic waves are produced by
A).
B).
C).
D).
Both bulbs will go out.
Both bulbs will remain lit.
Bulb 2 would go out, but bulb 3 will remain lit.
Bulb 2 would remain lit, but bulb 3 will go out.
19). How should Pedro wire four bulbs in a circuit so that all
the bulbs shine as brightly as possible?
A) He should wire all four bulbs in a series circuit.
B) He should wire two bulbs in a parallel circuit and the
other two bulbs in a series circuit.
C) He should wire three bulbs in a series circuit and the
other bulb in a parallel circuit.
D) He should wire all four bulbs in a parallel circuit
20). When two bulbs are connected in series, which is true?
A). The current through both is the same .
B). The current through one plus the current through the
other equals the line current.
C). Together they have less resistance than either would alone.
D). There is danger of overloading the circuit.
A) Earth’s magnetic field.
B) static electricity.
C) the vibration of iron filings.
D) the vibration of an electric field and a magnetic field
together.
28). Which electromagnetic waves have the longest
wavelengths and lowest frequencies?
A). radio waves
B). visible light
C). infrared waves
D). gamma rays
29). Visible light has a higher frequency than
A).
X-rays.
B). infrared radiation.
C). ultraviolet radiation
D). gamma rays
30). Waves with higher frequencies have higher energies.
Which rays have the highest energy?
A). radio waves
B). x rays
C). ultraviolet radiation
D). gamma rays
31). The electromagnetic spectrum is divided into regions
by
A) colors.
C) wavelengths.
B) the way they are used.
D) speed.