Download 1. Electricity is the flow of through a substance. a. electrons b. water

1. Electricity is the flow of ____________________ through a substance.
a. electrons
b. water
2. If you have two positively charged objects, they will _________________ each other.
a. attract
b. repel
3. A substance that lets electric charges flow through easily is called a ______________.
a. passer
b. conductor
4. An object or substance is called a(n) __________________ if it doesn’t let electric
charges through easily.
a. insulator
b. restrictor
5. Which type of circuit will allow electrons to pass through it without stopping?
a. open
b. closed
6. Materials like glass are good ______________________ because they don’t give up their
electrons very easily.
a. insulators
b. machines
7. Which of these is measured in amperes?
a. electric current
b. static discharge
c. volume
d. sound energy
8. Resistance in an electrical circuit makes electricity flow ____________________.
a. faster
b. slower
9. A path for electricity is
a.
b.
c.
circuit
a light bulb
ampere
10. Just like electric charges, magnetic poles of opposite types will ________________ each
other.
a. attract
b. repel
11.
The diagram below shows the magnetic field lines for a bar magnet. Which statement below
best describes the strength of the magnetic field for the bar magnet?
a.
the magnetic field is strongest at north pole of the magnet
b.
the magnetic field is strongest at the south pole of the magnet
c.
the magnetic field is strongest at both the north and south poles
d.
the magnetic field is strongest in the region between the north and south poles
12. The force between two charges increases as they get
.
a.
b.
c.
d.
closer together
farther apart
hotter
colder
13. Which of the following best describes the circuit below?
a.
open circuit in series
b.
closed circuit in series
c.
open circuit in parallel
d.
closed circuit in parallel
14. Magnetic field lines that curve away from each other show
a.
b.
c.
d.
15. If
.
where the magnetic field is strongest
a magnetic domain
repulsion
attraction
you break a magnet in two, you get
a.
one north magnet and one south magnet.
b.
two demagnetized pieces of metal.
c.
two smaller magnets.
d.
two magnets each with only one pole.
16. Magnetic fields are created by
.
a.
magnetic field lines
b.
potential energy of molecules
c.
spinning neutrons
d.
moving electric charge (electricity)
17. What effect does increasing the current flowing in the wire have on an electromagnet?
a.
It increases the strength of the magnetic field.
b.
It causes it to become a permanent magnet
c.
It has no effect on the electromagnet.
d.
It decreases the strength of the magnetic field.
18. Which of the following will have the lowest resistance?
a. a long, thick copper wire at a high temperature
b. a long, thin copper wire at a high temperature
c. a short, thick copper wire at a low temperature
d. a short, thin copper wire at a low tempertature
19. Two lightbulbs are connected in a series circuit. Which of the following statements BEST
predicts what will happen if a third lightbulb is added in series to the circuit?
a. all three bulbs will be brighter than the two bulbs alone
b. all three bulbs will be dimmer than the two bulbs along
c. all three bulbs will shine with the same brightness as the two bulbs along
d. all three bulbs will burn out
20. What would cause an electromagnet to stop working?
a. exposing it to a permanent magnet
b. dropping the temperature to below 32 degrees F
c. turning off the source of electricity
d. reducing the amount of available sunlight
21.
Which of these best describes this type of circuit?
a. Open
b. Series
c. Parallel
d. Alternating
22. What type of circuit is shown by the diagram above?
a. alternating circuit
b. short circuit
c. series circuit
d. parallel circuit
23. The disadvantage of a series circuit is?
a. it allows only one path for an electric current
b. it allows many paths for an electric current
c. there are no disadvantages of series circuits
24. An electromagnet used in a junkyard can only pick up cars. How could the electromagnet be
improved so that it could lift trucks and other large vehicles?
a. increase the number of coils
b. decrease the number of coils
c. use a thinner wire
d. decrease size of battery
1. A
2. B
3. B
4. A
5. A
6. A
7. A
8. B
9. A
10. A
11. A
12. A
13. B
14. C
15. C
16. D
17. A
18.
19. C
20.
21. C
22. D
23. A