Indiana Science Grade 8

Chapter 10: Electricity

Electricity

1.
Copper is an example of what?
A)an insulator
B)an electrical force
C)a conductor
D)an ion
2.
As resistance increases, what happens to current?
A)It stays the same.
B)It increases.
C)It fluctuates randomly.
D)It decreases.
3.
Why do batteries run down?
A)the protons are all gone
B)there are too many electrons
C)there are too many protons
D)the electrons in the chemicals are used up
4.
What kind of circuit has more than one path for current flow?
A)parallel
B)conducting
C)series
D)voltage
5.
When devices are added to a series circuit, what happens to the current?
A)It increases.
B)It stays the same.
C)It fluctuates randomly.
D)It decreases.
6.
How much energy is needed to run a 50-W lightbulb for 5 hours?
A)0.25 kWh
B)10 kWh
C)0.01 kWh
D)250 kWh
7.
What force keeps protons and neutrons together in a nucleus?
A)weak nuclear force
B)gravitational force
C)electrical force
D)strong nuclear force
8.
When something is grounded, what happens to the excess electrical charge?
A)It is drained into the atmosphere.
B)It is drained into the Earth.
C)It disappears.
D)It is stored in the grounded equipment.
9.
What kind of circuit has only one path for current flow?
A)parallel
B)series
C)voltage
D)conducting
10.
What variable does Ohm's law NOT describe?
A)voltage
B)resistance
C)power
D)current
11.
What happens to the strength of an electrical field as you get closer to it?
A)It disappears.
B)It remains the same.
C)It decreases.
D)It increases.
12.
Where does Las Vegas get most of its power?
A)nuclear power
B)Hoover Dam
C)coal
D)the Sun
13.
As voltage increases, what happens to current?
A)It increases.
B)It decreases.
C)It stays the same.
D)It fluctuates randomly.
14.
An atom has lost an electron to have a charge of +1. It is now __________.
A)an electron
B)an ion
C)a neutron
D)a proton
15.
Electrons have what charge?
A)neutral
B)negative
C)positive
D)positive and negative
16.
A long, thin wire has __________ than a short, thick wire.
A)lesser voltage
B)greater resistance
C)lesser resistance
D)greater voltage
17.
What do you feel when you receive an electric shock?
A)resistance
B)voltage
C)current
D)power
18.
How do insulators and conductors differ?
A)Insulators do not allow electrons to pass through them easily.
B)Conductors allow protons to pass through them.
C)Insulators allow protons to pass through them.
D)Conductors do not allow an electric current through them.
19.
What flows in an electric circuit?
A)electrons
B)neutrons
C)ions
D)protons
20.
If an atom gains an electron, what is its charge?
A)neutral
B)negative
C)positive
D)positive and negative
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