WorksheetsElectricity and Magnetism
Total questions: 20
Worksheet time: 13mins
Name
Class
Date
1.
A balloon is rubbed all over with wool. The balloon will now attract wool because the balloon and wool
a)
are magnets
b)
have opposite charges
c)
have like charges
d)
have neutral charges
2.
In a static discharge, which particles move from one object to another?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
3.
Which of the following could be used as the core of a simple electromagnet?
a)
drinking straw
b)
iron nail
c)
a soda bottle
d)
an ink pen
4.
A piece of nickel will be attracted to
a)
only the north pole of an electromagnet
b)
only the south pole of an electromagnet
c)
either pole of an electromagnet
d)
the iron core of an electromagnet
5.
What is voltage?
a)
a measure of electric current
b)
a kind of static elecricity
c)
a kind of current electricity
d)
a measure of potential energy difference
6.
Which of these in an insulator?
a)
a copper wire
b)
a silver spoon
c)
a plastic coating on a wire
d)
an aluminum coating on a wire
7.
What is the purpose of a switch in an electric circuit?
a)
to allow the circuit to be opened or closed
b)
to change the direction of the current
c)
to provide a push for the current
d)
to increase the electric power to the load
8.
What is the purpose of an electric motor?
a)
to convert electrical energy to mechanical energy
b)
to convert chemical energy to electrical energy
c)
to convert mechanical energy to electrical energy
d)
to convert mechanical energy to heat energy
9.
Which of these is NOT a function of a diode?
a)
to turn current on
b)
to turn current off
c)
to block the flow of current in the wrong direction
d)
to adjust the amount of current that flows
10.
Electric current flowing through a wire produces
a)
static electricity
b)
an open circuit
c)
a permanent magnet
d)
a magnetic field
11.
What is the purpose of an iron core in an electromagnet?
a)
to hold the loops of wire in place
b)
to make the magnetic force stronger
c)
to change the direction of the electric current
d)
to change the direction of the magnetic force
12.
Each time a lightbulb is added to a series circuit, the other bulbs in the circuit
a)
get brighter
b)
get dimmer
c)
stay the same brightness
d)
release more heat
13.
A group of lights are connected in a parallel circuit. One of the lights is removed. The rest of the lights will
a)
get brighter
b)
get dimmer
c)
go out
d)
not change
14.
A scientist observed that the needle of a compass moved when it was placed near a wire carrying an electric current. What did this observation show?
a)
Opposite charges attract.
b)
Electric current generates a magnetic field.
c)
Magnetized wires generate electricity.
d)
Like charges repel.
15.
Two lightbulbs are connected to an energy source by two loops. What is this setup an example of?
a)
a parallel circuit
b)
a static discharge
c)
a series circuit
d)
an electromagnet
16.
When a switch connects two parts of a circuit, the circuit is
a)
series
b)
parallel
c)
open
d)
closed
17.
A string of lights is lit. They are part of a series circuit. One of the bulbs is removed. The rest of the lights will
a)
go out
b)
stay lit
c)
get brighter
d)
get dimmer
18.
Which of the following is a semiconductor?
a)
silver
b)
gold
c)
silicon
d)
plastic
19.
What is the purpose of a generator?
a)
to convert electrical energy to mechanical energy
b)
to convert chemical energy to electrical energy
c)
to convert mechanical energy to electrical energy
d)
to convert mechanical energy to heat energy
20.
A student is investigating how changing the size of the core of an electromagnet affects its strength. Which of these is most likely the dependent variable in the student's investigation?
a)
the number of wire coils wrapped around the core
b)
the number of paper clips picked up by the electromagnet
c)
the voltage of the battery used in the circuit
d)
the size of the piece of iron used as the core
100 %
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