Grade 9 Academic Science – Electricity Quiz #1

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Grade 9 Academic Science – Electricity Quiz #1
Which of the following statements is NOT part of the
Law of Electric Charges?
1.
2.
3.
4.
Objects with opposite charges are attracted to each
other
More than two objects can have charges that attract
Objects with like charges repel each other
None of the above
Grade 9 Academic Science – Electricity Quiz #1
In order that the atom has a neutral charge, what is the
proper configuration of the sub-atomic particles of
the atom?
1.
2.
3.
4.
Number of neutrons = Number of electrons
Number of neutrons = Number of protons
Number of protons = Number of electrons
Number of protons + Number of neutrons = Number
of electrons
Grade 9 Academic Science – Electricity Quiz #1
What is “Charging of an object by contact with
a CHARGED object?”
1.
2.
3.
4.
Charging by Conduction
Charging by Friction
Charging by Grounding
Charging by Induction
Grade 9 Academic Science – Electricity Quiz #1
Copper is a good conductor. A
conductor is a material that allows
electrons to move through it easily.
1. True
2. False
3. Maybe
Grade 9 Academic Science – Electricity Quiz #1
Which subatomic particles of an
atom move most easily from
one material to another?
1.
2.
3.
4.
Electrons
Neutrons
Protons
None – No subatomic particles
move
Grade 9 Academic Science – Electricity Quiz #1
When Charging by Induction, the
charged object must be
touching the neutral object?
1.
2.
3.
4.
True
False
Some of the time
Only if you want the charge to
be temporary
Grade 9 Academic Science – Electricity Quiz #1
In the triboelectric series, wool has a greater
potential to give electrons than copper. If
wool and copper are rubbed together, what
charge will occur by friction on the wool?
1.
2.
3.
4.
A negative charge
A neutral charge (i.e., electrons will balance
out)
A positive charge
None of the above
Grade 9 Academic Science – Electricity Quiz #1
What is “…removing an excess charge
by transferring electrons between
an object and a large neutral
object?”
1.
2.
3.
4.
Electric current
Electric charge
Grounding
Insulating
Grade 9 Academic Science – Electricity Quiz #1
What is an electric charge?
1.
2.
3.
4.
A form of charge, either positive or negative, that
exerts an electric force
An imbalance of electric charge on the surface of an
object
An object that has equal number of protons and
electrons
A shift in the position of the electrons in a neutral
object that occurs when a charged object is brought
near it
Grade 9 Academic Science – Electricity Quiz #1
A negatively-charged balloon is brought near a neutral
conducting sphere as shown below. As it
approaches, charge within the sphere will distribute
itself in a very specific manner. Which one of the
diagrams below properly depicts the distribution of
charge in the sphere?
Grade 9 Academic Science – Electricity Quiz #1
You want to PERMANENTLY charge the
hanging ball in the picture. If you are
charging by Induction, how do you
ensure the ball will retain a charge
permanently?
1.
2.
3.
4.
Keep the rod touching the ball
permanently
Add a positive charge to the rod so
both objects become neutral
Ground the ball so the electrons in the
ball are pulled away leaving a positive
charge
Hope and pray it happens
Grade 9 Academic Science – Electricity Quiz #1
A conducting sphere is charged positively by some method. The
charge is initially deposited on the left side of the sphere.
Since the object is conductive, the charge spreads uniformly
throughout the surface of the sphere. What explains the
uniform distribution of the charge?
1.
2.
3.
4.
5.
The charged atoms at the location of charge move throughout
the surface of the sphere
The excess protons move from the location of charge to the
rest of the sphere
Excess electrons from the rest of the sphere are attracted
towards the excess protons
Okay, this just became impossible
None of the above
Grade 9 Academic Science – Electricity Quiz #1
The transfer of electrons between two
neutral objects (…made of different
materials…) that occurs when they
are needed rubbed together or come
in conduct (touch)?
1.
2.
3.
4.
Charging by friction
Charging by induction
Charging by electric discharge
Charging by creating a h#@* of a
mess
Grade 9 Academic Science – Electricity Quiz #1
What is static electricity?
1.
2.
3.
4.
Imbalance of electric charge
on the surface of an object
An object that has electrons
A form of charge exerting a
force
A force of repulsion or
attraction
Grade 9 Academic Science – Electricity Quiz #1
Two neutral conducting pop cans are touching
each other. A negatively-charged balloon
is brought near Can X. As the balloon
approaches Can X, there is a movement
of electrons between the balloon and Can
X (in one direction or the other). In which
direction do the electrons in Can X move?
•
•
•
•
Toward the balloon
Into Can Y
The movement is actually electrons from
Can Y to Can X
Into the balloon

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