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American System Physics

A Physics Toolkit

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Representing Motion

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Accelerated Motion

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Forces in One Dimension

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Displacement and Force in Two Dimensions

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Motion in Two Dimensions

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Gravitation

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Rotational Motion

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Momentum and Its Conservation

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Energy and Its Conservation

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Thermal Energy

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States of Matter

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Vibrations and Waves

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Sound

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Fundamentals of Light

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Reflection and Refraction

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Interference and Diffraction

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Electrostatics

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Electric Current and Circuits

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Magnetic Fields

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Electromagnetic Induction and Electromagnetism

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Quantum Theory and the Atom

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Solid-State Electronics

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Nuclear and Particle Physics

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Quiz

18.1 Electric Charge and Charging – Quiz

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Electric Charge and Charging American Physics quiz: free practice for American System Physics. Work through this Electric Charge and Charging American Physics quiz and get instant feedback on every answer. If you get stuck, review the 18.1 Electric Charge and Charging — Notes lesson. More practice: American System Physics — all units. Syllabus: OpenStax free science textbooks.

  • Questions count: 50
  • Passing grade: A-
  • Time limit:
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1.
A plastic comb gains 2.5 × 10¹² electrons when pulled through hair. What is the charge on the comb?
-4.0 × 10⁻⁷ C
4.0 × 10⁻⁷ C
-1.6 × 10⁻⁷ C
-4.0 × 10⁻⁶ C
2.
An acetate rod has a charge of +3.2 nC. How many electrons has it lost?
5.1 × 10¹² electrons
2.0 × 10¹⁰ electrons
2.0 × 10¹³ electrons
2.0 × 10⁷ electrons
3.
A current of 0.20 A flows for 15 s. How much charge passes a point?
0.013 C
75 C
3.0 C
180 C
4.
How many electrons pass a point in a wire when a current of 2.0 A flows for 1.0 minute?
1.2 × 10¹⁹ electrons
1.9 × 10²³ electrons
7.5 × 10²¹ electrons
7.5 × 10²⁰ electrons
5.
Two identical metal spheres on insulating stands (see diagram) touch and are then separated. What is the final charge on each?
Dr Dabour Hub Academy - figure 1
+3.0 μC
+5.0 μC
+8.0 μC
−2.0 μC
6.
For the spheres in the diagram, how many electrons move, and in which direction, when they touch?
Dr Dabour Hub Academy - figure 2
3.1 × 10¹³ electrons from X to Y
3.1 × 10¹³ electrons from Y to X
1.9 × 10¹³ electrons from Y to X
Protons move from X to Y
7.
A metal sphere with −9.0 nC touches an identical neutral sphere. What is the final charge on the originally neutral sphere?
−9.0 nC
+4.5 nC
−4.5 nC
0 nC
8.
Which charge in the table cannot be correct?
A (−4.8 × 10⁻¹⁹ C)
D (+8.0 × 10⁻¹⁹ C)
E (−1.6 × 10⁻¹⁸ C)
C (−2.4 × 10⁻¹⁹ C)
9.
Using the table, what happens when a rubbed acetate rod is brought near a suspended rubbed polythene rod?
They repel, because they have like charges
Nothing happens, because they are insulators
They attract, because they have unlike charges
They attract, because both are negative
10.
In the rubbing experiment in the table, why is the polythene rod repeated?
To check the result is repeatable
To increase the charge on the acetate rod
To change the independent variable
Because the first result was an anomaly
11.
From the table, what is the charge on Rod 1?
Positive
Negative
Neutral
Cannot be charged
12.
The leaf did not move at all when Rod 3 approached. What does this tell you?
It is strongly negative
It is strongly positive
It is uncharged (or its charge is too small to detect)
It is a conductor that is positively charged
13.
Which set of entries correctly completes the "Final charge" column of the table, in order?
Equal and opposite on the two materials; same sign as charging object; opposite sign to charging object
Same sign as charging object; equal and opposite; same sign as charging object
Opposite sign; opposite sign; same sign
Neutral; neutral; neutral
14.
The diagram shows stage 2 of charging a sphere by induction. What happens when the earth connection is made?
Dr Dabour Hub Academy - figure 3
Electrons flow from earth into the sphere
Protons flow from the sphere to earth
Electrons flow from the sphere to earth
Nothing flows because the rod is not touching
15.
After stage 2 in the diagram, what is the correct order to finish charging the sphere?
Dr Dabour Hub Academy - figure 4
Remove the rod, then the earth; the sphere is left positive
Remove the earth, then the rod; the sphere is left negative
Touch the rod to the sphere; the sphere is left positive
Remove the earth, then remove the rod; the sphere is left positive
16.
A negatively charged rod is brought near the cap of the uncharged electroscope shown. What happens to the leaf and why?
Dr Dabour Hub Academy - figure 5
It rises, because electrons are repelled down to the rod and leaf, which then repel
It stays still, because the rod does not touch
It rises, because protons move up to the cap
It falls, because the rod attracts the leaf
17.
The diagram shows a negatively charged rod held above pieces of paper. Why is the neutral paper attracted?
Dr Dabour Hub Academy - figure 6
The paper has gained electrons from the rod
The paper is positively charged
The paper is polarized; the nearer positive side is attracted more strongly than the farther negative side is repelled
The rod creates new positive charge in the paper
18.
In the diagram, the suspended rod turns away from the second rod. What is the charge on the second rod?
Dr Dabour Hub Academy - figure 7
Positive
Neutral
It could be neutral or positive
Negative
19.
The graph shows the charge on an object against the number of electrons removed. What is the gradient of the line?
Dr Dabour Hub Academy - figure 8
1.60 × 10⁻¹⁹ C per electron
6.25 × 10¹⁸ electrons per C
9.11 × 10⁻³¹ C per electron
1.0 C per electron
20.
The graph shows charge flowing through a wire against time. What is the current?
Dr Dabour Hub Academy - figure 9
2.5 A
0.40 A
4.0 A
0.040 A
21.
What is the SI unit of electric charge?
ampere (A)
volt (V)
coulomb (C)
newton (N)
22.
Polythene rubbed with wool becomes negative. What happened?
Protons moved from the polythene to the wool
Electrons moved from the polythene to the wool
Negative charge was created by heat
Electrons moved from the wool to the polythene
23.
Why is copper a good electrical conductor?
It has many free (delocalized) electrons that can move
Its protons move easily
It has no electrons
Its atoms are positively charged
24.
A student says, "The paper sticks to the charged rod because the paper is charged." Which correction is best?
The paper gains protons from the rod
The neutral paper is polarized; the nearer opposite charge is attracted more strongly than the farther like charge is repelled
The rod loses all its charge to the paper first
Gravity pulls the paper upwards
25.
Which is a hazard of static electricity?
Even coating in paint spraying
Removing dust in chimneys
Sparks igniting fuel vapour
Making photocopies
26.
Engineers make deliberate, helpful use of electrostatic charge in which of these?
Lightning damage
Shocks from car doors
Damage to electronic circuits
Dust precipitators in chimneys
27.
Which plan would show there are two kinds of charge?
Suspend a rubbed polythene rod; bring near another rubbed polythene rod, then a rubbed acetate rod, and record repulsion or attraction
Rub one rod and measure its mass
Touch two metal rods together in the hand
Heat a rod and watch its colour
28.
Electrostatics experiments often fail on humid days. Why?
Humidity increases the charge
Moist air and surfaces let charge leak away
Water blocks electrons from moving
Humid air creates protons
29.
Why should an electroscope be discharged by touching the cap before each test?
To add more electrons
To heat the leaf
So that the starting charge is zero and results can be compared fairly
To change the rod material
30.
A neutral sphere is charged by induction using a positive rod. What is its final charge?
Positive
Neutral
Double the rod charge
Negative
31.
A student sorts materials into conductors and insulators. Which material is sorted correctly?
Copper — insulator
Rubber — insulator
Plastic — conductor
Silver — insulator
32.
The magnitude of the charge on one electron is e = _____ C.
1.60 × 10⁻¹⁹
9.11 × 10⁻³¹
1.67 × 10⁻²⁷
6.25 × 10¹⁸
33.
An object becomes positively charged when it _____ electrons.
gains
loses
shares
creates
34.
Connecting a charged conductor to the Earth so that it becomes neutral is called _____.
insulating
polarizing
earthing (grounding)
rubbing
35.
An object with 5.0 × 10¹³ extra electrons has a charge of _____ C.
+8.0 × 10⁻⁶
−3.1 × 10³²
−8.0 × 10⁻³²
−8.0 × 10⁻⁶
36.
Two identical spheres with +10 nC and +4 nC touch. Each ends with _____ nC.
+7
+14
+3
+10
37.
Object E in the table has 10 extra electrons. True or false?
True
False, it has lost 10 electrons
False, it has 1 extra electron
True only if E is a conductor
38.
A classmate claims the positive object B became charged by picking up 2 protons. True or false?
True, positive objects gain protons
False, because it has lost 2 electrons
True only if B is an insulator
False, because it has gained 2 electrons
39.
In the table, the wool used on the polythene rod ends up with a positive charge. True or false?
False, it stays neutral
False, it becomes negative too
True only if the wool is wet
True
40.
According to the table, Rod 2 must be positively charged. True or false?
False, it must be negative
False, a neutral rod always makes the leaf fall
True only if Rod 2 is metal
True
41.
The table shows that graphite is a conductor. True or false?
False, only metals are conductors
True
False, graphite is an insulator
True only when wet
42.
In the diagram the electroscope leaf is raised, so the rod and leaf carry opposite charges. True or false?
Dr Dabour Hub Academy - figure 10
True, opposite charges push apart
False, because they carry the same sign and repel
True only if the case is metal
False, because the leaf is uncharged
43.
Rubbing a balloon on hair creates new charge. True or false?
True, friction produces charge
True only for rubber balloons
False, because electrons are only transferred
False, because no charge is involved
44.
In solids, only electrons move during charging; protons stay fixed in nuclei. True or false?
False, protons move to make things positive
False, neutrons carry the charge
True only in insulators
True
45.
A metal rod held in the hand can easily be charged by rubbing. True or false?
False, because charge flows away through the hand to earth
True, metals charge more easily than plastics
True only if rubbed with wool
False, because metals have no electrons
46.
Charging by conduction gives the object the same sign of charge as the charging object. True or false?
False, it gives the opposite sign
True
True only for insulators
False, the object stays neutral
47.
Aircraft are earthed during refuelling to prevent sparks from static charge. True or false?
False, earthing increases the charge
True only in dry weather
True
False, fuel cannot ignite
48.
Electrostatic paint spraying wastes more paint than ordinary spraying. True or false?
True, charged droplets repel the object
True only for metal objects
False, because paint cannot be charged
False, because charged droplets are attracted to the object, giving less waste
49.
The coulomb is the charge that passes a point when 1 A flows for 1 s. True or false?
True
False, it is 1 A for 1 minute
False, it is the charge of one electron
True only in metals
50.
Charge is a vector quantity. True or false?
True, it has direction
False, charge is a scalar
True only for negative charge
False, charge has no unit
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