Science TESTSSSS
potential energy/charge =
Correct answer:
voltage
Results for question 2.
2
1 / 1 point
Electricity is the flow of
neutrons
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Correct answer:
electrons
protons
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Results for question 3.
3
1 / 1 point
All electrons have the same charge.
Correct answer:
True
False
Results for question 4.
4
1 / 1 point
Two wires are made up of the same material and are the same length. One is twice as thick as the other. Which has less resistance?
Correct answer:
thicker wire
thinner wire
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neither; their resistance is the same
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Results for question 5.
5
1 / 1 point
Just as energy cannot be created or destroyed, electric charge also cannot be created or destroyed.
Correct answer:
True
False
Results for question 6.
6
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The unit of charge is the
Correct answer:
Coulomb
.
Results for question 7.
7
0 / 1 point
The negatively charged part of the atom is the
proton
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electron
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Incorrect answer:
neutron
Correct Answer:
electron
Results for question 8.
8
1 / 1 point
The flow of electric charge that transports energy from one place to another is
Correct answer:
electric current
.
Results for question 9.
9
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The property of a material that prevents the flow of charged particles through it is
Correct answer:
electrical resistance
.
Results for question 10.
10
1 / 1 point
Electrical resistance is measured in a unit called an ohm.
Correct answer:
True
False
Results for question 11.
11
1 / 1 point
Electrons do not flow in a wire when a difference in "electrical pressure" exists.
True
Correct answer:
False
Results for question 12.
12
1 / 1 point
The positively charged part of the atom is the
electron
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neutron
, Not Selected
Correct answer:
proton
Results for question 13.
13
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An atom with a charge is called a/an
Correct answer:
ion
.
Results for question 14.
14
1 / 1 point
Which make(s) up the nucleus of an atom?
Correct answer:
protons
Correct answer:
neutrons
Answer,
electrons
Results for question 15.
15
0 / 1 point
The gravitational force of an object is stronger than its electrical force.
Incorrect answer:
True
Correct Answer:False
False
Results for question 16.
16
1 / 1 point
Like charges attract one another.
True
Correct answer:
False
Results for question 17.
17
1 / 1 point
The length of a wire does not contribute to its resistance.
True
Correct answer:
False
Results for question 18.
18
0 / 1 point
The rate of electrical flow is measured in the
Incorrect answer:
voltage
Correct Answer:ampere
.
Results for question 19.
19
1 / 1 point
Unlike charges repel one another.
True
Correct answer:
False
Results for question 20.
20
1 / 1 point
Correct answer:
Coulomb's law
states that electrical force between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Results for question 21.
21
1 / 1 point
The amount of current in a circuit is directly proportional to the voltage across the circuit and inversely proportional to the resistance of the circuit. This is
Correct answer:
Ohm's Law
.
Results for question 22.
22
1 / 1 point
A circuit in which electrical devices are connected so that the same electric current exists in all of them is a
Correct answer:
series circuit
.
Results for question 23.
23
1 / 1 point
Correct answer:
Alternating current
is electrically charged particles that repeatedly reverse direction, vibrating in relatively fixed positions in a circuit.
Results for question 24.
24
1 / 1 point
In a
Correct answer:
parallel circuit
, electrical devices are connected so that the same voltage acts across each one and any single one completes the circuit independently of all the others.
Results for question 25.
25
1 / 1 point
In
Correct answer:
direct current
, electrically charged particles flow in one direction only.
Results for question 26.
26
1 / 1 point
The rate of energy transfer or rate of doing electric work is
Correct answer:
electric power
.
Results for question 27.
27
1 / 1 point
current =
charge x Coulombs
, Not Selected
power x voltage
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resistance / power
, Not Selected
Correct answer:
voltage / resistance
Results for question 28.
28
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At 200 Ω, how much current will flow through an object if it touches the terminals of a 12-V battery?
Correct answer:
0.06 A
16.67 A
, Not Selected
2,400 A
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Not enough information is given to solve.
, Not Selected
Results for question 29.
29
1 / 1 point
For there to be a flow of electrons, there must be a difference in
current.
, Not Selected
Correct answer:
voltage.
parallel vs. series.
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flavor.
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Results for question 30.
30
1 / 1 point
"Electrical pressure" is a way to say
alternating current.
, Not Selected
Correct answer:
voltage.
direct current.
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current.
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Results for question 31.
31
1 / 1 point
amps x volts =
Ohms
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Coulombs
, Not Selected
Correct answer:
watts
shocks
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Results for question 32.
32
1 / 1 point
If a break occurs anywhere in a series circuit with three lightbulbs, all the lightbulbs go out.
Correct answer:
True
False
Results for question 33.
33
1 / 1 point
If a break occurs anywhere in a parallel circuit with three lightbulbs, all the lightbulbs go out.
True
Correct answer:
False
Results for question 34.
34
1 / 1 point
As more lamps are connected to a series circuit, the overall current in the power source decreases.
Correct answer:
True
False
Results for question 35.
35
1 / 1 point
Household circuits are normally wired in series to decrease the risk of overload.
True
Correct answer:
False
Results for question 36.
36
1 / 1 point
If you add more branches to a parallel circuit, the overall resistance of the circuit decreases.
Correct answer:
True
False
Results for question 37.
37
1 / 1 point
Overloading in a parallel circuit can occur when too many branches are added, which decreases the overall resistance of the circuit.
Correct answer:
True
False
Results for question 38.
38
1 / 1 point
Fuses and circuit breakers can be used to prevent a circuit overload.
Correct answer:
True
False
Results for question 39.
39
1 / 1 point
When voltage across a circuit is tripled, the current in the wire also triples.
Correct answer:
True
False
Results for question 40.
40
1 / 1 point
When resistance of a circuit is tripled, the current in the wire also triples.
True
Correct answer:
False
Results for question 41.
41
1 / 1 point
When a battery is connected in a closed circuit, more current flows out of it than into it.
True
Correct answer:
False
Results for question 42.
42
1 / 1 point
Why don't birds get electrocuted when they sit on power lines?
The pole connects the wires to the ground, so current flows through the birds into the pole.
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Correct answer:
The birds are not grounded; there is no difference in voltage for the current to flow.
The birds' feet are made of a special substance that makes it impossible for electricity to flow through them.
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The birds do get electrocuted