AnswersPhysicsElectricity

Practice Test Answers

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1
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If the distance between two charges is increased to three times the original distance, how will the electrical force between the charges compare with the original force?

A
It will decrease to one-ninth the original force.
B
It will increase to nine times the original force.
C
It will increase to three times the original force.
D
It will decrease to one-third the original force.
2
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Which is a dopant for a semiconductor that conducts electricity due to the movement of electrons?

A
antimony
B
thallium
C
boron
D
indium
3

Which material is used as a dielectric?

A
gold
B
glass
C
copper
D
silver
4

Which current delivered more charge, and how much more charge did it deliver? Current X is 2 point 5 cap A and runs for 39 seconds. Current Y is 3 point 8 cap A and runs for 24 seconds.

A
Y delivered 1 point 3 cap c more than X.
B
X delivered 97 point 5 cap c more than Y.
C
Y delivered 91 point 2 cap c more than X.
D
X delivered 6 point 3 cap c more than Y.
5

A negative point charge, q , is placed near a positive charge, cap q The distance between the charges increases as q is moved farther from cap q Which quantity will decrease as q is moved away?

A
electric potential energy
B
electric potential difference
C
electric charge
D
electric potential
6

A power source of 2 point 0 cap v is attached to the ends of a capacitor. The capacitance is 4 point 0 µF What is the amount of charge stored in this capacitor?

A
8 point 0 µC
B
6 point 0 µC
C
2 point 0 µC
D
0 point 5 0 µC
7

A point charge is used to determine the electric field around a charged particle. Why is it necessary that the point charge does not affect the position of the charge being tested?

A
Electric fields are inversely proportional to the square of the distance, so any change in position changes the field.
B
Electric fields are directly proportional to distance, so any change in position changes the field.
C
The amount of charge will decrease if the charged particle moves closer to the point charge, so any change in position changes the field.
D
The amount of charge will increase if the charged particle moves closer to the point charge, so any change in position changes the field.
8

Based on the locations of the elements aluminum Al , silicon Si , and phosphorus (​P​) on the periodic table, which lists the elements in order from the least conductive to the most conductive?

A
Si , Al , cap p
B
Al , Si , cap p
C
cap p , Al , Si
D
cap p , Si , Al
9

Charges of plus 3 µC and negative 5 µC are 2 mm from each other. The negative 5 µC charge is replaced with a plus 5 µC charge. How will the electrical force between the charges compare with the original force?

A
same force, but in the same direction
B
greater force, but in the same direction
C
greater force, but in the opposite direction
D
same force, but in the opposite direction
10

What are used to transfer electrical energy from a power plant all the way to a home?

A
turbines
B
power lines
C
power transformers
D
generators
11

Which label belongs in the region marked X?

A
Electrons move
B
Protons move
C
Charged object must touch
D
Charged object must not touch
12

Which labels belong in regions X, Y, and Z?

A
X: Points away from the charge Y: Points in the direction of the force on the negative charge Z: Points toward the charge
B
X: Points toward the charge Y: Points in the direction of the force on the negative charge Z: Points away from the charge
C
X: Points away from the charge Y: Points in the direction of the force on the positive charge Z: Points toward the charge
D
X: Points toward the charge Y: Points in the direction of the force on the positive charge Z: Points away from the charge
13

Which labels belong in the regions marked X and Y?

A
X: Boils water to form steam Y: Uses turbines to turn generators
B
X: Uses generators to produce electrical energy Y: Burns fuel to form steam
C
X: Uses turbines to turn generators Y: Boils water to form steam
D
X: Uses uranium Y: Uses falling water to turn turbines
14

Janelle is exploring the relationship between the brightness of a light bulb and the current that powers it. When applying these currents to the same bulb, the bulb is brighter when the current is greater. Which lists the currents in the order of the bulb brightness they cause from most bright to least bright?

A
W, Y, X, Z
B
W, Y, Z, X
C
Y, W, Z, X
D
X, Z, W, Y
15

Which basic feature is missing from the circuit?

A
conducting wires
B
a switch
C
an energy source
D
a device that uses energy
16

Which change will correct the error on her note card?

A
moving point (2) into the Advantages column
B
moving point (4) into the Advantages column
C
adding the title Parallel Circuits
D
switching the headings on the columns
17

How can the negative charge be moved in order to cause both charges to have the same change in electric potential energy?

A
It can be moved 0 point 0 4 m toward the positive plate.
B
It can be moved 0 point 0 4 m toward the negative plate.
C
It can be moved 0 point 0 1 m toward the negative plate.
D
It can be moved 0 point 0 1 m toward the positive plate.
18

What are the correct labels for the image?

A
W: Negative X: Negative
B
W: Negative X: Positive
C
W: Positive X: Positive
D
W: Positive X: Negative

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