AnswersCrowley Credit Recovery Physics BUnit Test

Unit Test — Unit test Answers

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1
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How does a rubber rod become negatively charged through friction?

A
It touches a negatively charged object, and protons move off of the rod.
B
It touches a positively charged object, and electrons move onto the rod.
C
It is rubbed with another object, and electrons move onto the rod.
D
It is rubbed with another object, and protons move off of the rod.
2
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Suchita sees this symbol shown in a circuit diagram.

Question illustration
A
to measure current
B
to measure voltage
C
to provide electrical energy
D
to use electrical energy
3

An electric field around two charged objects is shown.

Question illustration
A
X: negativeY: positive
B
X: positiveY: positive
C
X: negativeY: negative
D
X: positiveY: negative
4

In a movie, the heroine saves the day by cutting a wire before the time runs out on a timer.

A
She changed a short circuit to an open circuit.
B
She changed an open circuit to a closed circuit.
C
She changed a closed circuit to an open circuit.
D
She changed a closed circuit to a short circuit.
5

The area around a charged object that can exert a force on other charged objects is a(n) _________.

A
electric field
B
field line
C
conductor
D
electric potential energy
6

A circuit has a resistance of 2.5 Ω and is powered by a 12.0 V battery. The current in the circuit, to the nearest tenth, is A.

Answer not available
7

How does the electrical force relate to the distance between two charged objects?

A
It is inversely proportional to the square of the distance.
B
It is directly proportional to the square of the distance.
C
It is inversely proportional to the distance.
D
It is directly proportional to the distance.
8

Which statements about electric field lines are correct? Check all that apply.

A
They point toward a positive charge.
B
They point toward a negative charge.
C
They point away from a positive charge.
D
They point away from a negative charge.
E
They cross over one another between charges.
F
They never cross.
9

The diagram shows the electric field in the vicinity of a charge.

Question illustration
A
W
B
X
C
Y
D
Z
10

Which equation relates charge, time, and current?

A
I equals delta q over t
Option A
B
I equals t over delta q.
Option B
C
Option
Option C
D
Option
Option D
11

Which statements are correct? Check all that apply.

A
Charge Q is positive.
B
Charge Q is negative.
C
The electric field is uniform.
D
The electric field is nonuniform.
E
If charge A is negative, it moves away from charge Q.
F
If charge A is positive, it moves away from charge Q.
12

After hearing about an accident on his normal route, Mr. Gujral checks for alternate routes to get to work.

A
a series circuit because there is more than one path
B
a series circuit because there is only one path
C
a parallel circuit because there is more than one path
D
a parallel circuit because there is only one path
13

A circuit carries a current of 0.64 A when there is a resistance of 50.0 Ω. The voltage applied to the circuit, to the nearest whole number, is V.

Answer not available
14

A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge? (Use k=)

Question illustration
A
2.2 µC
B
680 µC
C
2.2 C
D
680 C
15

Jason sees a news report about a traffic jam caused by a truckload of tires that spilled across the road. The next day in class, he uses the traffic jam as an analogy to explain electric circuits to his friend.Which is most likely the analogy that Jason used?

A
The cars represent moving charges, and the spilled tires represent an increased voltage that causes the current to decrease.
B
The cars represent moving charges, and the spilled tires represent an increased resistance that causes the current to decrease.
C
The tires represent moving charges, and the cars represent an increased resistance that causes the current to decrease.
D
The tires represent moving charges, and the cars represent an increased voltage that causes the current to decrease.
16

The strength of the electric field 0.5 m from a 6 µC charge is _______ N/C. (Use k = 8.99 × 109 N• and round answer to the nearest whole number.)

Question illustration
A
215760
B
539400
C
697976
D
512356
17

Which changes would cause an increase in the resistance of a wire? Check all that apply.increasing its temperaturedecreasing its temperatureusing a longer wireusing a shorter wireusing a thicker wireusing a thinner wire

A
increasing its temperature
B
decreasing its temperature
C
using a longer wire
D
using a shorter wire
E
using a thicker wire
F
using a thinner wire
18

A pair of opposite electric charges of equal magnitude is called a(n)

A
dipole.
B
point charge.
C
electric field.
D
field line.
20

A wire delivers 12.0 C of charge in 4.0 s.What is the current in the wire?

A
3.0 A
B
8.0 A
C
16 A
D
48 A
21

A positive charge, q1, of 5 µC is 3 × 10–2 m west of a positive charge, q2, of 2 µC. What is the magnitude and direction of the electrical force, Fe, applied by q1 on q2?

A
magnitude: 3 Ndirection: east
B
magnitude: 3 Ndirection: west
C
magnitude: 100 Ndirection: east
D
magnitude: 100 Ndirection: west

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