AnswersCR - LCISD - Physics BUnit Test

Unit Test — Unit test Answers

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1
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The diagram shows the electric field in the vicinity of a charge.

Question illustration
A
W
B
X
C
Y
D
Z
2
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Which pair does NOT have an electric force between them?

A
a positive object and negative object
B
two positive objects
C
two neutral objects
D
two negative objects
3

Jonas sees this symbol in a circuit diagram.

Question illustration
A
resistor
B
bulb
C
battery
D
voltmeter
5

What do transformers do in the generation and distribution of electrical energy? Check all that apply.decrease voltageconvert water into steamincrease voltageturn turbinesturn generators

A
decrease voltage
B
convert water into steam
C
increase voltage
D
turn turbines
E
turn generators
6

A charge of 6.4 × 10–7 C experiences an electric force of 1.8 × 10–1 N. What is the electric field strength?

A
1.1 × 10–7 N/C
B
3.6 × 10–6 N/C
C
8.2 × 100 N/C
D
2.8 × 105 N/C
7

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
8

Question text not available

Answer not available
9

Which best describes the materials that make up an electrical cord?

A
a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons
B
a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons
C
a metallic insulator with free electrons surrounded by a rubber conductor lacking free electrons
D
a metallic insulator lacking free electrons surrounded by a rubber conductor with free electrons
10

Kiki makes a table to compare the particles in a magnesium atom to those in a magnesium ion.She knows that a magnesium ion has an electric field that points away from the ion. What values should she use to complete her table?

Question illustration
A
X: 14Y: 12Z: 12
B
X: 12Y: 12Z: 10
C
X: 12Y: 10Z: 12
D
X: 12Y: 12Z: 14
11

A circuit is built based on the circuit diagram shown.

Question illustration
A
1.2 A
B
1.5 A
C
2.0 A
D
4.6 A
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

Which statement best describes a device that has a high energy efficiency?

A
Its ratio of energy absorbed to energy released is high.
B
Its ratio of energy input to energy output is high.
C
It wastes little energy.
D
It wastes a lot of energy.
14

Marta, Cato, and Juan plan a skit to illustrate one of the methods of charging.Marta and Cato are walking together. Each has one flower and one box of candy. Juan offers Cato a huge bouquet of flowers, but Cato can’t take it because his hands are full.Cato hands his flower to Marta and then turns to Juan to take the bouquet.Marta walks away in one direction with two flowers and one box of candy. Juan keeps the bouquet and walks away in the other direction. Cato looks sad standing alone with only a box of candy.

A
It models induction because an electron (a flower) transfers from Cato to Marta through direct contact.
B
It models friction because an electron (a flower) transfers from Cato to Marta through direct contact.
C
It models friction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.
D
It models induction because the offer of flowers represents a charged object that causes an electron (a flower) to transfer from one object to another.
15

A positive rod is placed to the left of sphere A, and the spheres are separated.

Question illustration
A
Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.
B
Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.
C
Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A.
D
Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.
16

Both the electrical force and the gravitational force between two objects share which relationship?

A
They are directly proportional to mass.
B
They are inversely proportional to the square of the distance.
C
They are inversely proportional to charge.
D
They are directly proportional to the square of the distance.
17

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.
18

A series circuit contains a 30 Ω resistor, a 20 Ω resistor, and a 10 Ω resistor. The power supply provides 100 V to the circuit.The current in the 10 Ω resistor, to two significant figures, is A.

Answer not available
19

The table lists the mass and charge of a proton and a neutron.How do the gravitational and electrical forces between a proton and a neutron compare?

Question illustration
A
The gravitational force is much smaller than the electrical force for any distance between the particles.
B
The gravitational force is much larger than the electrical force for any distance between the particles.
C
The gravitational force is much smaller than the electrical force for only very small distances between the particles.
D
The gravitational force is much larger than the electrical force for only very small distances between the particles.
20

A charge of +0.08 C moves to the right due to a 4 N force exerted by an electric field. What is the magnitude and direction of the electric field?

A
0.32 N/C left
B
0.32 N/C right
C
50 N/C left
D
50 N/C right
21

Wendy makes a graphic organizer to help herself apply Ohm’s law to electric circuits.Which formulas belong in the regions marked X and Y?

Question illustration
A
X: I = I1 + I2 + I3Y: Req = R1 + R2 + R3
B
X: Req = R1 + R2 + R3Y: I =
Option B
C
X: I = I1 = I2 = I3Y: V = V1 + V2 + V3
D
X: I = Y: V = V1 = V2 = V3
Option D

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