Answers3262 CR Physics B 2526Unit Test

Unit Test — Cumulative exam Answers

25 verified answers3 views
1
Free Preview

A force of 1.5 × 102 N is exerted on a charge of 1.4 × 10–7 C that is traveling at an angle of 75° to a magnetic field.

A
8.2 × 102 T
B
8.5 × 102 T
C
3.2 × 103 T
D
6.4 × 1010 T
2
Free Preview

Which type of circuit is a continuous loop that allows the flow of current along its intended path?

A
open
B
inverted
C
closed
D
short
3

What is the main difference between a longitudinal wave and a transverse wave?

A
A longitudinal wave always travels faster than a transverse wave.
B
A longitudinal wave does not need a medium to travel through.
C
A transverse wave is made of particles that move perpendicular to the motion of the wave.
D
A transverse wave always carries more energy so that it can travel through empty space.
4

A Hertzsprung-Russel diagram is shown.

Question illustration
A
red giants
B
white dwarfs
C
supergiants
D
main sequence
5

mass-energy equivalencemass defectbinding energymass-energy conservation

A
mass-energy equivalence
B
mass defect
C
binding energy
D
mass-energy conservation
6

Which best describes fusion nuclear reactors?

A
They use rods containing uranium for fuel.
B
They are currently used for electricity in several highly populated countries.
C
They are used in some naval vessels, such as submarines.
D
They have been successful, but they are very expensive to operate.
7

Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions.

Question illustration
A
X: Smaller nuclei formY: Thermal energy is producedZ: A larger nucleus forms
B
X: Large amounts of energy are releasedY: One or more neutrons is releasedZ: Smaller nuclei form
C
X: One or more neutrons is releasedY: A larger nucleus formsZ: Large amounts of energy are released
D
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei form
8

A charged particle moves at 2.5 × 104 m/s at an angle of 25° to a magnetic field that has a field strength of 8.1 × 10–2 T.

A
3.7 × 10–5 C
B
4.1 × 10–5 C
C
8.8 × 10–5 C
D
1.0 × 10–4 C
9

How does charging by conduction compare with charging by induction?

A
A charged object is needed in conduction but not in induction.
B
Two neutral objects are needed in conduction but not in induction.
C
Objects must touch in induction but not in conduction.
D
Oppositely charged objects form in induction but not in conduction.
10

Which device converts kinetic energy into electrical energy?

A
an electric generator
B
an electric motor
C
a step-down transformer
D
a step-up transformer
11

A series circuit contains three 2 Ω resistors and a 6 Ω resistor. The current in each resistor is 4.0 A.

A
2.0 V
B
3.0 V
C
32 V
D
48 V
12

The table lists the values of the constants used to calculate the electrical force and the gravitational force.

Question illustration
A
The electrical force is much smaller than the gravitational force because 8.99 is much greater than 6.67.
B
The electrical force is much larger than the gravitational force because 8.99 is much greater than 6.67.
C
The electrical force is much smaller than the gravitational force because 109 is much greater than 10–11.
D
The electrical force is much larger than the gravitational force because 109 is much greater than 10–11.
13

Jasmine makes a note card about series circuits. She records the points shown.Which change will correct the error on her note card?

Question illustration
A
switching the headings on the columns
B
adding the title Parallel Circuits
C
moving point (2) into the Advantages column
D
moving point (4) into the Advantages column
14

Which change can make a generator stronger?

A
decreasing the size of the slip rings
B
increasing the size of the slip rings
C
decreasing the number of coils in the armature
D
increasing the number of coils in the armature
15

The table below shows the speed of sound waves from musical sound sources at 20°C.Which conclusion can be made based on the information in the table?

Question illustration
A
Wave speed and wavelengths can vary inversely to produce the same frequency.
B
Frequency and wave speed can vary directly to produce the same wavelength.
C
Wavelengths and frequency can vary inversely to produce the same wave speed.
D
Frequency and wavelengths can vary directly to produce the same wave speed.
16

Which statement describes why energy is released in a nuclear fission reaction based on mass-energy equivalence?

A
For large nuclei, the mass of the original nucleus is greater than the mass of the products.
B
For large nuclei, the mass of the original nucleus is less than the mass of the products.
C
For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.
D
For small nuclei, the binding energy of the lighter nuclei is less than the binding energy of the heavier nucleus.
17

What best explains why a person can become sunburned by spending too much time at the beach?

A
Sunlight is an electromagnetic wave that gains energy as it travels through air to reach the person.
B
Sunlight is an electromagnetic wave carrying energy that is absorbed by the skin.
C
Sunlight is a mechanical wave that vibrates the skin particles to produce heat.
D
Sunlight is a mechanical wave, and its frequency matches the natural frequency of skin to make heat.
18

What best describes white light as it travels through a prism? Check all that apply.

A
The light slows down.
B
The light bends in the prism.
C
Light reflects off of the surface of the prism.
D
The speed of light in the prism is 3.0 × 108 m/s.
E
The white light breaks into its component colors.
19

Which statements describe the use of gamma rays to treat cancer? Check all that apply.Gamma rays have low energy and a source must be placed in the body.Gamma rays are absorbed by only the cancer cells.High-energy gamma rays are directed at a tumor from outside of the body.Gamma rays kill cancer cells in a tumor.Gamma rays are applied to a large area of the body.

A
Gamma rays have low energy and a source must be placed in the body.
B
Gamma rays are absorbed by only the cancer cells.
C
High-energy gamma rays are directed at a tumor from outside of the body.
D
Gamma rays kill cancer cells in a tumor.
E
Gamma rays are applied to a large area of the body.
20

Charges of +3 µC and –5 µC are 2 mm from each other. The –5 µC charge is replaced with a +5 µC charge.

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

Did you find these answers helpful?

More from this Course

Quiz
24 verified answers

Unit Test

Quiz
25 verified answers

Unit Test

Quiz
10 verified answers

Magnetic Field and Force