AnswersCrowley Credit Recovery Physics BUnit Test

Unit Test — Cumulative exam Answers

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Which factors affect the strength of a magnetic field around a current-carrying wire? Check all that apply.

A
the type of metal of the wire
B
the amount of the current
C
the direction of the current
D
the temperature of the wire
E
the distance from the wire
22
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Which shows the correct order of events after the big bang occurred?

A
strong force separated from the unified force, inflationary expansion occurred, quarks and electrons formed, electromagnetic and weak forces separated from the unified force, gravity separated from the unified force
B
electromagnetic and weak forces separated from the unified force, gravity separated from the unified force, strong force separated from the unified force, inflationary expansion occurred, quarks and electrons formed
C
gravity separated from the unified force, strong force separated from the unified force, inflationary expansion occurred, electromagnetic and weak forces separated from the unified force, quarks and electrons formed
D
quarks and electrons formed, electromagnetic and weak forces separated from the unified force, inflationary expansion occurred, strong force separated from the unified force, gravity separated from the unified force
23

Which shows the correct order of processes leading up to the formation of a main sequence star?

A
Gases condense to form a nebula, gravity causes the nebula to collapse and spin, nuclear fusion occurs, and a protostar forms.
B
A protostar forms, nuclear fusion occurs, gases condense to form a nebula, and gravity causes the nebula to collapse and spin.
C
Gases condense to form a nebula, gravity causes the nebula to collapse and spin, a protostar forms, and nuclear fusion occurs.
D
A protostar forms, gases condense to form a nebula, gravity causes the nebula to collapse and spin, and nuclear fusion occurs.
24

The wave shown below is produced in a rope.Which shows the motion of the rope at Point P as the wave passes through it?

Question illustration
A
A dot with a vector drawn right and a vector drawn left.
Option A
B
A dot vector drawn up and vector drawn down.
Option B
C
A dot with a vector drawn up to the right and a vector drawn down to the left.
Option C
D
A dot with a vector drawn up to the left and a vector drawn down to the right.
Option D
25

Force F acts between two charges, q1 and q2, separated by a distance d.

A
F
Option A
B
F
Option B
C
F
D
2F
26

Aluminum has a frequency threshold of 9.846 × 1014 Hz. Which best explains what will happen when light with a frequency below the frequency threshold strikes aluminum?

A
Electrons will be ejected immediately.
B
No electrons will be ejected.
C
Electrons will start being ejected several seconds after the light strikes the aluminum.
D
No electrons will be ejected unless the intensity is very high.
27

Emissions from alpha decay require the least amount of shielding.Which best describes why the emissions from alpha decay are so easily blocked compared to the emissions of other types of radioactive decay?

A
Alpha decay releases visible light, which has less energy than the light released during gamma decay.
B
Alpha decay releases particles that have less mass and charge than the particles released during beta decay.
C
Alpha decay releases particles that have less mass and charge than the particles released during gamma decay.
D
Alpha decay releases particles that have more mass and charge than the particles released during beta decay.
28

Which fields would most likely make use of spectroscopy techniques? Select 4 options.

A
food production
B
medical research
C
scientific research
D
space research
E
weather forecasting
29

Which describes Einstein’s second postulate about the special theory of relativity?

A
The speed of light in a vacuum is constant, and nothing is faster than the speed of light.
B
The speed of light in a vacuum is constant, and some things are faster than the speed of light.
C
The speed of light in a vacuum fluctuates, but nothing is faster than the speed of light.
D
The speed of light in a vacuum fluctuates, and some things are faster than the speed of light.
31

What is the best description of a wave?

A
a pulse that carries energy
B
a disturbance that moves matter
C
a medium disturbed by a vibration
D
matter that is moved from one place to another
32

A circuit is built based on this circuit diagram.

Question illustration
A
0.61 Ω
B
1.6 Ω
C
7.5 Ω
D
18 Ω
33

A current of 1.8 A delivers 2.5 C of charge.How much time was required?

A
0.70 s
B
0.72 s
C
1.4 s
D
4.5 s
34

The speed of light in a vacuum is approximately 2.99 × 108 m/s, and the speed of light through a piece of glass is approximately 1.97 × 108 m/s.

A
0.66
B
1.52
C
1.02 × 108
D
4.96 × 108
36

A wave has a wavelength of 3.3 m and a speed of 5.6 m/s. What is the frequency of this wave?

A
0.59 Hz
B
1.7 Hz
C
3.4 Hz
D
18 Hz
37

The diagram shows the electric field around two charged objects.

Question illustration
A
Y is negative, and Z is positive.
B
Y is negative, and Z is negative.
C
Y and Z are like charges, but their identities cannot be determined.
D
Y and Z are opposite charges, but their identities cannot be determined.
38

What is the resistance in a circuit that carries a 0.75 A current when powered by a 1.5 V battery?

A
0.50 Ω
B
1.1 Ω
C
2.0 Ω
D
2.3 Ω
39

Which are characteristics of a ray when it hits a boundary and reflects, but not when it hits the boundary and refracts? Check all that apply.

A
changes direction
B
changes speed
C
does not change direction
D
does not change speed
E
bounces off the boundary
F
passes through the boundary
40

The ratio of coils of wire in the primary winding to the secondary winding of a transformer is 3:2. How does the transformer change the voltage of a current applied to the primary winding?

A
It increases to three-halves times the original.
B
It decreases to two-thirds the original.
C
It increases to three times the original.
D
It decreases to one-third the original.
41

Once started, why can nuclear fission continue to occur on its own?

A
The thermal energy released can cause the products to join.
B
The neutron formed by the reaction can cause more nuclei to combine.
C
The thermal energy released can cause the products to split.
D
A neutron begins the reaction, and more neutrons are formed in it.
42

A positive rod is touched to a neutral sphere.

Question illustration
A
It is showing the direction that protons move in, making the sphere negative.
B
It is showing the direction that protons move in, making the sphere positive.
C
It is showing the direction that electrons move in, making the sphere positive.
D
It is showing the direction that electrons move in, making the sphere negative.

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