AnswersFL-2003310-Physical ScienceUnit Test

Unit Test — Unit test Answers

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Which best defines energy?

A
a type of wave that carries energy through space, where there is almost no matter
B
a disturbance that carries energy form one place to another through matter and space
C
the ability to do work
D
pressing to make more compact
2
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Kyle has a mass of 54 kg and is jogging at a velocity of 3 m/s. What is Kyle’s kinetic energy? (Formula: )

Question illustration
A
18 J
B
81 J
C
162 J
D
243 J
3

The total energy in a system is 675 J. The kinetic energy changes from 296 J to 432 J. Which statement best describes the potential energy of this system?

A
It changes from 296 J to 432 J.
B
It changes from 379 J to 243 J.
C
It changes from 432 J to 296 J.
D
It changes from 243 J to 379 J.
4

Which best defines energy?

A
a type of wave that carries energy through space, where there is almost no matter
B
a disturbance that carries energy form one place to another through matter and space
C
the ability to do work
D
pressing to make more compact
5

This table shows four examples of experiments.

Question illustration
A
Lily and Henry
B
Astrid and Bob
C
Lily, Astrid, Henry, and Bob
D
Astrid, Henry, and Bob
6

Mateo’s parents are thinking about investing money to help develop a new fusion power plant. Which issue is most important to consider before making the investment?

A
Fusion has never been controlled, so how have they succeeded in doing it?
B
The fuel is quite limited, so have they discovered a more common fuel?
C
Fusion has been generating electricity for decades, so why build another fusion power plant?
D
Fusion requires high temperatures and pressures, so how have they reduced the energy cost for it?
7

Which will reduce the possible environmental damage associated with mining uranium?

A
installing newer water recycling systems in older power plants
B
increasing the reprocessing of used fuel for reuse
C
building additional fission nuclear power plants
D
developing better places to store radioactive wastes
8

Doug is doing work. Without knowing exactly what he is doing, which can be said about the work he is doing?

A
Energy is transferred.
B
Energy is increased.
C
Energy is decreased.
D
Energy is unchanged.
9

A 4400 W motor is used to do work. If the motor is used for 200 s, how much work could it do? (Power: P = W/t)

A
22 J
B
4200 J
C
4600 J
D
880,000 J
10

A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)

A
3.9 m
B
4.0 m
C
39.2 m
D
40.0 m
11

A nuclear power plant is scheduled to undergo a retrofitting. What is the most likely outcome of the change?

A
The power plant will no longer generate radioactive wastes.
B
The power plant will recycle the water it uses to cool the reactor.
C
The power plant will be able to reprocess its used uranium fuel.
D
The power plant will switch from fission reactions to fusion reactions.
12

Which best describes a difference between energy transformations in power plants and dams?

A
Only power plants use fossil fuels to transform energy.
B
Only dams use fission to generate thermal energy.
C
Only power plants use water to turn turbines.
D
Only dams use mechanical energy to produce electricity.
13

The total energy in a system is 675 J. The kinetic energy changes from 296 J to 432 J. Which statement best describes the potential energy of this system?

A
It changes from 296 J to 432 J.
B
It changes from 379 J to 243 J.
C
It changes from 432 J to 296 J.
D
It changes from 243 J to 379 J.
14

Which compares the problems associated with radioactive waste created from generating electricity using fusion reactions to waste created from generating electricity using fission reactions?

A
The radioactive waste from fusion reactions becomes less hazardous much sooner than the waste from fission reactions.
B
The radioactive waste from fission reactions becomes less hazardous much sooner than the waste from fusion reactions.
C
Although their radioactive wastes are hazardous for the same period of time, fusion reactions produce less waste than fission reactions.
D
Although their radioactive wastes are hazardous for the same period of time, fission reactions produce less waste than fusion reactions.
15

Under which condition is no work done?

A
A force pushes an object and slows it down.
B
A force pulls an object and speeds it up.
C
A force pulls down on an object that moves downward.
D
A force pushes up on an object that stays in place.
16

What is the overall energy transformation in a coal-fired power plant?

A
electrical to chemical
B
chemical to electrical
C
nuclear to radiant
D
radiant to nuclear
17

Hedea made a study chart about nuclear energy.Which best describes the error in Hedea’s chart?

Question illustration
A
The nuclei of atoms are split apart in both fission and fusion.
B
The nuclei of atoms are joined together in both fission and fusion.
C
Fission converts nuclear energy to electrical energy, not thermal energy.
D
Fission and fusion convert nuclear energy to both radiant and thermal energy.
18

Which compares the problems associated with radioactive waste created from generating electricity using fusion reactions to waste created from generating electricity using fission reactions?

A
The radioactive waste from fusion reactions becomes less hazardous much sooner than the waste from fission reactions.
B
The radioactive waste from fission reactions becomes less hazardous much sooner than the waste from fusion reactions.
C
Although their radioactive wastes are hazardous for the same period of time, fusion reactions produce less waste than fission reactions.
D
Although their radioactive wastes are hazardous for the same period of time, fission reactions produce less waste than fusion reactions.
19

Which is an example of potential energy?

A
a swimmer kicking their legs
B
a car driving on the road
C
an arrow flying at a target
D
a yo-yo in someone’s hand
20

How much time is needed for a 15,000 W engine to do 1,800,000 J of work? (Power: P = W/t)

A
0.008 s
B
8 s
C
120 s
D
1,785,000 s

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