AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S2_2022Unit 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: )

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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.

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