AnswersPhysical ScienceWork, Power, and Energy

Practice Test Answers

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

A
Only power plants use water to turn turbines.
B
Only dams use mechanical energy to produce electricity.
C
Only dams use fission to generate thermal energy.
D
Only power plants use fossil fuels to transform energy.
2
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A 40 kilograms dog is sitting on top of a hillside and has a potential energy of 1 comma 568 cap j What is the height of the hillside? (Formula: cap p cap e is equal to mg h )

A
3 point 9 m
B
4 point 0 m
C
39 point 2 m
D
40 point 0 m
3

Which best defines energy?

A
pressing to make more compact
B
the ability to do work
C
a type of wave that carries energy through space, where there is almost no matter
D
a disturbance that carries energy form one place to another through matter and space
4

Under which condition is no work done?

A
A force pulls down on an object that moves downward.
B
A force pushes an object and slows it down.
C
A force pulls an object and speeds it up.
D
A force pushes up on an object that stays in place.
5

Which is an example of potential energy?

A
a car driving on the road
B
a swimmer kicking their legs
C
an arrow flying at a target
D
a yo-yo in someone’s hand
6

Dimas reads that it takes 270 cap n to lift a firefighter’s equipment. If a firefighter does 5400 cap j of work carrying the equipment up a staircase, how high does the firefighter climb? (Work: cap w is equal to Fd )

A
5130 m
B
1 comma 458 comma 000 m
C
20 m
D
200 m
7

Which best describes the error in Hedea’s chart?

A
Fission converts nuclear energy to electrical energy, not thermal energy.
B
Fission and fusion convert nuclear energy to both radiant and thermal energy.
C
The nuclei of atoms are joined together in both fission and fusion.
D
The nuclei of atoms are split apart in both fission and fusion.
8

Which describes who will record their measurements in joules?

A
Astrid and Bob
B
Lily, Astrid, Henry, and Bob
C
Astrid, Henry, and Bob
D
Lily and Henry

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