Unit Test — Unit test Answers

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1
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How does the Sun release nuclear energy?

A
through the fusion of a uranium nucleus into smaller nuclei
B
through the fusion of hydrogen nuclei into a heavier nucleus
C
through the fission of a uranium nucleus into smaller nuclei
D
through the fission of hydrogen nuclei into a heavier nucleus
2
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What is the unit of measure for energy?

A
watt
B
newtons
C
joules
D
meters per second
3

Which is occurring when work is being done?

A
Energy is being reverted.
B
Energy is being decreased.
C
Energy is being increased.
D
Energy is being transferred.
4

Nuclear energy is currently used in which three kinds of vehicles?

A
cars, submarines, spacecraft
B
submarines, ships, spacecraft
C
spacecraft, airplanes, cars
D
airplanes, submarines, ships
5

Adita lifts a book from the floor, carries it across the room, and places it on a high shelf. When is Adita doing work on the book?

A
She does work on the book at no time during this process.
B
She does work only while she carries the book across the room.
C
She does work from the moment she touches the book until she lets it go.
D
She does work as she picks up the book and as she lifts it to the shelf.
6

What is needed for work to be done?

A
A force must push on an object without moving it.
B
A force must pull on an object without moving it.
C
A force must cause an object to move along the same direction as the force.
D
A force must act on an object while an equal force acts oppositely on the object.
7

Which set of terms best defines what affects kinetic energy and potential energy, respectively?

A
position, gravity
B
gravity, velocity
C
velocity, height
D
height, position
8

The table shows information about four students who are running around a track. Which statement is supported by the information in the chart?

Question illustration
A
Autumn has more kinetic energy than Chiang.
B
Mohammed has less kinetic energy than Autumn.
C
Lexy has more kinetic energy than Mohammed.
D
Chiang has less kinetic energy than Lexy.
9

When a person strikes and lights a match, potential energy in the match is transformed into which types of energy?

A
electrical and thermal
B
thermal and radiant
C
radiant and nuclear
D
nuclear and kinetic
10

What is the source of almost all energy on Earth?

A
Earth’s hot core
B
the Sun
C
stored carbon
D
moving water
11

Which is the best location for storing radioactive wastes?

A
in the sand of a remote island
B
in chambers carved into the rock of a mountain
C
in the lava tubes of an active volcano
D
in natural caverns formed by the action of a river
12

If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?

A
Total energy increases.
B
Stored energy decreases.
C
Energy of motion decreases.
D
Total energy decreases.
14

Seema knows the mass of a basketball. What other information is needed to find the ball’s potential energy?

A
the volume and height the ball reaches
B
the volume and shape of the ball
C
acceleration due to gravity and the height the ball reaches
D
acceleration due to gravity and the shape of the ball
15

Which two types of potential energies would be types of mechanical energies?

A
electrical and kinetic
B
nuclear and chemical
C
radiant and thermal
D
elastic and gravitational
16

Simone created a chart to summarize the energy transformations that take place when energy from the wind is used to generate electricity.Which best completes the chart?

Question illustration
A
nuclear energy transformed to electrical energy
B
chemical energy transformed to electrical energy
C
radiant energy transformed to mechanical energy
D
kinetic energy transformed to mechanical energy
19

Which term is the product of force and distance?

A
power
B
work
C
net force
D
acceleration

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