AnswersMS-Physical ScienceUnit Test

Unit Test — Unit test Answers

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1
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Consider the incomplete equation below If this equation was completed, which statement would it best support?

Question illustration
A
Nuclear fusion produces elements that are heavier than helium.
B
Nuclear fusion produces elements that are lighter than helium.
C
Nuclear fission produces elements that are heavier than helium.
D
Nuclear fission produces elements that are lighter than helium.
2
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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.
3

A machine has an efficiency of 80%. How much work must be done on the machine so to make it do 50,000 J of output work?

A
12,500 J
B
40,000 J
C
62,500 J
D
90,000 J
4

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.
5

A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is

A
lighter than helium.
B
heavier than helium.
C
used for energy on Earth.
D
radioactive.
6

How does using a ramp make work easier when loading a piano onto a truck three feet above the ground?

A
It allows a larger force to be applied over a shorter distance.
B
It allows a larger force to be applied over a longer distance.
C
It allows a smaller force to be applied over a shorter distance.
D
It allows a smaller force to be applied over a longer distance.
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

What part of an atom is involved in a chemical reaction?

A
proton
B
neutron
C
nucleus
D
electron
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

Which term is the product of force and distance?

A
power
B
work
C
net force
D
acceleration
11

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
12

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.
13

What is the sequence of energy transformations that occur in a nuclear reactor?

A
nuclear energy mechanical energy thermal energy electrical energy
Option A
B
nuclear energy thermal energy mechanical energy electrical energy
Option B
C
thermal energy nuclear energy mechanical energy electrical energy
Option C
D
electrical energy thermal energy mechanical energy nuclear energy
Option D
14

Disposal of radioactive waste is a major concern in nuclear power production. Which method of disposal is least dangerous?

A
distributing nuclear waste in small quantities in many locations
B
releasing nuclear waste into the atmosphere where living things are not affected
C
encasing nuclear waste in containers that are then taken to remote locations
D
pouring nuclear waste into oceans and larger lakes
15

Examine the nuclear reaction: . Why is this classified as a nuclear reaction rather than a chemical reaction?

Question illustration
A
It is not balanced.
B
A new compound is formed.
C
A change has occurred in a nucleus.
D
A new element has been formed.
16

When Javier touches a hot mug of tea, energy is transferred from the surface of the mug to his hand. What kind of energy is this?

A
nuclear
B
radiant
C
thermal
D
chemical
17

An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have?

A
some shielding required
B
positive or negative charge
C
low penetrating power
D
no charge
18

Which type of reaction does this diagram represent?

Question illustration
A
nuclear fission because an atom is splitting into two fragments
B
nuclear fusion because the products that are produced are radioactive
C
nuclear fission because a large amount of energy is being released
D
nuclear fusion because atomic nuclei combine to form a heavier nucleus
19

As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?

A
It is increased.
B
It is conserved.
C
It is decreased.
D
It is created.
20

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.

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