AnswersOC27 Physical Sci-2003310-S1-Keuten-DAquinoUnit Test

Unit 4: Test Answers

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A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor.If the motor is used for 30 s, how much work does it do? (Power: P = W/t)

A
0.03 J
B
30 J
C
960 J
D
27,000 J
22
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A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled’s potential energy? (Formula: PE = mgh)

A
90 J
B
56.8 J
C
441 J
D
882 J
23

Plants are responsible for a very important energy transformation, as shown.

Question illustration
A
radiant to chemical
B
nuclear to mechanical
C
chemical to thermal
D
mechanical to chemical
24

What happens in terms of energy when a moving car hits a parked car, causing the parked car to move?

A
The moving car transfers kinetic energy to the parked car.
B
Kinetic energy in the moving car disappears.
C
Kinetic energy in the parked car is created.
D
The parked car transfers kinetic energy to the moving car.
25

How do fission nuclear reactions differ from fusion nuclear reactions?

A
Fission reactions involve the conversion of matter into energy, but fusion reactions do not.
B
Fusion reactions involve the conversion of matter into energy, but fission reactions do not.
C
Fission reactions are used to generate electricity for consumers, but fusion reactions are not.
D
Fusion reactions are used to generate electricity for consumers, but fission reactions are not.
26

How does work affect energy between objects so it can cause a change in the form of energy?

A
Work transfers energy.
B
Work changes energy.
C
Work increases energy.
D
Work decreases energy.
27

If Jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, what is being done?

A
compression
B
work
C
radiation
D
energy creation
28

Which two factors are used to calculate the kinetic energy of an object?

A
gravity and velocity
B
velocity and mass
C
mass and volume
D
volume and height
29

In which situation is nuclear power most beneficial?

A
if there is a low concentration of people
B
if there is a nearby supply of fossil fuels
C
if there is an isolated location
D
if there are many other energy resources
30

Joshua programs a robotic arm to place a block in a box by following the sequence of commands in the table.During which step does the robotic arm do work on the block?

Question illustration
A
Step 1
B
Step 2
C
Step 3
D
Step 4
31

Olivia is on a swing at the playground.

Question illustration
A
W
B
X
C
Y
D
Z
32

A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled’s potential energy? (Formula: PE = mgh)

A
90 J
B
56.8 J
C
441 J
D
882 J
33

Which activity directly converts energy from the Sun into chemical energy?

A
a snake lying on a sunny rock to keep warm
B
a rabbit using energy from food it has eaten to run
C
a bean plant making its own food to grow
D
a person burning firewood to cook food
34

Which is a concern about mining for uranium?

A
Heated water could be released into the environment.
B
Dust released in the air could be radioactive.
C
Supplies could become low during a drought.
D
It is too commonly found, and mines could be too plentiful.
35

Which statement best defines the relationship between work and energy?

A
Work can transfer energy between objects and increase radiant energy.
B
Work can transfer energy between objects and cause a change in the form of energy.
C
Work can transfer energy between objects and decrease nuclear energy.
D
Work can transfer energy between objects and cause a change in the amount of total energy.
36

Keisha is making a diagram of a simple machine in the body.

Question illustration
A
X: loadY: fulcrumZ: lever
B
X: fulcrumY: wedgeZ: load
C
X: wedgeY: fulcrumZ: load
D
X: leverY: loadZ: fulcrum
37

What is the mechanical advantage of a pulley that changes only the direction of the load, not the effort force?

A
0.5
B
1.0
C
1.5
D
2.0
38

A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. This flame is used to melt a metal. Which energy transformation represents this process?

A
chemical energy into thermal energy
B
kinetic energy into potential energy
C
kinetic energy into electromagnetic energy
D
potential energy into chemical energy
39

Which is the best example of how electromagnetic energy is used?

A
a pot of boiling water on a gas stove
B
a patient receiving an X-ray in a hospital
C
a car burning gasoline to power the engine
D
a car of a roller coaster moving quickly down a slope
40

Which best describes heat?

A
energy that is carried by electric and magnetic fields
B
energy that decreases as a car slows to a stop
C
energy that increases as a book is lifted to a higher shelf
D
energy that flows from a hot mug of tea to a cold hand

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