AnswersFL-2003310-Physical ScienceUnit Test

Unit Test — Cumulative exam Answers

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21
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Lisa made the electromagnet shown.

Question illustration
A
She can use a nail with weaker magnetic properties.
B
She can change the direction of the nail.
C
She can increase the number of wire loops.
D
She can reduce the current in the wire.
22
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Why do nuclear power plants use fission instead of fusion?

A
Scientists have not yet gotten a fusion reaction to happen on Earth.
B
Per gram of fuel, fission releases more energy than fusion.
C
The energy from fusion cannot yet be converted to electricity.
D
Fusion requires conditions that use too much energy to maintain.
23

Which object reflects light with the longest wavelength?

A
a yellow book
B
a violet flower
C
a blue paper
D
a green leaf
24

A flashlight uses the chemical energy stored in a battery. This chemical energy is eventually converted into which two forms of energy?

A
mechanical and nuclear
B
radiant and thermal
C
thermal and mechanical
D
nuclear and electrical
25

Which two forces act directly on objects that are unable to be viewed by the unaided eye?

A
electromagnetic and strong
B
gravitational and electromagnetic
C
strong and weak
D
weak and gravitational
26

Which term refers to the ability to do work?

A
energy
B
power
C
force
D
motion
27

An object is moving north at a constant speed. A force of 5 N begins to push the object east at the same moment that a force of 5 N begins to push it west. What will happen to the object?

A
The object will turn toward the west.
B
The object will slow down and stop.
C
The object will accelerate toward the east.
D
The object will continue moving north.
28

Sudhi is studying the motion of a toy car. She places the car in the middle of a ramp and releases it.Which best describes the reference point in this scenario?

A
the top of the ramp
B
the bottom of the ramp
C
the ending position of the car
D
the starting position of the car
29

A circuit contains two light bulbs connected in parallel. What would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?

A
The brightness of each bulb would decrease because the total resistance of the circuit would decrease.
B
The brightness of each bulb would increase because the total resistance of the circuit would increase.
C
The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.
D
The brightness of each bulb would remain the same even though the total resistance of the circuit would increase.
30

Luz, who is skydiving, is traveling at terminal velocity with her body parallel to the ground. She then changes her body position to feet first toward the ground. What happens to her motion?

A
She will continue to fall at the same terminal velocity because gravity has not changed.
B
She will slow down because the air resistance will increase and be greater than gravity.
C
She will speed up because air resistance will decrease and be less than gravity.
D
She will begin to fall in free fall because she will have no air resistance acting on her.
31

Which best explains why Greg’s hands get warm as he holds a bowl of hot soup?

A
Heat energy is created from the thermal energy in Greg’s hands.
B
Heat energy is absorbed by the soup from Greg’s hands.
C
Thermal energy from the soup moves to Greg’s hands.
D
Thermal energy from the surrounding air moves to Greg’s hands.
32

Which sound would most likely have the lowest pitch?

A
a bird chirping
B
a vacuum-cleaner running
C
a lawn mower running
D
a dog barking
33

Plants appear green because they do not absorb the green wavelengths of light. What happens to those green light waves when they hit a plant?

A
They are diffracted.
B
They are absorbed.
C
They are reflected.
D
They are refracted.
34

Briana builds a circuit that has a resistance of 8.0 . What voltage should she apply to have a current of 0.8 A?

Question illustration
A
0.10 V
B
6.4 V
C
7.2 V
D
10 V
35

The graph indicates Linda’s walk.

Question illustration
A
Linda started out moving, and then stopped moving after 6 seconds.
B
Linda started moving away from the start point, and then moved closer.
C
Linda never moved the entire trip.
D
Linda’s path results in a negative slope.
36

What is the kinetic energy of a toy truck with a mass of 0.75 kg and a velocity of 4 m/s? (Formula: )

Question illustration
A
3 J
B
6 J
C
12 J
D
24 J
38

Brian creates the diagram below to organize his notes on nuclear fission and fusion.

Question illustration
A
produces neutrons
B
forms heavier atoms
C
joins two nuclei
D
forms lighter nuclei
41

Which best explains how fiber-optic technology benefits the field of medicine?

A
It allows doctors to view internal body structures to help them diagnose illnesses.
B
It helps surgeons make more accurate repairs to broken blood vessels.
C
It allows doctors to magnify cells so they can identify unhealthy cells that cause cancer.
D
It helps surgeons make cuts that are smaller and less painful than traditional methods.
48

Which best explains why a black T-shirt gets warmer in the Sun than a white T-shirt?

A
Darker colors reflect more energy from colliding particles than lighter colors do.
B
Darker colors absorb more energy from colliding particles than lighter colors do.
C
Darker colors reflect more energy from electromagnetic waves than lighter colors do.
D
Darker colors absorb more energy from electromagnetic waves than lighter colors do.
50

What is the potential energy of a 25 kg bicycle resting at the top of a hill 3 m high? (Formula: PE = mgh)

A
75 J
B
735 J
C
245 J
D
37.8 J

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