AnswersDCSS Physical Science CR 24-25Unit Test

Unit Test Answers

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1
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Which best describes what happens if two waves meet and build on each other?

A
constructive interference
B
destructive interference
C
reflection
D
absorption
2
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Which statement can be made about the amplitude of any transverse wave?

A
It is the length from the midpoint to the crest.
B
It is half the length from the midpoint to the trough.
C
It is the length of the wavelength.
D
It is half the length of the wavelength.
3

Which type of reaction is Mg + S → MgS?

p
polymerization
s
synthesis
r
replacement
d
decomposition
4

What kind of acceleration occurs when an object speeds up?

A
positive
B
negative
C
neutral
D
zero
5

The diagram shows organisms a diver observed during an ocean dive.

Question illustration
A
the ocean surface
B
the ocean floor
C
the position of the clownfish
D
the position of the seaweed
6

What must be included when describing the displacement of an object?

A
measurement and direction
B
direction and speed
C
total distance and position
D
speed and total distance
7

Which state(s) of matter have no definite shape or volume?

l
liquids and solids
l
liquids and gasses
g
gasses
s
solids
8

Which statement gives two characteristics of all liquids?

A
They spread out to fill space and have atoms that vibrate in place.
B
They have atoms that vibrate in place and have a definite shape.
C
They will change shape to fit a container and have definite volume.
D
They have definite volume and have atoms that move freely in all directions.
9

Koto traveled 5,000 meters north from her house with an average velocity of 4.5 m/s.What was the time of her trip? (There are 60 seconds in 1 minute.)

1
18.5 minutes
2
20.4 minutes
2
2 hours
3
3 hours
10

Tanner is running his finger around the top of a crystal glass with a natural frequency of 1100 hertz. If Tanner can cause the glass to resonate, it could create a high-pitched sound and shatter.

A
vibrate the glass at 550 hertz
B
vibrate the glass at 1100 hertz
C
increase the loudness of the vibration
D
decrease the loudness of the vibration
11

Which of these actions would increase heat transfer between two objects?

e
establishing their thermal equilibrium
i
increasing the area of their contact
u
using objects with similar specific heats
r
reducing the time of their contact
12

Which metal is most likely to form more than one kind of positively charged ion?

A
sodium (Na)
B
barium (Ba)
C
nickel (Ni)
D
magnesium (Mg)
13

Hamish is studying what happens when he sends a sound wave through different mediums, and he records his data in a table.

Question illustration
A
Wave 1 will move the fastest.
B
Wave 2 will move the slowest.
C
Wave 3 will move the slowest.
D
Wave 4 will move the fastest.
14

Two examples of energy transformations are shown.

Question illustration
A
begin with chemical energy.
B
begin with electrical energy.
C
result in radiant energy.
D
result in mechanical energy.
15

Which important change in electronic devices, such as televisions and computers, is a result of the use of metalloids as semiconductors?

A
Electronic devices have become smaller.
B
Electronic devices are now more brittle.
C
Electronic devices now use more energy.
D
Electronic devices have become more expensive.
16

Which best contrasts an electric generator and an electric motor?

A
In a generator, slip rings function as a solenoid, and in a motor, an armature functions as a solenoid.
B
In a motor, slip rings function as a solenoid, and in a generator, an armature functions as a solenoid.
C
A generator converts electrical energy to kinetic energy, and a motor converts kinetic energy to electrical energy.
D
A generator converts kinetic energy to electrical energy, and a motor converts electrical energy to kinetic energy.
17

Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O?

A
Ca(OH)2 + H3PO4 → Ca3(PO4)2 + 6H2O
B
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
C
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 3H2O
D
Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
18

[BLANK]

A
synthesis
B
polymerization
C
decomposition
D
oxidation
E
replacement
19

What is the overall energy transformation in a coal-fired power plant?

A
electrical to chemical
B
chemical to electrical
C
nuclear to radiant
D
radiant to nuclear
20

Which describes an object’s speed when free falling in a vacuum?

A
The object accelerates until it reaches its terminal velocity.
B
The object falls at a constant speed because only one force acts on it.
C
The object falls faster and faster until it strikes the ground.
D
The object speeds up and then stops when air resistance equals gravity.

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