AnswersEA ACADEMY PHYSICAL SCIENCE SPRINGUnit Test

Unit Test — Unit test Answers

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1
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Which model best represents a pattern?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
2
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Which describes something in nature and predicts how it will behave without explaining why?

A
law
B
theory
C
hypothesis
D
data
3

What is a main reason why the scientific model of atoms is considered a theory rather than a law?

A
It has been proven as a fact.
B
It has been changed over time.
C
It predicts but does not explain.
D
It has stayed the same for a long time.
4

Which serves as evidence for a scientific claim?

A
surveys of public opinion
B
company advertisements
C
controlled experiments
D
personal websites
5

Which microscope is the most powerful and can map the atoms on the surface of an object?

A
a classroom compound microscope
B
a transmission electron microscope
C
a scanning electron microscope
D
a scanning tunneling microscope
6

Bena thinks that dissolving more salt in water causes the mixture’s freezing temperature to change.Which is the best type of scientific investigation for Bena to use to study this?

A
an experimental investigation, because it can provide the most data
B
a comparative investigation, because it uses a wide range of variables
C
an experimental investigation, because it allows for the control of variables
D
a comparative investigation, because it would take the least amount of time
7

Read the passage about the health risks of single-load liquid laundry packets.These packets are filled with concentrated, toxic chemicals. A 7-month-old in Florida died from swallowing the soap. Several soap and detergent companies are conducting studies to address these safety concerns; they want to reduce toxicity and to make the packets look less like candy. The U.S. Consumer Product Safety Commission (CPSC) is also performing studies to build more safety into these products.

A
The CPSC is the only organization that can test the safety of soaps and detergents.
B
Studies conducted by any company that benefits financially are considered unreliable.
C
Studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company.
D
Tests performed by the CPSC follow established scientific methods, but those performed by soap companies do not.
8

Which kind of investigations allow for the control of variables?

A
hypothesis
B
experimental
C
descriptive
D
comparative
9

The results of a dart game were precise but not accurate. The accepted value of the game was the center of the dartboard.

A
All of the darts hit the center of the board.
B
Some of the darts hit the center of the board.
C
The darts hit the same general area of the board.
D
The darts hit very different areas of the board.
10

Which best describes the purpose of bar graphs?

A
They show changes over a period of time.
B
They compare quantities for particular categories.
C
They show the relationship among parts of a whole.
D
They compare ranges as continuous data.
11

When an experiment is replicated, how should the results of the two experiments compare?

A
The results of the first experiment should be less accurate.
B
The results of the second experiment should be less accurate.
C
The results of the experiments should be similar.
D
The results of the experiments should be one hundred percent certain.
12

Which describes data that is faked or misplaced?

A
reasonable
B
authentic
C
invalid
D
accurate
13

Which is caused by distracted drivers and may most likely be reduced by brain-powered cars?

A
fuel consumption
B
busy highways
C
traffic accidents
D
harmful emissions
14

Which professional most likely uses X-ray technology?

A
a food critic
B
a dentist
C
a financial analyst
D
a pharmacist
15

Analyze the graph.

Question illustration
A
increasing parking meters
B
increasing traffic signals
C
increasing places to park bikes
D
decreasing bike-repair shops
16

Alisha organizes her data about the element lead into a table.Which did Alisha place in the wrong column?

Question illustration
A
Density: 11.34 g/cm3
B
Soft
C
Solid at room temperature
D
Malleable
17

Scientists in a particular field strive for the same quality of work because they know their peers will be reviewing their scientific claims. What does this review process help ensure?

A
standards of the profession
B
publication in scientific journals
C
resistance to new information
D
access to university databases
18

Ingrid wrote the hypothesis below.If the temperature of a liquid increases, the density of the liquid decreases because the particles move farther apart.What are the variables in her hypothesis?

A
The independent variable is the temperature, and the dependent variable is the density.
B
The independent variable is the density, and the dependent variable is the temperature.
C
The independent variable is the temperature, and the dependent variable is the distance between particles.
D
The independent variable is the distance between particles, and the dependent variable is the temperature.
19

Why is newton's first law of motion considered a law and not a theory?

A
It is an unsupported idea.
B
It is based on multiple observations.
C
It has never been tested.
D
It was validated by a singular experiment.
20

Which characteristic should a good scientific question have?

A
It should lead to a hypothesis that is not testable.
B
It should have a very broad focus with many variables.
C
It should repeat a question that the researcher has answered before.
D
It should be based on observations instead of just imagination.

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