AnswersPhysical Science Sem 1 2003310 BCPS 2026-27Evaluating Scientific Explanations

Evaluating Scientific Explanations — Unit test Answers

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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
2
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Which is a scientific claim?

A
At least 75 percent of the class will pass the physical science test today because they studied more than two hours for it.
B
According to the star of the number-one teen TV show, crushed rosemary and olive oil spread over pimples will draw out the bacteria and prevent scarring.
C
Plants fertilized once per week with Super Plant Food Formula have been shown in testing to produce twice as much fruit as plants that are not.
D
Placing half-filled one-gallon jugs of water out on the lawn prevents moles from occupying the space underground.
3

Which is one precaution to take when working with heat and fire?

A
Do not use during experiments.
B
Keep flammables away.
C
Avoid touching face and eyes.
D
Do not mix chemicals unless told to do so.
4

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.
5

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.
6

Material safety data sheets are used to give the information about a solvent. The excerpt below is part of an MSDS.

Question illustration
A
fire safety
B
disposal safety
C
chemical use safety
D
glassware safety
7

Which kind of investigations allow for the control of variables?

A
hypothesis
B
experimental
C
descriptive
D
comparative
8

Which professional most likely uses X-ray technology?

A
a food critic
B
a dentist
C
a financial analyst
D
a pharmacist
9

Read the measurement.

Question illustration
A
34 mL
B
38 mL
C
39 mL
D
40 mL
10

The table shows results of an experiment that was replicated.

Question illustration
A
They are neither precise nor reproducible.
B
They are precise but not reproducible.
C
They are accurate and reproducible.
D
They are accurate but not reproducible.
11

Which describes something in nature and predicts how it will behave without explaining why?

A
law
B
theory
C
hypothesis
D
data
12

Analyze the graph.

Question illustration
A
increasing parking meters
B
increasing traffic signals
C
increasing places to park bikes
D
decreasing bike-repair shops
17

Which is the SI base unit for mass?

A
meter
B
pound
C
gram
D
foot
19

A class is using marshmallows to demonstrate different chemicals’ properties by heating and cooling the marshmallows. Which student is practicing bad laboratory safety?

A
Neka is cleaning up the melted marshmallows after recording her observations.
B
Nikkos checks his glassware for imperfections before using them.
C
Kenneth is using the Bunsen burner to roast the marshmallows and eat them.
D
Kojo threw the used marshmallows into the trash can after his instructor told him to do so.
20

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.
25

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.
26

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
27

Which model best represents a pattern?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
28

Which best describes Internet wikis as a source of scientific information?

A
Wikis are good sources of reliable scientific information.
B
Wikis are written only by experts in their fields.
C
Wikis are always extensively peer reviewed.
D
Wikis are written or edited by anyone.
29

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.

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