AnswersAISD-TX-Earth Systems A - Credit Recovery 2025-26Scientific Knowledge

Scientific Knowledge — Unit test Answers

2 verified answers
1
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Which model is most likely used to predict a future event?

A
a model of a cell
B
a model of Mars
C
a model of weather systems
D
a model of prosthetic limbs
2
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The list shows the results of six athletes competing in the long jump, which has a target distance of 20 feet.12 feet, 11 feet, 13 feet, 10 feet, 20 feet, 12 feet

A
fairly accurate but not precise
B
fairly precise but not accurate
C
not precise and not accurate
D
fairly precise and fairly accurate
3

Why is it important to have a control group in an experimental investigation?

A
to show what happens when the dependent variable is not changed
B
to see how the dependent variable changes the independent variable
C
to compare the results when the independent variable is not involved
D
to allow the researchers to change the dependent variable as they wish
4

Which characteristic should a good scientific question have?

A
It should lead to a hypothesis that is testable.
B
It should have an answer that is already known.
C
It should not be answerable just through investigation.
D
It should include many variables about a wide range of topics.
5

Students are studying the changing concentration of carbon dioxide levels in different substances. They insert sensors into each substance and allow a device to graph the results.What are the students most likely using?

A
thermometers
B
microscopes
C
probeware
D
silverware
6

Advancements in which field have increased the ability to store increasing amounts of data on electronic devices?

A
social skills
B
driving skills
C
technology
D
biology
7

The kinetic molecular theory states that all matter is made up of atoms that are in continuous random motion. If a scientist discovered that several atoms seemed to move in a predictable pattern, what is the likely effect of this discovery on the kinetic molecular theory?

A
Since the new discovery contradicts the theory, the theory would be replaced or dismissed.
B
Since the new discovery adds to current knowledge, the theory would be modified.
C
Since the new discovery presents evidence that supports the theory, the theory would be further supported.
D
Since the new discovery disproves the theory, the theory would need to be modified into a law.
8

Chet plans an experimental investigation to see how well a new fertilizer works on daisies. The fertilizer must be dissolved in water and delivered to the plants by spraying it onto the leaves and stems.To set up his control group for the experiment, Chet should leave out the

A
air.
B
water.
C
daisies.
D
fertilizer.
9

Which is one reason why hydrogen is considered a better fuel source for cars?

A
It is nonrenewable.
B
It produces carbon dioxide.
C
It emits no harmful emissions.
D
It combines with water to produce electricity.
10

What is 0.000345 expressed in scientific notation?

A
3.45 × 102
B
3.45 × 104
C
3.45 × 10–2
D
3.45 × 10–4
11

Which action would best demonstrate that a scientist is being creative?

A
using prior knowledge to solve problems
B
requiring evidence and thinking logically
C
taking a closer look at the natural world
D
following strict rules when using human test subjects
12

Alicia conducted an experiment to find out which insulating material holds in the most heat. She did multiple trials of each test and recorded observations of each trial.Why did Alicia do more than one trial?

A
to improve the variability of her data
B
to prevent other people from using the data incorrectly
C
to help in arriving at a conclusion even with inaccurate data
D
to reduce the likelihood of errors in the experiment
13

Which describes the correct procedure when converting a number from scientific notation to standard notation?

A
If the power of 10 is positive, move the decimal point to the left.
B
If the power of 10 is positive, move the decimal point to the right.
C
If the number being converted is greater than 10, move the decimal point to the left.
D
If the number being converted is greater than 10, move the decimal point to the right.
14

The table shows results of an experiment that was replicated.

Question illustration
A
They are precise and reproducible.
B
They are precise but not reproducible.
C
They are accurate and reproducible.
D
They are accurate but not reproducible.
15

A theory is accepted as true when

A
a single experiment produces evidence that proves it is true.
B
several prominent scientists support the theory.
C
several repeated experiments yield similar results.
D
a few significant experiments produce similar results.

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