Cumulative Exam — Cumulative exam Answers

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21
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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
22
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Scientists were conducting a multiyear study on the effectiveness of a new drug for long-term memory loss. They gave some of the test subjects the new drug to find out if it improves their long-term memory.Which is a possible limitation of this study?

A
Test subjects may want to participate in additional experiments.
B
Test subjects may find that the drug is not effective.
C
Test subjects may get bored and want to quit early.
D
Test subjects may have full-time jobs.
23

Which statement accurately describes a half-life?

A
A rock’s size is determined by half-life.
A
All stable and unstable elements have a half-life.
A
An atom of an element becomes half its original size in a half-life.
A
A half-life is the time required for half of a radioactive element to decay.
24

Where does compression often occur?

A
along a normal fault
B
along a strike-slip fault
C
at a divergent boundary
D
at a convergent boundary
25

Boyle's law states that the pressure of a gas tends to increase as the volume of the container holding the gas decreases.Which explains why this is a law rather than a theory?

A
It is a statement of fact.
B
It explains how the pressure of gases changes.
C
It has been revised and replaced over time.
D
It has changed due to advances in technology.

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