Multiple Choice
Identify the choice
that best completes the statement or answers the question.
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1.
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A scientist conducted an experiment to determine
how the amount of salt in a body of water affects the number of plants that can live in the water. In
this experiment the dependent variable is
a. | the amount of salt in the water | c. | the number of plants in the water | b. | the water | d. | the temperature of the
water |
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2.
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All the things in an experiment that must be the
same to make it fair are called
a. | dependent variables | c. | controlled variables or constants | b. | independent variables | d. | controlled
experiments |
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3.
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Most typically, the order in which the steps of
scientific investigations are applied is
a. | observations, hypothesis, controlled testing,
conclusions, questions. | b. | observations,
hypothesis, conclusions, controlled testing, questions. | c. | observations, questions, hypothesis, controlled testing,
conclusions. | d. | observations,
hypothesis,controlled testing, questions, conclusions. |
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4.
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A researcher presented the results from an
experiment on the effectiveness of a new type of eyedrops. The eyedrops were designed to prevent
contact lenses from drying out and irritating the eyes. The researcher tested the eyedrops over a
two-year period using subjects who wore various types of contact lenses. The results of the research
showed that the eyedrops did prevent contact lenses from drying out. Before manufacturing the new
drops, the researcher must verify that his results are free of bias by
a. | extending his research for three more
years. | c. | testing a larger population of subjects using different
brands. | b. | investigating similar products and their
results. | d. | having an independent research company perform the same
investigation. |
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5.
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Scientific hypotheses are most often tested by the
process of
a. | communicating. | c. | experimenting. | b. | inferring. | d. | analyzing data. |
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6.
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An experiment that tests only one factor at a time
by using a comparison of a control group and an experimental group is called __________
a. | a dependent variable | c. | a theory | b. | an independent
variable | d. | a controlled experiment |
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7.
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A scientific theory
a. | is absolutely certain. | b. | is unchangeable. | c. | may be revised as
new evidence is presented. | d. | is a controlled
experiment. |
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8.
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Ebola virus is a potentially deadly virus in the
blood which causes Ebola fever. Ebola virus is often spread by monkeys. Scientists used 2 groups of
monkey kidney cells in an experiment to confirm the first human case of Ebola fever. The scientists
inoculated cells in Group 1 with samples of the Ebola virus taken from a human with Ebola fever. They
did not inoculate the cells in Group 2.
What was the control group in the
experiment?
a. | The Ebola virus | c. | Monkey
kidney cells in Group 1 | b. | All of the monkey
kidney cells | d. | Monkey kidney cells in Group 2 |
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9.
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A scientist hypothesizes the the temperature at
which an alligator's egg is incubated will determine whether the alligator will be male or
female. The independent variable is
a. | the incubator | c. | the
male alligators | b. | the
temperature | d. | the gender of the alligator |
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10.
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The variable that is manipulated in an experiment
is the ____ variable.
a. | independent. | c. | control. | b. | dependent. | d. | experimental. |
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