In an experiment, the one variable that is changed is called the
A.
dependent variable
B.
experimental variable
C.
independent variable
D.
controlled variable
Answer Explanation:
Therefore, the Correct Answer is C.
More Questions on TEAS 7
Q #1: A group of students perform an experiment to test terminal velocity, which is the greatest speed obtained by a falling object. The students dropped different numbers of coffee filters and measured the resulting terminal velocity. Which of the following conclusions is supported by the data in the following table?
A.
Heavier objects take more time to reach terminal velocity.
B.
Heavier objects fall faster than lighter objects.
C.
Terminal velocity is when the force of gravity is equal to air resistance.
D.
The greater the number of filters, the smaller the terminal velocity.
Answer Explanation
Looking at the given table, increasing number of filters increases the mass. It is noted that terminal velocity increases with increasing mass. Thus, we can conclude that heavier objects (large masses) fall faster that lighter ones.
Q #2: In an experiment, the one variable that is changed is called the
A.
dependent variable
B.
experimental variable
C.
independent variable
D.
controlled variable
Answer Explanation
Q #3: Which of the following reasons explains why it is important for new scientific findings to be published?
A.
Publishing findings will help scientists become more biased
B.
Scientists will get paid if their findings are published
C.
Other scientists can validate or disprove the findings
D.
This prevents other scientists from performing similar tests.
Answer Explanation
Learning is a continuous process and publishing new findings help discover new and unknown discoveries. Publishing the results of experiments enables the scientific community the evaluate the finding themselves and help them repeat the experiment or build on them to verify or disapprove results.
Q #4: Parasitic worm infestation is a hypothesized to be damaging to the host. However, scientists have recently discovered that worm infestation can relieve the effects of certain autoimmune disorders. In which of the following ways should the hypothesis be modified, given the new findings?
A.
Lack of worm infestations is the cause of some autoimmune disorders
B.
Worm infestation prevents the body from immune malfunction.
C.
Worm infestation reduces the severity of certain autoimmune disorders
D.
Worm infestations exacerbate the body’s immune reactions.
Answer Explanation
From the recent discovery, worm infestation relieves the effect of certain autoimmune disorders. From the given options, the hypothesis can be modified as: worm infestation reduces the severity of certain autoimmune disorders.
Q #5: Which of the following is a group that can be measured against the experimental group?
A.
Responding
B.
Control
C.
Variable
D.
Variable
Answer Explanation
an experiment is a test or trial that is conducted to test the principle or discover something unknown. For accurate comparisons, every experiment needs an experimental group and a control group. An experimental group refers to a variable or variables that are investigated while a control group is a variable that is not modified or changed during experimentation.
Q #6: The measurement indicated by the line across the center of the cell is best referred to as which of the following?
A.
Radius
B.
Volume
C.
Area
D.
Diameter
Answer Explanation
In the given figure, the line runs from point of the circle to the other through the center. This is known as diameter of the circle.
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