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Unit 10A Chapter 1 Quiz



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

An investigator is performing a controlled experiment to determine how the length of a wire affects the flow of electricity through the wire, using wires of varying lengths and observing the effect, if any, on the electrical current in the wire. What is (are) the independent variable(s) in this experiment?
a.
wire length
b.
electrical current in the wire
c.
all of the above
d.
none of the above
 

 2. 

An investigator wants to determine how the concentration of reactants affects the rate of a chemical reaction by changing the concentration and observing the effect, if any, on the reaction rate.  Identify the dependent variable(s) in this experiment.
a.
concentration of reactants
b.
reaction rate
c.
all of the above
d.
none of the above
 

 3. 

Which statement is true regarding a correlational study?
a.
The investigator does not control any of the variables.
b.
The independent variable is changed to determine what change, if any, occurs in the dependent variable.
c.
The dependent variable is changed to determine what change, if any, occurs in the independent variable.
d.
none of the above
 

 4. 

Which of the following refers to an observational study?
a.
It is an investigation in which the independent variable is purposely changed by the investigator.
b.
It is a study in which an investigator tries to determine whether one variable is affecting another variable, without controlling any of the variables.
c.
It involves watching a phenomenon or subject without influencing it.
d.
none of the above
 

 5. 

If there is a positive correlation between annual salary and years of education, which of the following accurately describes the relationship between these two variables?
a.
As years of education increases, annual salary also increases.
b.
As years of education increases, annual salary decreases.
c.
The line of best fit through a scatter graph of these two variables has a negative slope.
d.
There is no known relationship between these two variables.
 

 6. 

How would you describe the relationship between the two variables shown on the following graph?
mc006-1.jpg
a.
positive correlation
b.
negative correlation
c.
direct correlation
d.
no correlation
 

 7. 

In a correlational study, if  most of the data collected falls near the line of best fit, which of the following is always a true statement about the two variables?
a.
They have a weak correlation.
b.
They have a strong correlation.
c.
They have a positive correlation.
d.
They have no correlation.
 

 8. 

In which of the following examples would you be most likely to make an accurate prediction of one variable based on the other variable?
a.
two variables with a weak positive correlation
b.
two variables with a weak negative correlation
c.
two variables with a strong negative correlation
d.
two variables with no correlation
 

 9. 

Which of the following choices correctly orders the steps involved with a scientific investigation?
a.
plan, record, communicate, analyze
b.
initiate, analyze, perform, communicate
c.
plan, perform, analyze, communicate
d.
plan, interpret, perform, communicate
 

 10. 

Which of the following steps is performed during the initiating and planning phase of a scientific investigation?
a.
Record observations carefully.
b.
Specify how to control the variables not being tested.
c.
Identify errors in measurements.
d.
Plot graphs to show patterns and trends.
 

 11. 

You use a prediction in place of a hypothesis when
a.
you do not have a question to investigate
b.
your scientific question is not testable
c.
you have only qualitative data available
d.
you do not have a scientific explanation
 

 12. 

A brief description of the procedure for a scientific investigation is called a(n)
a.
hypothesis
b.
prediction
c.
experimental design
d.
variable
 

 13. 

All of the following are part of the performing and recording phase of a scientific investigation, except
a.
carefully following the procedures
b.
modifying the procedures as necessary
c.
being alert to safety concerns
d.
selecting appropriate equipment and materials
 

 14. 

Which of the following is an example of a quantitative variable?
a.
hair colour
b.
height
c.
eye colour
d.
odour
 

 15. 

Which of the following is an example of a qualitative variable?
a.
height
b.
weight
c.
colour
d.
age
 

 16. 

Which of the following formats is usually used to record quantitative data?
a.
words
b.
pictures
c.
tables
d.
sketches
 

 17. 

Which of the following steps occurs during the analyze and interpret stage of scientific investigation?
a.
identifying the independent and dependent variables
b.
determining how the changes in the variables will be measured
c.
anticipating and addressing safety concerns
d.
identifying errors in measurements
 

 18. 

The most common method for communicating with others about an investigation is
a.
doing a presentation
b.
writing a newspaper article
c.
writing a lab report
d.
creating a computer presentation
 

 19. 

Scientific literacy is necessary for which of the following careers?
a.
veterinary medicine
b.
mathematics
c.
art
d.
all of the above
 

 20. 

Scientific literacy
a.
helps people understand and evaluate information relating to science and technology so that they can make better decisions
b.
gives people a general understanding of scientific knowledge necessary to be an informed citizen
c.
provides people with specific knowledge and skills appropriate for a wide range of careers
d.
does all of the above
 



 
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