NOS Review Question Preview (ID: 63077)


Nature Of Science 8th Grade Florida Test Review Questions. TEACHERS: click here for quick copy question ID numbers.

Frances was working on an experiment for science class. She dropped 4 steel balls of different weights from the same height. She noticed that the balls all reached the ground at the same time. Frances is probably doing an experiment on the-
a) force of wind
b) quality of materials
c) effect of gravity
d) states of matter

Jaden is doing an experiment to find out if plants grow taller when given plain water or sugar water.To make sure his experiment is a fair test, Jaden should
a) treat both groups of plants the same except for the amount of sugar in the water.
b) give the sugar water plants twice as much water as the plain water plants.
c) put some plants in a warm, sunny spot and put the others in the shade.
d) use one kind of plant for the sugar water group and a different kind for the plain water group.

Any condition that can be changed in an experiment is called a variable. Which of these best explains why there should only be one variable changed in an experiment?
a) to get results from the experiment faster
b) to make the experiment easier to perform
c) to allow people to know what caused the observed results
d) to reduce the chance of mistakes when doing the experiment

A scientist experiments with lab rats in a controlled experiment about how the amount of exercise affects the body mass of lab rats. What is the independent variable of the experiment?
a) amount of exercise
b) amount of food given to rats
c) type of food given
d) size of rats enclosure

In an experiment, a sample of granite, limestone, marble, and sandstone each had a constant supply of water running over them for 96 hours. The rocks were then checked for signs of erosion. What was the purpose of this experiment?
a) To analyze the effects of weathering on various environments of Florida.
b) To see what kind of rock particles are suitable for purifying water.
c) To see how changes in the rate of water flow affect different kinds of rock.
d) To see the effects of pH on different kinds of rocks.

If an experiment is a controlled experiment, how many variables are intentionally changed?
a) as many as you want
b) 2-3
c) only 1
d) none

Which section of an experiment sheet tells what the experimenter expected to happen during the experiment?
a) Hypothesis
b) Results
c) Procedures
d) Conclusion

The experiments dependent variable is also described as
a) the one thing changed and tested
b) the variable used as a comparison
c) the data that is measured during or after the experiment
d) the variable that must remain the same throughout the experiment

Scientific models are often used to help scientists understand a problem.
a) True
b) False
c) a
d) b

Models that you can see ande touch are called __________ models
a) computer
b) graph
c) physical
d) idea

What is a scientific theory?
a) An explanation that ties together many hypotheses; explains why.
b) An explanation that ties together many hypotheses; explains how.
c) An explanation that ties together many experimental results; explains why.
d) An explanation that ties together many experimental results; explains how.

What is the difference between a experimental group and a control group?
a) the experimental group gets the treatment or independent variable, the control group does not.
b) the control group gets the independent variable or treatment, the experimental group does not.
c) they both are treated the exact same way in an experimental setting.
d) none of these are correct.

An experimental group that's purpose is for comparison to the other groups tested. This group does not receive the independent variable.
a) constant
b) dependent variable
c) contrast group
d) control group

How many independent variables does an experiment have?
a) one
b) two
c) three
d) four

What is an independent variable in an experiment?
a) The variable that is affected by changes in other variables
b) The variable that the researcher manipulates*
c) The variable that remains constant throughout the experiment
d) The variable that is not necessary in an experiment

Variable that is measured at the end of an experiment; the results (ex: does patient get better?) The dependent variable is always plotted on the Y axis.
a) Dependent Variable
b) Independent Variable
c) Theory
d) Conclusion

Qualitative observations are observations that
a) uses the five senses
b) uses numbers
c) are more accurate
d) are less accurate

What are Quantitative Observations?
a) a) Describing things like color
b) d) Measuring things like length, amounts, or time
c) c) How something smells
d) b) Describing how something tastes

What does repetition in science experiments refer to?
a) A) Performing a similar experiment in different locations
b) B) Repeating an experiment to test the reliability of the results*
c) C) Using multiple subjects in an experiment
d) D) Conducting the same experiment with different variables

What does scientific replication refer to?
a) A) The duplication of an entire research study by another scientist
b) B) The production of identical twins in a study
c) C) The repetition of a single experiment within a study
d) D) The publication of a research study twice

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