Q1 Exam Practice

A group of students are studying the effect of temperature on the density of air. They obtained the following results from a controlled experiment, and concluded that the density of water is directly related to temperature. What statement best supports their conclusion?

• Lower temperatures had higher density values than higher temperatures.

• Lower temperatures had lower density values than higher temperatures.

• Higher temperatures had higher density values than lower temperatures.

• Higher temperatures did not cause any changes in density values.

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NGSS.MS-PS1-4

The scientific method is a process that scientists use to investigate something in the natural world. Which of these best describes the difference between a scientist collecting data and analyzing data?

• When a scientist collects data the hypothesis is compared to the data. When a scientist analyzes data, they predict future experiments.

• When a scientist collects data, the data include the observations made during the experiment. When a scientist analyzes the data, the scientist communicates his observations to other scientists.

• When a scientist collects data, he or she records the data from an experiment. When a scientist analyzes the data, he or she decides whether or not the data support the hypothesis.

• When a scientist collects data, the scientist develops new ideas for experiments. When a scientist analyzes the data, he or she looks at what could be improved in the investigation.

Which of the following statements about scientific theories is false? (6.N.3.1)

• A scientific theory is an explanation for a set of observations that are being made by multiple scientists.

• Scientific theories have been tested and tested over long periods of time.

• Scientific theories are a hunch or a feeling about what is happening.

• With new discoveries, scientific theories can be updated or changed.

After researching ideas and reviewing experiments about how life arose on Earth, a scientist reports in an interview that he has a new theory on the origin of life. Why is the scientist not using the term theory in its proper scientific sense? (6.N.3.1)

• His idea is based on observations and observations cannot be used to support a theory.

• His idea is not meaningful until he gives details about the idea; then it can be called a theory.

• Until his idea has been tested and supported by sufficient evidence, the idea is a hypothesis, not a theory.

• His idea needs to be reviewed and approved by scientists before he can call it a theory.

The science club is researching bacterial growth in water collected from different samples of water near the school. Four different groups test the samples of water each day. Carlos’s group ends up with very different results than the other three groups. What should Carlos’s group do? (6.N.1.4)

• Throw out their results and start the investigation over.

• Change their results so they match the results of the other three groups.

• Talk to the other groups to try to figure out why they got different results.

• Decide that the other groups are wrong and finish completing their report.

There are many reasons students compare results of a scientific investigation with other students. Which of the following is not a reason to compare results? (6.N.1.4)

• to discover possible errors in their own work

• to replace original data with another student’s data

• to learn about the different methods used to collect data

• to learn how other students interpreted data

What would be the major scientific concern if conclusions are drawn by the public before the results are replicated by other laboratories?

• Other agencies may hear of the results and claim credit for them.

• People may copy the ideas and sell them for profit.

• Conclusions may be drawn by the public before the results are replicated by other laboratories.

• The level of scientific research is turned into a media event.

Gabriela wants to replicate her classmate’s science experiment. Which of the following best describes what a replicable experiment means?

• An experiment created to solve a problem.

• An experiment that is new, created based on the same problem.

• An experiment that is copied to collect different results.

• An experiment that is able to be copied and gets similar results.

Scientists have several ways for evaluating the validity of experimental results. What does it mean when a science experiment is described as replicable?

• It can be repeated by a scientist other than the one who did the original work.

• It can be repeated by a scientist other than the one who did the original work and produce the same results.

• It can be repeated by the scientist who did the original work.

• It can be repeated by the scientist who did the original work and produce the same results.

Emily performed a test to see which brand of paper towel can hold the greatest number of pennies when wet. Which of the following represents an example of replication?

• Emily performs the same experiment again using 3 other brands of paper towels.

• Scott performs the same experiment as Emily using the same 3 brands of paper towel.

• Emily performs the same experiment again using the same 3 brands of paper towels.

• Scott performs the same experiment as Emily using 3 other brands of paper towels.