The Practice of Science Quiz Review CS2 (2020+)

Anna runs an experiment to see if the brightness of a lamp can change how fast a plant grows. She runs 50 trials for the experiment and shows her results to Alyssa. Alyssa decides to recreate the same experiment herself to see if she can get the same results. Which of the following choices is a true statement?

• Anna use repetition. Alyssa replicated Anna's work.

• Anna used replication. Alyssa repetitioned Anna's work.

• Anna and Alyssa both used replication.

• Ann and Alyssa did not use repetition or replication.

Allen wants to find out if the temperature of water affects how much sugar can be dissolved in it. He sets up 5 pans with equal amounts of water. The water in each pan is heated up to a different temperature. Allen then measures how much sugar he can add to each pot until the sugar stops dissolving. What is the independent variable in this experiment?

• The temperature of the water

• The amount of sugar

• The amount of water

• The pan

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How many variables should be controlled in an experiment?

• Every variable except for the independent variable should be controlled in the setup of an experiment.

• Only one variable needs to be controlled.

• It is never necessary to have controlled variables in an experiment.

• Half of the variables need to be controlled in order to have a valid experiment.

Mike wants to test which brand of fertilizer works best. He plants 10 tomato plants. On receives no fertilizer. The others each receive a different brand of fertilizer. Half of the tomato plants are set outdoors for a week. The other half are kept indoors for a week. The indoor plants were watered each day. The outdoor plants received rainwater. After a week, Mike measured the change in height of the plants. When sharing his results to Jerry, Jerry points out that the results from this experiment aren't reliable. What flaw is there in Mike's experiment?

• Not all the plants received the same amount of light, water, or heat; Mike allowed too many variables to change.

• Mike controlled too many variables; too many things were kept the same.

• There is no dependent variable in this experiment.

• There's no control group

Tags

NGSS.MS-ETS1-1

Tom is a geologist and is recording his observations of rocks in a table. He records the color, texture, and grain size of various rocks. This is an example of...

• a descriptive (observational) investigation)

• a comparative investigation.

• an experimental investigation.

• a longitudinal investigation.

There are ponds on both the east side and west side of Brian's neighborhood. Brian wants to determine if there's any differences between the ducks at each pond. For a month, he observes the number of ducks, their feeding behaviors, and any other organism that interact with the ducks. This is an example of...

• a comparative investigation

• a descriptive (observational) investigation

• an experimental investigation

• a longitudinal investigation

Tags

NGSS.MS-LS2-2

Mike wants to test which brand of fertilizer works best. He plants 10 tomato plants. On receives no fertilizer. The others each receive a different brand of fertilizer. Half of the tomato plants are set outdoors for a week. The other half are kept indoors for a week. The indoor plants were watered each day. The outdoor plants received rainwater. After a week, Mike measured the change in height of the plants. When sharing his results to Jerry, Jerry points out that the results from this experiment aren't reliable. What flaw is there in Mike's experiment?

• Not all the plants received the same amount of light, water, or heat; Mike allowed too many variables to change.

• Mike controlled too many variables; too many things were kept the same.

• There is no dependent variable in this experiment.

• There's no control group

Tags

NGSS.MS-ETS1-1

NGSS.MS-LS2-1

Ashley wants to determine if the weight of a bowling ball affects how high it bounces. She selects four bowling balls of equal volume and made of the same surface material but have different weights. They are dropped from identical heights on a concrete surface and how high the bowling balls bounce back up is recorded. What is the dependent variable in this experiment?

• The bounce height of the bowling balls.

• The weight of the bowling balls.

• The volume and surface material of the bowling balls.

• Bowling balls can bounce?

Billy runs and experiment to determine what relationship exists between voltage and current in a electrical circuit. The graph shows his results. Based on the data, what relationship exists between voltage and current?

• As the voltage increases, current increases

• As the voltage increases, current decreases

• As the voltage decreases, current increases

• As the current decreases, voltange increases