7th Grade Science Midterm Practice Part 2

One way to reduce bias in an experiment is to

• ask only girls about a school topic

• take numerical measurements of results

• use descriptive phrases as your data

• make sure that the results come out the way you want them

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Which is an example of using ethics in experiments?

• Informing human subjects of possible risks before taking part in a scientific study

• A scientist changing his data from his experiment to match his hypothesis

• not testing medicine before it's sold to the public

• experimenting without considering the effects on the environment

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Observations that deal with descriptions that cannot be expressed in numbers is called _________

• manipulated observations

• quantitative observations

• qualitative observations

• responding observations

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Joe decides that cereal is the best breakfast because he thinks cereal tastes better than other breakfast foods. Joe is being ___________

• honest

• obective

• subjective

• ethical

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Jacquelyn conducted an experiment to find out what happens to the temperature of water after it starts boiling. She measured the temperature of the water every 30 seconds during the experiment. She wants to graph her data.  If she puts temperature on the y-axis, what variable belongs on the x - axis?

• water

• state of matter

• time

• boiling point of water

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A scientist conducts an experiment to test a hypothesis. During the experiment, the scientist takes careful notes of the procedures followed and the results obtained. After the scientist completes the experiment, she shares this information with others who work at the same laboratory. Why is it important for a scientist to keep accurate records of the procedure and results of an experiment?

• Accurate records explain how the hypothesis was formed

• Accurate records show why a hypothesis is not supported

• Accurate records allow others to repeat the experiment

• The records help other scientists save time by not repeating the experiment

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Scientist conduct multiple trials on their experiments because ______

• Their results are more likely to be reliable

• It costs less to run more trials than fewer trials

• Unusual occurrences are likely to be repeated every time

• Experiments always have the same results

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Botanists study plants. Chemists study matter and its interactions. Volcanologists study volcanoes. What similarity exists among scientists working in these fields?

• They all gather information to answer questions about the natural world.

• They all use the same tools in their work.

• They all do their research exactly the same way.

• No similarities exist among scientist working in different fields.

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A factor in an experiment that stays the same to make the experiment reliable is ______________

• the independent variable

• the dependent variable

• a control group

• a constant

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Joaquin wants to learn about the effect different amounts of sunlight have on plants. He sets up tables with eight different plants. Every part of his experiment should be the same except the variable he is testing.  What is the variable?

• The type of plant

• The amount of sunlight each plant recieves

• The amount of water received by each plant

• The amount of nutrients he gives each plant

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