Science Skills & Lab Safety – Practice Test

If you are unsure about a step in a lab procedure after reading it, you should:

• Keep going and hope it works.

• Ask the teacher to explain before continuing.

• Skip it and move on.

• Stop and do something else.

During a lab, someone knocks over a beaker and it breaks. What is the safest action?

• Pick it up with your hands and throw it away

• Tell the teacher, block off the area, and have the teacher dispose of the glass safely.

• Sweep it up quickly before anyone notices.

• Have your lab partner clean it up.

The safety shower is used to __________, and the eye wash station is used to __________.

• Rinse chemicals off the body; rinse chemicals out of the eyes.

• Wash dirt off tables; clean goggles.

• Remove acids from the eyes; rinse beakers.

• Wash paint off the skin; clean tools.

At the end of a lab, you should:

• Return equipment but skip washing it.

• Wash your hands only if you used chemicals.

• Clean and return all equipment and wash your hands.

• Leave the cleanup for the next class.

A hypothesis is:

• A proven fact.

• A testable explanation for an observation.

• A final conclusion.

• A guess that cannot be tested.

Which of these is a testable hypothesis?

• If salt is added to water, then it will boil at a higher temperature.

• If my cat is happy, it will be cuter.

• If music is pretty, it will make plants smile.

• If it’s sunny, people will be happier.

Tags

NGSS.MS-PS2-2

In an experiment, the factor that is measured is called the:

• Hypothesis

• Constant

• Dependent variable

• Independent variable

Tags

NGSS.MS-PS2-2

Maria wanted to test which brand of tennis ball bounced the highest. She dropped each ball from the same height and measured how high it bounced. What is the independent variable?

• A. Brand of tennis ball

• B. Height the ball bounced

• C. Height dropped from

• D. Maria

Maria wanted to test which brand of tennis ball bounced the highest. In Maria’s experiment, what is the dependent variable?

• Brand of tennis ball

• Height the ball bounced

• Height dropped from

• Maria

Tags

NGSS.MS-PS2-2

In an experiment, the group that does not receive the independent variable and is used for comparison is called the:

• Dependent variable

• Independent variable

• Constant

• Control group