Physical Science Post Test

Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?

• The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together

• The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet

• The insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surface

• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

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DOK Level 2: Skill/Concept

The electric field surrounding a positively charged object is

• Away from the charge

• Toward the charge

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DOK Level 2: Skill/Concept

A 5 kg object is subjected to a force of 20 N. What is the acceleration of the object?

• 2 m/s²

• 4 m/s²

• 5 m/s²

• 10 m/s²

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DOK Level 3: Strategic Thinking

Using the periodic table, which of the following properties does Terry list for helium? Select all that apply.

• Helium is a metal.

• Helium is a metalloid.

• Helium is a nonmetal.

• Helium has 2 valence electrons.

• Helium has 4 valence electrons.

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NGSS.MS-PS1-1

What form of energy cause a hot-air balloon to rise into the air?

• A

• B

• C

• D

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NGSS.MS-PS1-4

_______ cannot be easily compressed can be cut, has definite shape and volume

• solid

• liquid

• gas

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NGSS.MS-PS1-4

______ is anything that has mass and takes up space.

• properties

• relative density

• mass

• matter

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NGSS.5-PS1-1

NGSS.5-PS1-3

The chemical properties of calcium are MOST similar to the chemical properties of :

• Ar

• K

• Sc

• Mg

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NGSS.MS-PS1-2

Which of these correctly describes the energy that makes the carousel turn?

• F

• G

• H

• J

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NGSS.MS-PS3-5

Which of these is NOT an example of the bicycle using mechanical energy?

• A

• B

• C

• D

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NGSS.MS-PS3-1

NGSS.MS-PS3-5