8th Grade Science Review Questions

A scientist combines 18 g of substance A with 12 g of substance B in a closed system. What should be the total mass of the products?

• 6 g

• 30 g

• 12 g

• Cannot be determined

Tags

NGSS.MS-PS1-5

In a balanced chemical equation, why must the number of atoms for each element be the same on both sides?

• To make the equation easier to read

• Because mass is lost during reactions

• Because of the conservation of mass

• To increase the reaction speed

Tags

NGSS.MS-PS1-5

If you double the mass of an object and keep the force the same, what happens to its acceleration?

• It doubles

• It is cut in half

• It stays the same

• It becomes zero

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NGSS.MS-PS2-2

A force of 100 N is applied to a 25 kg object. What is the acceleration?

• 2.5 m/s²

• 4 m/s²

• 25 m/s²

• 0.25 m/s²

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NGSS.MS-PS2-2

Which example best illustrates Newton's First Law?

• A rocket launches into space

• A ball rolls and eventually stops

• A book remains at rest on a table

• A car speeds up on a highway

Why does a swimmer move forward when pushing back against the wall of a pool?

• The swimmer gains mass

• The wall pushes forward with equal force

• Gravity assists the movement

• Water creates pressure behind the swimmer

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NGSS.MS-PS2-1

Which type of cell needs the most mitochondria and why?

• Blood cell - transports oxygen

• Cardiac muscle cell - requires constant energy

• Epidermal cell - protects the body

• Smooth muscle cell - helps digestion

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NGSS.HS-LS1-7

What is the main function of the vacuole in a plant cell?

• Controls the cell

• Stores water and nutrients

• Protects from viruses

• Builds proteins

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NGSS.MS-LS1-2

What do genes located on chromosomes do?

• Randomly assign personality

• Control inherited traits

• Control the shape of the chromosome

• Only work in adult organisms

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

Which is TRUE about genes? Select two:

• Genes are segments of chromosomes

• Genes randomly appear in offspring

• Genes are only active during reproduction

• Genes control traits

Tags

NGSS.MS-LS4-4