8th Grade Science PSSA Mixed Review

Based on the graph, which statement best describes the relationship between atmospheric pressure and altitude?

• Atmospheric pressure controls altitude.

• Atmospheric pressure is equal to altitude.

• Atmospheric pressure increases as altitude increases.

• Atmospheric pressure decreases as altitude increases.

In 1901, the SS Port Morant became the world’s first refrigerated banana ship. It was equipped with carbon dioxide refrigeration. It could carry 23,000 bunches of bananas from Jamaica to England at a controlled temperature. What impact did cargo ship refrigeration systems have on the banana industry?

• It made transportation of bananas to overseas markets quicker

• It made bananas ripen by the time they arrived at their destination.

• It made bananas sweeter than bananas transported without any cooling.

• It made shipment of bananas to faraway ports possible with little spoilage.

Tags

NGSS.MS-PS3-3

The graph shows the relationship between two characteristics of a saltwater solution. Which ratio describes the changes in these two characteristics?

• 1:7

• 90:7

• 1:15

• 105:15

Which measurements are required to calculate the average speed of a car driving on a road?

• time and distance

• time and direction

• mass and distance

• mass and direction

A researcher placed three mice in a maze and recorded the time it took each mouse to complete the maze. Which relationship is best supported by the data collected by the researcher?

• More practice resulted in faster maze completion times for each mouse.

• More practice had no effect on the maze completion times for each mouse

• More practice had the greatest effect on Mouse 3’s final maze completion time.

• More practice reduced each mouse’s maze completion time by more than 10 seconds

Which part of a farm system is directly improved by the use of fossil-fuel-based fertilizers?

• air quality

• water purity

• soil temperature

• nutrients and minerals

Tags

NGSS.MS-LS2-1

Which statement best describes the relationship between the length of a metal spring and its potential energy as shown in the graph?

• Increased potential energy in the spring forces it to extend.

• Increased potential energy in the spring forces it to contract.

• As the length of the spring increases, its potential energy increases.

• As the length of the spring increases, its potential energy decreases.

Tags

NGSS.MS-PS3-2

Which word represents the basic unit of heredity in living organisms?

• gene

• zygote

• nucleus

• chromosome

Tags

NGSS.MS-LS3-1

Which statement best describes one way energy flows through this food web?

• Energy flows from American alligators to mud turtles to water plants.

• Energy flows from American alligators to blue herons to grass carp fish.

• Energy flows from water plants to mud turtles to American alligators to grass carp fish.

• Energy flows from water plants to grass carp fish to blue herons to American alligators.

Tags

NGSS.MS-LS2-3

Which example is a nonrenewable source of chemical energy?

• biofeul

• windmill

• gasoline

• solar panel