8th grade science EOC review-Part 1

The diameter of Saturn is almost 10 times that of the Earth, yet its density is much less. Which of the following best explains this difference?

• Saturn has multiple rings

• Saturn is a gaseous planet

• Saturn rotates at a different speed than Earth

• Saturn is farther from the sun than Earth

When a ball bounces, it has changing amounts of potential energy and kinetic energy. Eventually, however, the ball will stop bouncing. Why does the ball stop bouncing?

• the ball's energy get used up during the bouncing process

• the mass of the ball is probably too small to allow the ball to continue on it's own

• the pull of gravity is stronger than the energy in the ball, which makes the ball slow down

• the ball's energy gets transformed to other types of energy

Tags

NGSS.MS-PS3-5

Which of the following procedure BEST represents the Law of Conservation of Mass?

• evaporating sugar water leaves 5 grams of sugar and turns the water into water vapor

• combining 2 grams of copper and 4 grams of sulfer to make 6 grams of copper sulfate

• burning 2 kilograms of wood from a pine tree leaves 0.4 kilograms of ash and soot

• using filter paper to separate 2 grams of solid powder from 10 grams of water

Tags

NGSS.MS-PS1-5

Sea turtles hatch on the beach. Scientists have discovered that larger turtle hatchlings are more likely to survive than smaller hatchlings. They found that the larger hatchlings could move more quickly toward the water. This reduced the chances that predators would catch them. Which of the following describes the survival advantage for smaller hatchlings?

• competition

• natural selection

• mutualism

• commensalism

Tags

NGSS.MS-LS4-4

Megan ran tests on a mystery substance and found that it has a definite volume, high density, and flows easily. Which of the following statements BEST explains the mystery substance?

• a solid because it has a definite volume and flows easily

• a solid because it has a definite volume and high density

• a liquid because it has a definite volume and high density

• a liquid because it has a definite volume and flows easily

Which type of rock is most likely to form by process 2?

• magma

• igneous rock

• sedimentary rock

• metamorphic rock

A group of scientists want to design a system of instruments that will evaluate ocean winds, currents, and temperatures in order to more accurately predict weather. What should they do before they make the first complete working version of the system?

• evaluate the results of the system instruments

• build a prototype of the system of instruments

• improve the design of the system of instruments

• conduct tests on the system of instruments

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-4

Chandra x-ray Observatory has reported that they ahve found a new star near our solar system. The Chanda x-ray telescope detects x-rays in space. What does the use of the x-ray telescope reveal about the newly found star?

• the star produces electromagnetic waves with shorter wavelengths than visible light

• the star produces electromagnetic waves with lower frequencies than visible light

• the star produces pictures in addition to electromagnetic waves

• the star produces vibrating electrons in addition to electromagnetic waves

Tags

NGSS.MS-PS4-2

Look at the picture of the clear, thick window. What happens to light that shines on the window?

• the light cannot go through the window

• the light goes through the window without any change

• the light slows down as it goes through the window

• all of the light bounces back

Tags

NGSS.MS-PS4-2

The Earth is made of layers including the core, mantle, and crust. Which of the following BEST describes the Earth's core?

• a hot mass of metal

• less dense than the crust

• less dense than the mantle

• a cold mass of metal