CAST Science 8 Practice Test 1

Use the graphs and the partial food web to predict the changes in the sea urchin population as the kelp pupulation INCREASES. What will happen to the sea urchin population?

• Sea urchin population increases

• Sea urchin population decreases

• Sea urchin population remains steady

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Use the graphs and the partial food web to predict the changes in the kelp population as the kelp pupulation INCREASES. What will happen to the kelp population?

• Kelp population increases

• Kelp population decreases

• Kelp population remains steady

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A student conducts 5 trials to investigate factors affecting the formation of impact craters. The student drops a marble into a box with fine powder. Analyze the results in the graph pictured. Because the mass is 40g in each trial, mass is a...

• constant

• control

• dependent variable

• independent variable

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A student conducts 5 trials to investigate factors affecting the formation of impact craters. The student drops a marble into a box with fine powder to measure the depth. Analyze the results in the graph pictured. Depth is the

• constant

• control

• dependent variable

• independent variable

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A student conducts 5 trials to investigate factors affecting the formation of impact craters. The student drops a marble into a box with fine powder at different speeds to measure the depth. Analyze the results in the graph pictured. Speed is the

• constant

• control

• dependent variable

• independent variable

Tags

NGSS.MS-PS3-1

A student conducts 5 trials to investigate factors affecting the formation of impact craters and here are the results. What is true about the results of the experiment?

• As the speed of the marble increases, the depth of the crater increases

• As the speed of the marble increases, the depth of the crater decreases

• As the speed of the marble increases, the depth of the crater stays the same

Tags

NGSS.MS-PS3-1

A student conducts 5 trials to investigate factors affecting the formation of impact craters and here are the results. Which statement BEST describes the results of the investigation?

• The kinetic energy of the marble just before impact is proportional to the depth of the crater it forms

• The kinetic energy of the marble just before impact is proportional to the mass of the marble

• The depth of the crater is proportional to the mass of the marble

• The depth of the crater is proportional to the mass of the marble

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Read the question in the photo. Select a moon location in the model that supports the explanation that the New Moon phase explains why the disk becomes a ring.

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ESS1-1

A student reviews the model shown and says that, based on the model, a solar eclipse should happen every time there is a new moon. However, solar eclipses occur less often than New Moons. Which feature of the model should be revised to best explain why solar eclipses do not happen every month?

• The model should show that the shape of the Earth's orbit around the Sun is an ellipse.

• The model should show that the shape of the Moon's orbit around the Earth is an ellipse.

• The model should show that Earth's equator is inclined relative to the plane of Earth's orbit around the Sun.

• The model should show that the plane of the Moon's orbit around the Earth is inclined relative to the plane of Earth's orbit around the Sun.

Tags

NGSS.MS-ESS1-1

Leah is learning to use properties of substances to identify a chemical reaction. She conducts two trials. In the first trial, she pours silicon dioxide (SiO2) into water (H2O). For the second trial, she pours silver nitrate (AgNO3) solution into a test tube with a solution of potassium chloride (KCl). Look at the diagram. In which trial did a chemical reaction occur?

• Trial 1

• Trial 2

• Both trial 1 and trial 2

• No chemical reaction happened in either

Tags

NGSS.MS-PS1-2