Test - OK Mastering the OSTP in Grade 8 Science Pretest

1 pt Standard: MS-PS1-6 DOK: 3

A group of students investigated how temperature affects the rate of chemical reactions. They used hydrogen peroxide, which breaks down into oxygen and water, for their experiment. The students measured how long it took to obtain 50 mL of oxygen gas from a given volume of hydrogen peroxide heated to different temperatures. Their data are shown in the table below. Then, basted on their students' data, select the correct conclusion about the rate of chemical reactions.

Reaction rates increase as time increases

Reaction rates decrease as time decreases.

Reaction rates increase as temperature increases.

Reaction rates decrease as temperature increases

1 pt Standard: MS-PS1-3 DOK: 2

You tear a tee shirt into small pieces and then burn the pieces. Which of the following statements are correct?

Both actions are chemical changes.

Both actions are physical changes

The first action is a physical change, and the second is a chemical change.

The first action is a chemical change, and the second is a physical change.

1 pt Standard: MS-PS4-1 DOK: 2

The diagram of a wave indicates two important properties of a wave: its wavelength and amplitude. Wavelength is inversely related to frequency: a longer wavelength indicates a lower frequency. Amplitude is proportional to the intensity of the energy that the wave can impart to matter: a greater amplitude indicates a greater intensity. Consider the following situation: Wave A has a wavelength 5λ and an amplitude 2y, while Wave B has a wavelength 3λ and an amplitude 4y.

Which statement best describes these two waves?

Wave A has a lower frequency and greater intensity than Wave B

Wave A has a higher frequency and greater intensity than Wave B.

Wave A has a higher frequency and lower intensity than Wave B

Wave A has a lower frequency and lower intensity than Wave B.

1 pt Standard: MS-PS2-2 DOK: 2

Select the situation that will result in the greatest gravitational force between two bodies.

large combined mass and small distance apart

large combined mass and great distance apart

small combined mass and great distance apart

small combined mass and small distance apart

1 pt Standard: MS-PS4-2 DOK: 2

Sound waves cause molecules to vibrate and bump into one another. For sound to travel, there must be molecules which can be made to vibrate. The closer together the molecules are, the faster the sound is able to travel. This explains why

sound travels faster in steel than in water

sound travels faster in outer space than in air.

sound travels faster in air than in water.

sound travels faster in water than in steel.

1 pt Standard: MS-PS1-3 DOK: 3

As illustrated in the diagram below, Carl investigated the change of mass during a chemical reaction. He massed a plastic bottle that contained 50 mL of water, a balloon, and two seltzer tablets. He recorded a total mass of 200g. Carl put the seltzer tablets inside the balloon and pulled the balloon over the neck of the bottle. He shook the balloon, so the seltzer tablets fell into the water. Carl observed the tablets fizzing and the balloon expanding. Carl again massed his apparatus after the fizzing and the expansion of the balloon stopped.

195 g

between 195 g and 200 g

200 g

more than 200 g

1 pt Standard: MS-PS4-2 DOK: 1

Your mom looks in the rearview mirror of the car to check the position of other cars nearby. What behavior of light allows her to see the cars in the mirror?

reflection

refraction

diffraction

radiation

1 pt Standard: MS-PS4-2 DOK: 2

ROYGBIV describes visible light portion of the electromagnetic spectrum, with red light (R) at one end and violet light (V) at the other. Which of the following statements is true?

Violet light has a higher frequency and shorter wavelength than red light

Violet light has a lower frequency and shorter wavelength than red light.

Violet light has a higher frequency and longer wavelength than red light

Violet light has a lower frequency and longer wavelength than red light.

OK Mastering the OSTP in Grade 8 Science Pretest

OK Mastering the OSTP in Grade 8 Science Pretest Sample