8th Grade PreTest

DDT is a chemical that is sprayed to lower the population of mosquitos in an effort to reduce the risk of certain diseases. Due to genetic variation in the mosquito population, a few are resistant to DDT and survive. What will be the future impact on the mosquito population after years of DDT use?

• increase in the number of mosquitoes that are sensitive to DDT

• increase in the number of mosquitoes that are resistant to DDT

• increase in the number of mosquitoes that can be used to treat diseases

• increase in the number of mosquitoes that can withstand all types of chemicals

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

NGSS.MS-LS3-1

NGSS.MS-LS4-4

Genetic screening technologies allow scientists to take a small sample of DNA from a developing organism and predict possible diseases the organism may develop during its lifetime. This is done by comparing the genes of the developing organism to the specific genes that code for and possibly develop into the disease later in life.

• Who will be able to benefit from this technology?

• What effect will the use of this technology have on the treatment of the common cold?

• Do the benefits of this technology outweigh the risks involved?

• How will the knowledge obtained from this technology affect an individual?

Tags

NGSS.MS-LS4-4

NGSS.MS-LS4-5

A student examines objects 1 and 2 as shown. (Diagram: Object 1: 15 kg, Object 2: 30 kg, Distance: 10 cm) What change would increase the gravitational force of attraction between objects 1 and 2?

• Reduce the distance to 5 cm.

• Increase the distance to 15 cm.

• Replace object 1 with a 5 kg object.

• Replace object 2 with a 10 kg object.

Tags

NGSS.MS-PS2-4

A student applies a 10 N force to a wood block with a mass of 5 kg. The block is pushed across four different surfaces. The accelerations of the block are recorded. Block Acceleration Data: Surface | Acceleration (in meters per second squared) 1 | 1.6 2 | 1.4 3 | 1.8 4 | 1.3 Which can be concluded from the information in the table?

• The block moved for the longest time over Surface 3.

• The block showed the least friction on Surface 3.

• The block had the greatest weight on Surface 4.

• The block had the largest inertia on Surface 4.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Regions exist below the plates which provide localized sources of high heat energy to sustain volcanism. What are these regions called?

• subduction zones

• hot spots

• convection centers

• asthenosphere thermals

Tags

NGSS.MS-ESS2-1

Examine the information recorded on May 5, 2012 in the four seismograms. Which seismograph station was closest to the epicenter of the earthquake?

• station 1

• station 2

• station 3

• station 4

In the early 1900s, scientists discovered that certain properties of light were changed depending on the distance between Earth and the object being observed. In 1929, Edwin Hubble compared this phenomenon to the relative distances between a certain set of stars. Hubble found that when the two sets of data were graphed against one another, each star appeared to be farther from one another than what the relative distance indicated. With this information, Hubble concluded the universe is expanding. What phenomenon was discovered by early astronomers and used by Hubble to confirm that the universe is expanding?

• The light emitted by the galaxies becomes brighter as they move away from one another.

• The light emitted by the galaxies becomes whiter as they move away from one another.

• The wavelength of the light emitted by the galaxies shifts to the blue region of the spectrum as the galaxies move away from one another.

• The wavelength of the light emitted by the galaxies shifts to the red region of the spectrum as the galaxies move away from one another.

A space mission to Mars detected the presence of argon in its atmosphere. Which type of instrument was in the space mission to Mars that helped detect the presence of argon?

• radio telescope

• reflector telescope

• satellite

• spectroscope

An object moves toward a target 9 feet away. The graph represents the distance the object travels in the first 4 seconds of its motion. Assuming the object continues to move at a constant velocity, how long does it take to reach the target?

• 2 seconds

• 4 seconds

• 6 seconds

• 8 seconds

Which is true about the location of the asthenosphere?

• It is located just above the lithosphere.

• It is located in the lower part of the mantle.

• It is located in the upper part of the mantle.

• It is located in the inner core.