Download 3rd Term Exam 8th Grade Study Guide

3rd Term Exam - 8th Grade Science - Rhonda Woullard Carter
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Two plates composed of rock of similar density meet along a convergent boundary. Which statement describes
what will happen where the two plates meet?
A. The plates will rub against each other, C.
causing shearing and creating fault
lines in the interior of the plates
B. The plates will rub against each other, D.
causing one plate to subduct
underneath the other plate and forming
a deep trench along the boundary.
The plates will collide with neither
plate subducting, causing the crust to
pile up and form a mountain range.
The plates will collide, and the
compression will heat the plates,
causing some of the plates to melt and
form volcanic mountains.
2. Fossil fuels are considered nonrenewable resources because they
A. pollute the air.
B. take hundreds of millions of years to form.
C. are in such high demand.
D. burn so quickly.
3. One example of a physical change is
A. baking cookies.
B. burning paper.
C. dissolving salt in water.
D. heating table sugar.
4. Earth has seasons because
A. the temperature of the sun changes.
B. it rotates on its axis.
C. the distance between Earth and the sun changes.
D. its axis is tilted as it moves around the sun.
5. Which of these is an example of a biomass fuel?
A. natural gas
B. coal
C. oil
D. wood
6.
How many electrons does a nickel atom have?
A. 31
B. 14
C. 59
D. 28
7. Which of the following is an advantage of solar energy?
A. It must be collected from a huge area.
B. It will not run out for billions of years.
C. No backup energy sources are needed.
D. It is not available at night.
8. During a tug of war, the rope accelerates toward the left. What is true about the forces acting on the rope?
A. The force toward the left is equal to the force C. The force toward the left is greater than the
toward the right.
B. There can only be a force pulling toward the
left.
force toward the right.
D. The force toward the right is greater than the
force toward the left.
9. Which of these describes the outcome of the collision between oceanic and continental crust?
A. The two portions of crust will slide
C. The two portions of crust will stop
past one another, side by side.
moving.
B. The oceanic crust will subduct beneath D. The continental crust will subduct
the continental crust.
beneath the oceanic crust.
10. The place where two plates come together is known as a
A. rift valley.
B. transform boundary.
C. divergent boundary.
D. convergent boundary.
11.
Type of Star
Main sequence
Red Giant
Supergiant
White Dwarf
Percentage of Total
90.75%
0.50%
< 0.0001%
8.75%
According to the table, the most common type of stars in the Milky Way are
A. main-sequence stars
C. white dwarfs.
B. red giants.
D. supergiants.
12. What kind of weather would a continental tropical air mass that formed over northern Mexico bring to the southwestern
United States?
A. monsoon rains
B. cold and moist
C. hot and dry
D. warm and moist
13. In a chemical reaction, the total mass of the reactants is
A. less than the total mass of the products.
C. unrelated to the total mass of the products.
B. greater than the total mass of the products. D. exactly equal to the total mass of the
products.
14. When a rapidly moving cold air mass overtakes a slow-moving warm air mass, the result is a(n)
A. cold front.
B. occluded front.
C. stationary front.
D. warm front.
15. When the following equation is balanced, what is the coefficient of
H2O?
A. 2
C. 1
4
B.
D. 3
16. The nucleus of an atom has a positive charge because the nucleus
contains
A. mass
C. protons
B. neutrons
D. electrons
17. Cold, dry air affecting the northern United States in winter often comes from
A. maritime polar air masses.
B. continental polar air masses.
C. continental tropical air masses.
D. maritime tropical air masses.
18.
Which letter indicates electromagnetic waves which are visible to the
human eye?
A. A
C. D
B. C
D. B
19. Which graph shows the motion of a person who sat on a park bench for a while and then walked home
at a constant speed?
A. Graph D
B. Graph A
C. Graph C
D. Graph B
20. A girl jumps forward off a boat. According to Newton’s third law of motion, what happens to
the boat?
A. The boat moves backward.
B. The boat moves forward and then backward.
C. The boat also moves forward.
D. The boat remains motionless.
21. When the north end of Earth’s axis is tilted toward the sun, North America will experience
A. more direct rays and shorter days.
B. more indirect rays and longer days.
C. more direct rays and longer days.
D. more indirect rays and shorter days.
22. On average, a snowfall of 20 centimeters would equal a rainfall of
A. 4 centimeters.
B. 3 centimeters.
C. 1 centimeter.
D. 2 centimeters.
23. In a series circuit with three bulbs, adding another bulb will
A. make the nearest bulb brighter.
B. make some of the bulbs dimmer.
C. make all the bulbs dimmer.
D. make all the bulbs brighter.
24. What is Pangaea?
A. another name for continental drift
B. the name of the supercontinent that existed millions of years ago
C. the name of a German scientist
D. the name of an ancient fossil
25. What is the result of using fossil fuels more rapidly than they are formed?
A. The reserves will eventually be used up.
B. The reserves will be refilled more quickly.
C. The reserves will not be affected.
D. The price of fossil fuels will fall.
26. According to the graph, most of the fuel sources used in the United States today are ?
A. solar energy
C. renewable fuels
B. fossil fuels
D. nuclear fuels
27.
Nonmetals are found on the right side of which dark line?
A. III
C. II
B. IV
D. I
28. The evening news reports that modern technology is
going to help reduce the problems of smog and the
greenhouse effect.Which of these is the news report
talking about?
A. using alternatives to fossil fuels
C. building containers for nuclear waste
B. finding replacements for CFCs
D. composting more garbage
29. What is likely to happen to the universe in the future?
A. It will remain the same size.
B. It will expand and then contract.
C. It will contract.
D. It will expand forever.
30.The following maps show a front as it moves east across
the United States.
Which of these describes the weather change that can
be expected for Amarillo, Texas?
A. The cold front will
C. The warm front will
bring cooler
bring warmer
temperatures and snow.
temperatures with light
rain for a few days.
The
warm
front
will
B.
D. The cold front will bring
bring warmer
cooler temperatures with
temperatures with hot
thunderstorms and rain.
air for several days.
31. The electromagnetic spectrum consists of
A. all of the colors of light you can see with your eyes.
B. all of the different types of electromagnetic waves.
C. a band of colors formed when white light passes through a prism.
D. the distance between the crest of one wave and the crest of the next wave.
32. Normal rainfall is slightly acidic, which means its pH must be
A. less than 2.
B. between 5 and 7.
C. between 7 and 9.
D. between 2 and 4.
33. Which equation expresses Newton’s second law of motion?
A. F=m/a
C. F=m+a
B. F=ma
D. F=m-a
34. Which of these describes the lithosphere and the asthenosphere?
A. Both are hot inner layers of earth
C. The lithosphere is rigid and
capable of bending and moving.
immovable, and the asthenosphere is
hot and flowing.
B. Both are hard and rigid layers of earth D. The asthenosphere is rigid and
close to the surface.
immovable, and the lithosphere is hot
and flowing.
35. The formula for speed is speed = distance (d) / time (t)
A cyclist travels 32 km in 2 hours. What is the cyclist's average speed?
A. 32 km/hr
B. 64 km/hr
C. 34 km/hr
D. 16 km/hr