Grade 8 Science Part 2

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Grade 8 SciencePart 2

• 2005 Released Test

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26. Which of the following is a truestatement
about the magnetic fieldbetween two magnets

• A. The south pole of one magnet is attracted
  to both poles of the other magnet.
• B. The north pole of one magnet is attracted
  to the north pole of the other magnet.
• C. The south pole of one magnet is attracted
  to the north pole of the other magnet.
• D. The south pole of one magnet is attracted
  to the south pole of the other magnet.

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27. What most likely happened to species that
are found in the fossil record but have no living
members

• A. They had offspring of a different
  species.
• B. They mutated to other species.
• C. They never really existed.
• D. They became extinct.

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28. According to the chart on which planet
would a ball fall the fastest

• A. Saturn
• B. Neptune
• C. Jupiter
• D. Earth

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29. In the chemical formula for ammonia NH3
what does the subscript 3 represent

• A. The number of hydrogen atoms in each
• molecule of ammonia
• B. The number of nitrogen and hydrogen atoms
  in each molecule of ammonia
• C. The number of ammonia molecules that will
  bond together
• D. The number of nitrogen atoms in each
• molecule of ammonia

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30. Which of these is a result of burning fossil
fuels

• A. Acid rain
• B. Clean water
• C. Hydroelectric energy
• D. Solar energy

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31. Which of the following causes the Sun to
appear to set

• A. The rotation of the Sun
• B. The revolution of the Earth
• C. The revolution of the Sun
• D. The rotation of the Earth

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32. An electric light bulb is hot to the touch
because

• A. its chemical reactions produce heat
• B. evaporation causes an object to heat
  up
• C. its magnetic field produces a large
  amount of heat
• D. current passing through it produces
  heat

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33. In a food chain the numbers of each type of
population are usually in a relatively stable
combination. If humans interfered by spraying an
insecticide to kill the insects what would be
the next thing that would happen

• A. The number of snakes would increase.
• B. The number of grass plants would
• decrease.
• C. The number of songbirds would
• decrease.
• D. The number of hawks would increase.

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34. Which instrument would mostaccurately and
precisely determinethe mass of a toy car

• A. A triple-beam balance
• B. A graduated cylinder
• C. A spring scale
• D. An electronic light meter

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35. Organisms that absorb nutrients from dead
plants and animals are called

• A. producers
• B. herbivores
• C. decomposers
• D. carnivores

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36. The diagram below shows a block from the
periodic table. The number six represents the

• A. number of valence electrons in the
  element carbon
• B. number of neutrons in the element
  carbon
• C. atomic mass of the element
  carbon
• D. atomic number of the element carbon

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37. Each student in a science class of 25
conducts the same experiment. One student gathers
all the data from her classmates and summarizes
the results. She compares the data she personally
recorded with the class data. Which of these
might indicate to her that herresults are valid

• A. Many other students recorded data similar to
  hers.
• B. Another student in her class reached a
  different conclusion.
• C. The same experiment was repeated two years
  in a row.
• D. Three other classes performed the same
• experiment.

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38. Thrips are tiny insects that can easily be
seen on roses. The thrip population changes shown
in the graph above are probably caused by

• A. increased use of insecticides
• B. seasonal changes
• C. a major climatic change
• D. increases in human population

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39. A mixture of iron filings and sulfur can
easily be separated by

• A. heating the mixture
• B. using a magnet
• C. performing a chemical reaction
• D. placing the mixture in water

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40. A student designs and builds a 11000 scale
model of the Mt. Fuji volcano in Japan. Since Mt.
Fuji is about 3800 m high what is the height of
his scale model

• A. 3800 m
• B. 380 m
• C. 0.38 m
• D. 3.8 m

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41. According to the data in the table which
sample of matter is most likely a metal

• A. 1
• B. 2
• C. 3
• D. 4

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42. When plants undergo photosynthesis they
produce

• A. oxygen
• B. carbon dioxide
• C. hydrogen
• D. nitrogen

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43. Expansion joints such as these are put on
bridges because the concrete expands and
contracts. This happens when

• A. the concrete gets wet
• B. the amount of light changes
• C. the temperature changes
• D. chemicals get on
• the concrete

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44. How far offshore is the deepest point of the
ocean on this graph

• A. 240 km
• B. 160 km
• C. 5000 m
• D. 0 m

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45. A burning candle is in the process of
transforming

• A. chemical energy into light and heat
• B. heat energy into chemical energy
• C. chemical energy into mechanical energy
• D. chemical energy into nuclear energy

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46. Mendel proposed that traits observed in pea
plants resulted from acombination of factors
inherited from each parent. His description of
these factors can be considered the first
scientific definition of the role of

• A. ribosomes
• B. meiosis
• C. cell nuclei
• D. genes

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47. Which of the organisms in a forest ecosystem
is an example of a producer

• A. Oak trees
• B. Squirrels
• C. Black bears
• D. Bacteria

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48. Botanists often use leaves to identify
plants. Which trait of the leaves shown would be
most useful in identifying the plants they came
from

• A. Color of the leaf
• B. Function of the leaf
• C. Arrangement of leaves on a stem
• D. Presence or absence of veins

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49. A tapeworm lives in human intestines
absorbing the nutrients that would normally be
absorbed by the person. This eventually causes
the person health problems. The relationship
between the tapeworm and the human is

• A. herbivore/omnivore
• B. herbivore/omnivore
• C. parasite/host
• D. predator/prey

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50. Of the states of matter gas is the only
state that

• A. has a definite shape
• B. is highly compressible
• C. has mass
• D. is fluid

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Thats All Folks!