Practice Quiz

NAEP Science Grade 12 - Question List

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26. Which of the following is true for chemical compounds that have been detected elsewhere in the universe?
  1. They have a greater average density than the same compounds found on Earth.
  2. They are composed of the same elements that are found on Earth.
  3. They are less reactive chemically than the same compounds found on Earth.
  4. Those with the greatest molar masses are found furthest away from our solar system.
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27. As observed with special instruments from Earth, the Sun appears in the sky to be slightly larger in January than in July. Which of the following accounts for this observation?
  1. The Earth moves in an orbit that is not circular but is closer to the Sun in January than in July.
  2. The diameter of the Earth is not constant, but bulges slightly at the Equator and contracts slightly during the winter.
  3. The Earth's orbit is not in the same plane as the orbits of the other planets.
  4. The axis of rotation of the Earth is not perpendicular to the plane of its orbit but instead is tilted at an angle.
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28. X -> Y + Z + energy The equation above represents a nuclear decay, in which nucleus X decays into particle Y and nucleus Z and releases energy. Which of the following can explain why energy is released in the decay?
  1. The mass of X is less than the sum of the masses of Y and Z.
  2. The mass of X is less than the difference between the masses of Y and Z.
  3. The mass of X is greater than the sum of the masses of Y and Z.
  4. The mass of X is greater than the difference between the masses of Y and Z.
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29. Carbon-14 has a half-life of approximately 5,700 years. Analysis of the carbon in a piece of charred wood found in an excavation revealed that the carbon has 25 percent of the amount of carbon-14 that is found in the carbon of living trees. Which of the following is most nearly the age of the excavated wood?
  1. 160 years
  2. 5,700 years
  3. 11,400 years
  4. 23,000 years
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30. Which of the following is NOT a part of Darwin's theory of evolution by natural selection?
  1. Individuals in a population vary in many ways.
  2. Some individuals possess features that enable them to survive better than individuals lacking those features.
  3. More offspring are produced than can generally survive.
  4. Changes in an individual's genetic material are usually harmful.
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