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Scientists performed an experiment to determine whether there is a connectionbetween learning ability and food. They took two groups of 20 mice each, allfrom the same purebred strain. The mice were deprived of food for 3 days andthen given a standard learning session in running through a maze. They weretrained by giving them a mild electric shock whenever they took a wrong turn. Immediately after each learning session, one group of mice was fed, but the other was not, A week later, all of the mice were tested to see whether they could still run the maze correctly. The group that had been fed had retained this ability, but the other group had not.

Questions and Answers
  • 1. 
    The probable reason that the scientists used only mice from the same pure-bred strain is so that:
    • A. 

      The mice would all be the same size

    • B. 

      The mice would all be the same color

    • C. 

      The experiment could be repeated with the same mice

    • D. 

      Genetic differences would not affect the outcome of the test

    • E. 

      The experiment wouldn't cost as much

  • 2. 
    Chemical fertilizers stimulate plant growth; but if the concentration is too high, they may damage roots. What precautions concerning chemical fertilizers must a gardener take?
    • A. 

      Use them only on some of his or her plants

    • B. 

      Use only the amount recommended

    • C. 

      Do not apply chemical fertilizers

    • D. 

      Apply as much as possible without damaging roots

    • E. 

      Give the plants only tiny amounts

  • 3. 
    Amniote vertebrates are generally classified into three orders: Reptilia, Ayes (birds), and Mammalia. Of the following, which group of three animals contains one member of each order? 
    • A. 

      Ostrich, American robin, Norway rat

    • B. 

      Beluga whale, black-footed ferret, box turtle

    • C. 

      Timber rattlesnake, fence lizard, leopard

    • D. 

      African lion, sea otter, herring gull

    • E. 

      House sparrow, garter snake, African elephant

  • 4. 
    As temperature rises, solids generally become more soluble in water, but gases become less soluble. If a soft drink contains high concentrations of sugar and carbon dioxide, which of the following may be expected to happen if it is cooled down? 1. Sugar may precipitate out.2. Gas bubbles may form and produce foam.3. Water may evaporate rapidly.
    • A. 

      A only

    • B. 

      B only

    • C. 

      A and B only

    • D. 

      B and C only

    • E. 

      A and C only

  • 5. 
    Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will conduct an electric current. When an electrolyte forms into a solution, it dissolves or dissociates into ions, a process called ionization. If a substance does not ionize, it will not conduct an electric current. Electrolytes include most acids, bases, and salts. Some conductors include hydrogen and sodium chloride, copper sulfate, and potassium nitrate. Substances that are not electrolytes include distilled water, sugar water, and most organic compounds. Which of the following is a nonelectrolyte? 
    • A. 

      HNO 3 (nitric

    • B. 

      HCL (hydrochloric acid)

    • C. 

      H 2 SO 4 (sulfuric acid)

    • D. 

      C 3 H 8 (propane gas)

    • E. 

      NaCl (table salt)

  • 6. 
    Which of the following compounds in the liquid phase can be considered an electrolyte? 
    • A. 

      H 2 O (distilled water)

    • B. 

      CO 2 (carbon dioxide)

    • C. 

      NaCl (sodium chloride)

    • D. 

      CuO (oxidized copper)

    • E. 

      H 2 O 2 (hydrogen peroxide

  • 7. 
    An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT 
    • A. 

      A gas balloon in which the buoyant force is greater than its weight and air resistance.

    • B. 

      A man in a parachute when the air resistance is less than his weight.

    • C. 

      An airplane in horizontal flight when the thrust of the engine is equal to the drag of the air.

    • D. 

      A ball striking a wall, in which the force of the ball on the wall is equal to the force of the wall on the ball.

    • E. 

      A rocket fired straight up, when the engine thrust is equal to the air resistance.

  • 8. 
     Humidity is the amount of water vapor in the air at a given time. At warm temperatures, air can hold more moisture than it can at cold temperatures. Relative humidity is the amount of vapor the air is holding expressed as a percentage of the amount the air is capable of holding. For example, at 86 degrees Fahrenheit, air can hold a maximum of 30.4 grams of water per cubic meter. If the air at the same temperature is holding only 15.2 grams of water, the relative humidity is 50 percent. At the point at which the air becomes saturated (exceeds the level of water vapor it can hold), it releases water vapor in the form of dew or condensation. If the air at 75 degrees's holding the maximum amount of moisture that it can, and the temperature suddenly drops to 60 degrees, what is likely to be the result? 
    • A. 

      The humidity will remain unchanged.

    • B. 

      The relative humidity will decrease.

    • C. 

      Precipitation will be released in the form of rain.

    • D. 

      Precipitation will be released in the form of hail.

    • E. 

      Precipitation will be released in the form of snow.

  • 9. 
    The Smiths have four children, all girls. Their fifth child is a boy. Why did this change occur? 
    • A. 

      The timing of the fertility cycles.

    • B. 

      The mother's contribution of a Y chromosome.

    • C. 

      The "law of averages" finally catching up.

    • D. 

      The father's contribution of a Y chromosome.

  • 10. 
    Air is composed of nitrogen, oxygen, argon, carbon dioxide, and other gasses. How may air be best described? 
    • A. 

      A mixture

    • B. 

      A solution

    • C. 

      An alloy

    • D. 

      An amalgam

  • 11. 
     Table salt - sodium chloride, one of the most common substances occurring in nature - is best classified as which of the following? 
    • A. 

      A compound

    • B. 

      A mixture

    • C. 

      A solution

    • D. 

      An amalg