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1) Scientists performed an experiment to determine whether there is a connection between learning ability and food.They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in running through a maze. They were trained 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. The probable reason that the scientists used only mice from the same pure-bred strain is so that:
genetic differences would not affect the outcome of the test
the experiment could be repeated with the same mice
the experiment wouldn't cost as much
the mice would all be the same color
the mice would all be the same size

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?
Apply as much as possible without damaging roots.
Do not apply chemical fertilizers.
Give the plants only tiny amounts.
Use only the amount recommended.
Use them only on some of his or her plants

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?
African lion, sea otter, herring gull
Beluga whale, black-footed ferret, box turtle
house sparrow, garter snake, African elephant
ostrich, American robin, Norway rat
timber rattlesnake, fence lizard, leopard

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 and B only
A and C only
A only
B and C only
B 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?
C 3 H 8 (propane gas)
H 2 SO 4 (sulfuric acid)
HCL (hydrochloric acid)
HNO 3 (nitric acid)
NaCl (table salt)

6) Which of the following compounds in the liquid phase can be considered an electrolyte?
CO 2 (carbon dioxide)
CuO (oxidized copper)
H 2 O (distilled water)
H 2 O 2 (hydrogen peroxide)
NaCl (sodium chloride)

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 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
a gas balloon in which the buoyant force is greater than its weight and air resistance
a man in a parachute when the air resistance is less than his weight
a rocket fired straight up, when the engine thrust is equal to the air resistance
an airplane in horizontal flight when the thrust of the engine is equal to the drag of the air

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?
Precipitation will be released in the form of hail.
Precipitation will be released in the form of rain.
Precipitation will be released in the form of snow.
The humidity will remain unchanged.
The relative humidity will decrease.

9) The Smiths have four children, all girls. Their fifth child is a boy. Why did this change occur?
the "law of averages" finally catching up.
the conception classes taken by the parents.
the father's contribution of a Y chromosome.
the mother's contribution of a Y chromosome.
the timing of the fertility cycles.

10) Air is composed of nitrogen, oxygen, argon, carbon dioxide, and other gasses. How may air be best described?
a compound
a mixture
a solution
an alloy
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 compound
a mixture
a solution
an alloy
an amalgam

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