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?
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?
3) - Amniotes vertebrates are generally classified into three orders: Reptilian, Ayes (birds), and Mammalian. Of the following, which group of three animals contains one member of each order?
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? A) Sugar may precipitate out. B) Gas bubbles may form and produce foam. C) Water may evaporate rapidly.
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 non-electrolyte?
6) - Which of the following compounds in the liquid phase can be considered an electrolyte?
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?
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 degree' holding the maximum amount of moisture that it can, and the temperature suddenly drops to 60 degrees, what is likely to be the result?
9) - The Smiths have four children, all girls. Their fifth child is a boy. Why did this change occur?
10) - Air is composed of nitrogen, oxygen, argon, carbon dioxide, and other gasses. How may air be best described?
11) - Table salt - sodium chloride, one of the most common substances occurring in nature - is best classified as which of the following?
12) - The earth ______ on its axis from west to east.
13) - During a solar eclipse,
14) - ______ range in size from one to 500 miles in diameter and revolve around the sun.
15) - Ursa Major, Orion, and Andromeda are fixed groups of stars called?
16) - The process by which rocks are broken down into smaller fragments by the atmosphere and other factors in the environment is called?
17) - Planting vegetation, terracing, and strip cropping are common practices employed in the prevention of?
18) - When air high above the earth' surface is cooled below the dew point it is likely to form?
19) - Ground water and surface water become polluted by?
20) - The instrument used to determine air pressure is called a(an)?
21) - Granite, shale, coal, and limestone are commonly known as?
22) - Sedimentation as a method of water purification results in?
23) - Mechanical weathering may occur by means of?
24) - This planet revolves around the sun in an orbit between that of Venus and Mars. It is known to be covered by oceans and some land, and it has but a single moon. The planet is?
25) - Tides result from the pull of gravity exerted upon the earth by?