1. The correct answer is (A). Radiation cannot pass through lead.

2. The correct answer is (D). The cornea, a transparent tissue, forms the outer coat of the eyeball, covering the iris and pupil.

1. The correct answer is (B). To find percent of increase, subtract the original figure from the new figure. Then divide the amount of change by the original figure. $380 - $350 = $30; $30 / $350 = .0857 (which is approximately 8.5 percent).

2. The correct answer is (A). 192 / 24 = 8 gallons

1. The correct answer is (B). Secure means safe, as in not exposed to danger.

2. The correct answer is (D). Villainous means wicked or evil.

1. The correct answer is (B). One chief justice plus eight associate justices equals nine justices.

2. The correct answer is (D). The first three options are not supported by the passage. The correct answer is supported by the second sentence, which states, "With the migration of man to various climates, ever-new adjustments to the food supply and to the climate became necessary."

1. The correct answer is (B). 6 + 8 + 4 + 12 = 30 marbles
12 / 30 = .40 = 2/5

2. The correct answer is (D). (3 + 2) (6 - 2) (7 + 1) = (4 + 4)(x)
                  (5) (4) (8) = 8x
                             8x = 160
                               x = 20 = 8 + 12

1. The correct answer is (C). The farad is a unit of capacitance. Most capacitors used in electronics are small and their capacitance is only a tiny fraction of a farad. One microfarad is one millionth of a farad.

2. The correct answer is (C). The number on the wires is in reverse order to the amount of current they can carry. No. 12 is the smallest of the wires.

1. The correct answer is (B). The ignition coil in a gasoline engine builds up a low-voltage current supplied by the battery to the high voltage needed by the spark plugs.

2. The correct answer is (D). A lathe is a machine that rotates a piece of wood to create a uniform circular design when the wood is cut with a chisel. A baseball bat is the only round object.

1. The correct answer is (C). Because of the way the gears are meshed, both gear 1 and gear 3 will move in the opposite direction of gear 2.

1. The correct answer is (C).