Free Test Prep CLEP-Science-and-Mathematics Exam Questions

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Total 500 Questions | Updated On: Aug 20, 2026

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Question 1

The white blood cells responsible for attacking specific pathogens with antibodies are a type of

A : erythrocyte

B : lymphocyte

C : neutrophil

D : macrophage

E : platelet

Answer: B

Question 2

Let a, b, and c be 3 distinct positive numbers. What can be said about the difference between the mean andthe median of the three numbers?

A : It is always positive or zero.

B : It is less than one-third of the difference between the largest and smallest of the numbers.

C : It is always negative or zero.

D : none of the above.

Answer: B

Question 3

The volume in liters of a 0.2M solution of NaOH needed to neutralize 2 liters of a 0.03M solution of HCl is

A : 0.3 L

B : 0.03 L

C : 0.1 L

D : 0.01 L

E : 0.2 L

Answer: A

Question 4

Guard cells are kidney-shaped cells surrounding the stomata on the underside of leaves. These cellschange their shape according to the amount of water that exists within them. The more water within, themore swollen the guard cells are and the stomata open. When water is sparse the guard cells shrivel andclose the stomata. Recent evidence suggests that there are blue-light receptors on the plasma membranesurface of guard cells that are coupled to potassium (K+) ion channels. K+ ions are normally found in highconcentration outside guard cell membranes when the channels are closed. What mechanism may account for the fact that guard cells are usually open during the day and closed atnight?

A : Photosynthesis uses K+ ions; therefore, lower concentrations of potassium within the leaf drive themovement of K+ into the leaf through the guard cells.

B : The presence of sunlight drives K+ into guard cells, while driving water out of the guard cells andopening the stomata.

C : There is more water in the air during daylight hours than during nighttime hours.

D : K+ ions enter the cell through active transport only when enough water is present.

E : The presence of sunlight opens the K+ ion channels, driving potassium inside, and causing water tofollow by osmosis, swelling the guard cells.

Answer: A

Question 5

Which of the following gives all values of p for which |p + 8| ≥ 12?

A : {p|p ≥ 12}

B : {p|4 ≤ p ≤ 20}

C : {p|−12 ≤ p ≤ 12}

D : {p|−20 ≤ p ≤ 4}

E : {p|p ≤ −20 or p ≥ 4}

Answer: A

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Total 500 Questions | Updated On: Aug 20, 2026

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