Free CLEP Natural Science Exam Practice Questions


Each of the following groups of questions consists of five lettered terms followed by a list of numbered phrases or sentences. For each numbered phrase or sentence, select the choice that is most clearly related to it. Each choice may be used once, more than once, or not at all.

Questions 1 – 4

  1. He
  2. Li
  3. Br
  4. Ca
  5. Au
___ 1. The element with the largest ionization energy
___ 2. The element that exists in all three basic states of matter at standard temperature and pressure
___ 3. This element is the most malleable and ductile of the known pure metalsĀ 
___ 4. The most stable element


Questions 5 – 8

  1. Star
  2. Planet
  3. Dwarf planet
  4. Plutoid
  5. Asteroid
___ 5. Orbits the Sun at a greater axis than NeptuneĀ 
___ 6. Largest body to revolve around a star
___ 7. Undergoes nuclear fusion in its core
___ 8. Also known as planetoids; most are located between Jupiter and Mars



Each of the questions or incomplete statements below is followed by five possible answers or completions. Select the one that is best for each question.

9. Which of the following is a carbohydrate found in a plant’s primary cell wall?
  1. Lignin
  2. Chitin
  3. Cellulose
  4. Plastid
  5. Peptidoglycan
10. Sea turtles are large organisms with long life spans if they reach adulthood. They produce large numbers of offspring at once, but do not tend to their offspring. These characteristics of sea turtles are best described as:
  1. Altruistic
  2. R-selected
  3. K-selected
  4. Neither r-selected nor k-selected
  5. Both r-selected and k-selected