GRE Sample Test Questions: Reading Comprehension
The questions in the Reading Comprehension section of the GRE require you to complete a sentence by choosing the most suitable word or words for each blank space in the sentence.
The sample passage is followed by two questions pertaining to it. Read the passage and answer the questions based on information stated or implied in the passage. For each question, select one answer choice.
The following passage is an excerpt from Sensory Evaluation: A Practical Handbook by Susan Kemp, Tracey Hollowood, and Joanne Hort (Wiley-Blackwell).
Volatile molecules are sensed by olfactory receptors on the millions of hair-like cilia that cover the nasal epithelium (located in the roof of the nasal cavity). Consequently, for something to have an odour or aroma, volatile molecules must be transported in air to the nose. Volatile molecules enter the nose orthonasally during breathing/sniffing, or retronasally via the back of the throat during eating. There are around 17,000 different volatile compounds. A particular odour may be made up of several volatile compounds, but sometimes particular volatiles (character-impact compounds) can be associated with a particular smell, e.g. iso-amyl acetate and banana/pear drops. Individuals may perceive and/or describe single compounds differently, e.g. hexenol can be described as grass, green, unripe. Similarly, an odour quality may be perceived and/or described in different compounds, e.g. minty is used to describe both menthol and carvone.
Which of the following is not mentioned as a reason that associating an odor with a specific volatile compound may be difficult?
(A) Several volatiles may contribute to producing a specific odor.
(B) People may perceive the odor of compounds differently.
(C) A character-impact compound can be associated with a particular smell.
(D) The odors of different compounds may be perceived or described as having the same quality.
(E) People may describe the odor of compounds differently.
In the context in which it appears, “volatile” most nearly means
(B) Evaporating rapidly
(C) Fleeting; transient
(D) Tending to fluctuate rapidly and regularly
Answers and explanations
The fact that a character-impact compound can be associated with a particular smell would help, not hinder, the ability to associate an odor with a specific volatile compound.
All of the answer choices are definitions of volatile, but because the passage discusses molecules being distributed through the air, evaporating rapidly is the most accurate meaning.