Digital PSAT Reading and Writing Practice Question 185: Answer and Explanation

Question: 185

A German patent clerk, Albert Einstein, turned Newtonian mechanics on its head and developed the theory of relativity and the notion of space-time. In the 1920s, scientists studying photographic plates of various star systems took measurements that Edwin Hubble used to demonstrate that the universe is not static at all, but is expanding in all directions, no matter where you might be; this became known as Hubble's law. Hubble's constant-the rate at which the universe is expanding-is currently estimated to be 21 km/s per one million light-years from Earth. This ushered in the notion of the Big Bang as the singular beginning of an expanding space-time and everything in it.

As used in the text, what does the word singular most nearly mean?

  • A. Odd
  • B. Unattached
  • C. Definitive
  • D. Lonely

Correct Answer: C

Explanation:

(C) In the context of the text, singular refers to the type of beginning that the Big Bang was, making definitive most appropriate. While the other words can be stand-ins for "singular," they are not consistent with the context of the text.

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