ISEE Reading Question 164: Answer and Explanation

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Question: 164

3. Which of the following are most likely to be tightly bound by the earth's gravitational field?

  • A. oxygen and helium.
  • B. hydrogen and helium.
  • C. argon and carbon dioxide.
  • D. helium and argon.

Correct Answer: B

Explanation:

The correct answer is (B). According to the passage, heavy gases, such as argon and carbon dioxide, are more tightly bound by the earth's gravitational field. Light gases, such as hydrogen and helium, are less tightly bound.

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