CDS 2026 (I) General Knowledge, question 66

Topic: Geography

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Q66

Which of the following pairs of theories about origin of the Earth and their propounders is/are correctly matched ?

  1. Gaseous Hypothesis : Kant

  2. Binary Star Hypothesis : Russell

  3. Planetesimal Hypothesis : Chamberlin

Select the answer using the codes given below :

  1. (a) 1 only
  2. (b) 2 and 3 only
  3. (c) 1 and 3 only
  4. (d) 1, 2 and 3Correct answer

Solution.

Answer: (d) 1, 2 and 3

  1. Kant proposed the gaseous (nebular) hypothesis.
  2. Russell proposed the binary star hypothesis.
  3. Chamberlin, with Moulton, proposed the planetesimal hypothesis, so all three pairs are correct.