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Question

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 :

This question was previously asked in
CDS 2 2026 Maths Question Paper (13-Sep-2026)
The correct answer is
1, 2 and 3

Evaluating Earth Origin Theories and Propounders

The question asks to identify correctly matched pairs of theories about the origin of the Earth and their respective propounders.

Analysis of Theory Matches

  • Gaseous Hypothesis: This theory was proposed by Immanuel Kant in 1755. The match with Kant is correct.
  • Binary Star Hypothesis: This hypothesis, focusing on the formation of planetary systems, is often associated with contributions from Russell, Moulton, and Chamberlin. The match with Russell is considered correct in this context.
  • Planetesimal Hypothesis: This theory was developed by Thomas Chamberlin and Forest Moulton. The match with Chamberlin is correct.

Conclusion

Since all three pairs (Gaseous Hypothesis - Kant, Binary Star Hypothesis - Russell, and Planetesimal Hypothesis - Chamberlin) are correctly matched, the correct option includes all three.

Therefore, the option indicating that 1, 2, and 3 are all correctly matched is the correct answer.

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