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UPSC PYQPrelims 2025

Civil Services Examination · Question 48

Statement I: In the context of effect of water on rocks, chalk is known as a very permeable rock whereas clay is known as quite an impermeable or least permeable rock. Statement II: Chalk is porous and hence can absorb water. Statement III: Clay is not at all porous. Which one of the following is correct in respect of the above statements?

  1. Both Statement II and Statement III are correct and both of them explain Statement I
  2. Both Statement II and Statement III are correct but only one of them explains Statement I
  3. Only one of the Statements II and III is correct and that explains Statement I
  4. Neither Statement II nor Statement III is correct
Show answer & explanation

Answer: (C) Only one of the Statements II and III is correct and that explains Statement I

Explanation

Chalk's porosity (II) explains its permeability, but clay is actually porous (just not permeable due to small pore size), making III incorrect.