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Rocks

1 UPSC Prelims MCQs tagged "Rocks". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

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  1. Consider the following statements: Statement I: In the context of effect of water on…

    Consider the following statements: 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. ABoth Statement II and Statement III are correct and both of them explain Statement I
    2. BBoth Statement II and Statement III are correct but only one of them explains Statement I
    3. COnly one of the Statements II and III is correct and that explains Statement I
    4. DNeither Statement II nor Statement III is correct
    Answer and explanation

    Correct answer: C

    Statement I: Correct Chalk is permeable (water passes easily); clay is impermeable (water passes poorly).

    Statement II: Correct Chalk is porous, with many small holes that hold water, making it permeable.

    Statement III: Incorrect Clay is porous but with very tiny pores that restrict water flow; it is impermeable but not non-porous.

    Correct Answer: Only Statements I and II are correct; Statement II explains Statement I.

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    Geography UPSC 2025 Hard