by Q. Consider the following statements:
UPSC Civil Services Examination (Prelims) 2025 – General Studies Paper I
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 less 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?
(a) Both Statement II and Statement III are correct and both of them explain Statement I
(b) Both Statement II and Statement III are correct but only one of them explains Statement I
(c) Only one of the Statements II and III is correct and that explains Statement I
(d) Neither Statement II nor Statement III is correct
Answer: (c) Only one of the Statements II and III is correct and that explains Statement I
Explanation:
- Chalk is porous and permeable, so Statement II is correct.
- Clay is porous but has low permeability, not completely impermeable, so Statement III is incorrect.
Statement I is correct and is best explained by Statement II alone.
Answer: (c) Only one of the Statements II and III is correct and that explains Statement I
