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Social Science (087) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] medium exam-ready
Petroleum is found trapped in the crest of an anticline in folded rock formations. What prevents the oil from rising further or sinking downward? (A) Presence of porous sandstone layers (B) Intervening non-porous rock layers (C) High pressure of natural gas above it (D) Dense water table below
  1. A Presence of porous sandstone layers
  2. B Intervening non-porous rock layers
  3. C High pressure of natural gas above it
  4. D Dense water table below
Generated by claude-sonnet-4-6 · 2026-06-26 13:32 · grounding rag
Model Answer

(B) Intervening non-porous rock layers

The oil is trapped in the crest of the anticline (upfold); the oil-bearing layer is porous limestone or sandstone, but intervening non-porous layers above and below prevent the oil from rising or sinking.

Source: Minerals and Energy Resources, Conventional Sources of Energy (Petroleum)

Explanation

The passage explicitly states: "The oil is prevented from rising or sinking by intervening non-porous layers." Options A, C, and D are either partially correct concepts misapplied or not stated in the text. Always quote the textbook language directly for such factual MCQs.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.