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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 thorough-understanding
Which of the following best explains why most rocks consist of several minerals in varying proportions rather than a single mineral?
  1. A Rocks are formed only from metallic elements, which naturally combine in different ratios.
  2. B Different combinations of elements form under varying physical and chemical conditions, producing different minerals within the same rock.
  3. C Minerals are always evenly mixed across all rock types because they originate from the same source material.
  4. D Only sedimentary rocks contain multiple minerals; igneous and metamorphic rocks consist of a single mineral.
Generated by claude-sonnet-4-6 · 2026-06-26 13:32 · grounding rag
Model Answer

Answer: B

Different combinations of elements form minerals under varying physical and chemical conditions, producing different minerals within the same rock, resulting in most rocks containing several minerals in varying proportions.

Source: What is a mineral?, Chapter 5

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Explanation

The passage directly states: "A particular mineral that will be formed from a certain combination of elements depends upon the physical and chemical conditions under which the material forms." This rules out all other options:

Examiners expect you to pick B and, if asked to justify, quote the physical and chemical conditions reason from the text.

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