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Explain any three… (Class 10 Social Science 2025, Q28a)

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Social ScienceCBSE Class 10 · Board exam 2025, set 32/6/1 · 3 marks · Short answer

CBSE Class 10 Social Science 2025: question 28(a)

Set in the CBSE Class 10 board exam of 2025, paper 32/6/1, section C, question 28(a), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q28(a) · 3 marks · Short answerWater Resources

Explain any three factors responsible for water pollution.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 32/6/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Think about which industries release liquid waste.

Hint 2

Besides factories, farm chemicals also reach water.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Industrial waste and effluents, both organic and inorganic, are discharged into rivers. The main culprits are paper, pulp, chemical, textile and dyeing, petroleum, tannery and electroplating industries.

    1 mark

  2. These industries release dyes, detergents, acids, salts, heavy metals like lead and mercury, pesticides, fertilisers and plastics into water bodies.

    1 mark

  3. Solid wastes such as fly ash, phospho-gypsum and iron and steel slag add to the pollution of water.

    1 mark

Answer: Industrial effluents, chemicals and heavy metals, and solid wastes like fly ash and slag pollute water.

Where the marks are

  • Industrial effluents discharged in rivers, naming industries (1 mark)
  • Chemicals, heavy metals, pesticides, fertilisers entering water (1 mark)
  • Solid wastes such as fly ash and slag (1 mark)

Revise the chapter

  • Chapter: Water Resources (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Water Resources, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 32/6/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.