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GS Paper IUPSC Prelims 2000
Health & Medicine
Question No. 333Interactive Test Mode
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Q333. Consider the following statements: Hard water is not suitable for: 1. Drinking 2. washing clothes with soap 3. use in boilers 4. irrigating crops Which of these statements are correct?

Consider the following statements: Hard water is not suitable for:

  1. Drinking
  2. washing clothes with soap
  3. use in boilers
  4. irrigating crops Which of these statements are correct?
Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2000 • Science and Technology

Correct Answer: Option (D) — 1, 2, 3 and 4 only

Concept & Option Breakdown

Standard Reference Verified

Hard water is unsuitable for all listed purposes:

  1. Drinking: Excess mineral content can increase risks of kidney/urinary stones and digestive issues.
  2. Washing with soap: Calcium and magnesium precipitate soap as insoluble scum, wasting detergent and leaving deposits on fabric.
  3. Boilers: High concentrations of $\text{Ca}^{2+}$ and $\text{Mg}^{2+}$ cause boiler scale, reducing heat transfer and causing overheating/damage.
  4. Irrigating crops: High salt/mineral concentration leads to soil salinization and impairs crop absorption.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2000 (Q333)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — 1, 2, 3 and 4 only

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Frequently Asked Questions — UPSC Prelims 2000 Q333

What is the official answer for UPSC Prelims 2000 GS Paper I Question 333 (Science and Technology)?

The official UPSC answer key for this 2000 Science and Technology (Health & Medicine) question is Option (D): "1, 2, 3 and 4 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2000 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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