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GS Paper IUPSC Prelims 2001
Health & Medicine
Question No. 329Interactive Test Mode
00:00
+2-0.66

Q329. Consider the following statements with reference to the periodic table of chemical elements: 1. Ionisation potential gradually decreases along a period. 2. In a group of elements, electron affinity decreases as the atomic weight increases. 3. In a given period, electronegativity decreases as the atomic number increases. Which of these statement (s) is/are correct?

Consider the following statements with reference to the periodic table of chemical elements:

  1. Ionisation potential gradually decreases along a period.
  2. In a group of elements, electron affinity decreases as the atomic weight increases.
  3. In a given period, electronegativity decreases as the atomic number increases. Which of these statement (s) is/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 2001 • Science and Technology

Correct Answer: Option (B) — 2 only

Concept & Option Breakdown

Standard Reference Verified
  1. Statement 1 is incorrect: Ionisation potential/energy increases along a period from left to right due to increasing nuclear charge and decreasing atomic radius.
  2. Statement 2 is correct: Down a group (as atomic weight/size increases), electron affinity generally decreases due to increased atomic radius and shielding.
  3. Statement 3 is incorrect: Electronegativity increases along a period from left to right as atomic number increases.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2001 (Q329)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — 2 only

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Frequently Asked Questions — UPSC Prelims 2001 Q329

What is the official answer for UPSC Prelims 2001 GS Paper I Question 329 (Science and Technology)?

The official UPSC answer key for this 2001 Science and Technology (Health & Medicine) question is Option (B): "2 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2001 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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