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Topic

Indicators

Asked 2 times in CDS over 8 years (2014–2022), peaking in 2014.
2
PYQs
1
Exams
2
Years active
2014–2022
Span
2014
Peak
2/2
Answers
📅 Full chronological timeline →

Key insights

  • Most tested in CDS — 2 of 2 PYQs
  • Most asked in 2014
  • Recurs across 2 years (2014–2022)

Across exams

CDS · 2

How the concept evolved

114
122
Long-running — most appearances (1 of 2) predate 2016, and it still returns.

Related concepts

Ideas UPSC tests alongside this one — keep exploring.
Acids and bases ×1

Sample questions

You've seen the pattern — here are a few of the actual PYQs.
CDS2022
Which one of the following living organisms gives litmus ?
  1. A Protozoa
  2. B Virus
  3. C Lichen ✓
  4. D Saccharomyces
✓ Correct answer: (C)
Science & Technology › Biology & Health
CDS2014

Which of the following solutions will not change the colour of blue litmus paper to red?

  1. Acid solution
  2. Base solution
  3. Common salt solution

Select the correct answer using the code given below.

  1. A 1 and 3
  2. B 2 and 3 ✓
  3. C 1 only
  4. D 2 only
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry

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