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OPSC Scientific Officer 2027: preparation

Paper I (English, general awareness, aptitude and reasoning) and Paper II Chemistry Division, unit by unit, with the traps examiners set, faster methods and mock papers.

31 lessons2 testsThe exam 1Getting started 1Paper I: General English 6Paper I: General Awareness, Aptitude and Reasoning 16Paper II: Chemistry (forensic) 9

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A course for the OPSC Scientific Officer (Group-B) examination, Chemistry Division, following the official syllabus.

Paper I is common to all divisions; its lessons are shared with the Assistant Section Officer course where the syllabus overlaps. Paper II covers the forensic chemistry units: analytical methods, spectroscopy, chromatography, organic analysis, biomolecules, drugs, arson and explosives, petroleum, liquor, metals and environmental analysis.

Each lesson covers what gets asked, the key ideas, tricky points, faster methods and worked examples; each paper ends with a mock.

1. The exam

  • The OPSC Scientific Officer exam: pattern and markingLesson

2. Getting started

  • Current affairs: how to prepare and what gets askedLesson

3. Paper I: General English

  • Subject–verb agreement and spotting errorsLesson
  • Tenses and verb formsLesson
  • Prepositions, articles and qualifying wordsLesson
  • Vocabulary: synonyms, antonyms, idioms and phrasesLesson
  • Reading comprehensionLesson
  • Sentence and word rearrangementLesson

4. Paper I: General Awareness, Aptitude and Reasoning

  • The Indian Constitution and polityLesson
  • British rule, the freedom struggle and Odisha's part in itLesson
  • Physical geography of the world, India and OdishaLesson
  • Indian economy: planning, growth, poverty and inflationLesson
  • Science in everyday life and scientific inventionsLesson
  • Odisha at a glance: history, culture and the state todayLesson
  • Human rights and socio-economic developmentLesson
  • Fundamentals of computersLesson
  • Number and alphabet seriesLesson
  • Coding–decodingLesson
  • Direction sense and rankingLesson
  • Arithmetic reasoning and age problemsLesson
  • Percentages, profit and loss, simple and compound interestLesson
  • Ratio, averages, time and work, speed and distanceLesson
  • Data interpretationLesson
  • OPSC Scientific Officer (Group-B) Mock 1: Paper ITest: 100 questions · 90 min

5. Paper II: Chemistry (forensic)

  • Analytical chemistry and statistics of measurement (Unit I)Lesson
  • Spectroscopic techniques (Unit III)Lesson
  • Chromatography and electrophoresis (Unit IV)Lesson
  • Organic analysis, reaction mechanisms and basic organic chemistry (Units I, II, V)Lesson
  • Proteins, carbohydrates, lipids and alkaloids (Unit VI)Lesson
  • Narcotic drugs, psychotropic substances and medicinal chemistry (Units XI–XIV)Lesson
  • Arson, fire debris and explosives (Units XVII–XVIII)Lesson
  • Petroleum products, illicit liquor, metals and environmental analysis (Units VII, IX, X, XV, XVI)Lesson
  • OPSC Scientific Officer (Group-B) Mock 1: Paper II: Chemistry DivisionTest: 150 questions · 150 min