BSSC Laboratory Assistant Syllabus, Exam Pattern
152 topics across 5 subjects. Every question carries a written explanation.
BSSC's Laboratory Assistant (Prayogshala Sahayak) recruitment is for the research cadre of the Public Health Engineering Department (PHED), the department that runs Bihar's drinking water labs. Advertisement 04/25 offered 143 posts, with applications from 15 May to 14 June 2025.
As of mid-October 2026 the commission had posted no exam date, admit card or result for it.
Last checked against the official notification on .
BSSC Laboratory Assistant Details
Exam Pattern
| Section | Questions |
|---|---|
| General Studies | 35 |
| Science | 75 |
| Quantitative Aptitude and Reasoning | 40 |
150 objective questions in 2 hours, 4 marks each and 1 off for a wrong answer, in Hindi or English. The advertisement calls this a prelim, to be held if applications pass 40,000, with five candidates per vacancy going on to a mains.
Qualifying marks:
| Category | Minimum |
|---|---|
| Unreserved | 40 per cent |
| BC | 36.5 per cent |
| EBC | 34 per cent |
| SC, ST, women, candidates with disability | 32 per cent |
Syllabus
Science is half the paper and follows the Class 12 science syllabus. General Studies covers current events and India and its neighbours, with weight on Bihar. The aptitude section has number system, fractions, percentage, ratio, average, interest and profit and loss, plus verbal and non-verbal reasoning.
Eligibility Criteria
Intermediate (10+2) in Science from a recognised board or university. Age on 1 August 2024, minimum 18:
| Category | Upper age limit |
|---|---|
| Unreserved men | 37 |
| BC and EBC (men and women) | 40 |
| Unreserved women | 40 |
| SC and ST (men and women) | 42 |
| Candidates with disability | 10 years over their category limit |
Vacancies by category:
| Category | Posts | Of which women |
|---|---|---|
| Unreserved | 56 | 20 |
| SC | 22 | 8 |
| ST | 1 | 0 |
| EBC | 27 | 9 |
| BC | 18 | 6 |
| Backward class women | 5 | - |
| EWS | 14 | 5 |
| Total | 143 | 48 |
Salary
Pay Level 4 of the Bihar pay matrix.
How to Apply
Fee ₹540 for unreserved, BC and EBC men and anyone from outside Bihar; ₹135 for Bihar SC and ST, candidates with disability, and Bihar women.
Important Dates
| Event | Date |
|---|---|
| Advertisement 04/25 | 30 Apr 2025 |
| Online applications | 15 May to 14 Jun 2025 |
| Exam | Not announced as of Oct 2026 |
Preparation Tips
With 75 of 150 questions on science, your Class 11 and 12 physics, chemistry and biology matter more than general knowledge here.
Frequently Asked Questions
How many Laboratory Assistant posts are there?
143, all in PHED.
What qualification do I need?
Intermediate in Science.
What is the pay?
Level 4.
When is the exam?
BSSC had not announced it by October 2026.
Computer Awareness (21)
- Computer Fundamentals
- MS Excel
- MS Office
- MS Powerpoint
- MS Word
- Computer Internet
- Computer System Architecture
- Computer Operating System
- Important File Extensions
- Important Abbreviations
- Keyboard Shortcuts
- History of Computers
- Computer Hardware and Software
- Input /Output Devices
- Memory Management
- Computer Languages
- Number System
- Logic Gates
- Computer Network
- Database Management System
- Computer Security
English Language (25)
- Synonyms
- Antonyms
- Double Synonyms
- Homonyms
- One Word Substitution
- Reading Comprehension
- Theme Detection
- Deriving Conclusions from Passages
- Sentence Completion
- Passage Completion
- Fill in the Blanks
- Spotting Errors
- Sentence Improvement
- Passage Correction
- Choose the Correct - Incorrect Sentence
- Reconstruction of Sentence
- Sentences Rearrangement
- Reconstruction of Paragraphs
- Rearrangement of Jumbled Parts
- Word Formation
- Idioms and Phrases
- Active-Passive voice
- Direct-Indirect Speech
- Transformation of Sentences
- Spelling Test
General Awareness / General Knowledge (GK) (23)
- Indian Politics
- Indian History
- Indian Economy
- Important Acts of the Parliament of India
- Honours and Awards
- Indian Geography
- Indian Culture
- World Geography
- Famous Places in India
- Famous Personalities
- Books and Authors
- Sports
- Days and Years
- Inventions
- Highest, Longest, Biggest, Largest, Deepest, Smallest of the World
- General Science
- World Currency
- Country Languages
- Technology
- Physics
- Chemistry
- Biology
- Scientific Names of Plants and Animals
Quantitative Aptitude (49)
- Number System
- H.C.F. & L.C.M.
- Decimal Fractions
- Simplification
- Square Roots & Cube Roots
- Average
- Problems on Numbers
- Problems on Ages
- Surds & Indices
- Percentage
- Operations on Numbers
- Profit & Loss
- Ratio & Proportion
- Partnership
- Chain Rule
- Time & Work
- Pipes & Cistern
- Time & Distance
- Problems on Trains
- Boats & Streams
- Alligation or Mixture
- Simple Interest
- Compound Interest
- Logarithms
- Area
- Volume & Surface Areas
- Mensuration
- Races & Games of Skill
- Calendar
- Clocks
- Stocks & Shares
- Permutations & Combinations
- Probability
- True Discount
- Banker’s Discount
- Heights & Distances
- Odd Man Out & Series
- Algebra
- Divisibility Rules & Remainder Theorem
- Factorials & Power Cycles
- Progressions (A.P., G.P., H.P.)
- Work & Wages
- Set Theory / Venn Diagrams
- Geometry (Lines, Angles, Triangles, Polygons)
- Coordinate Geometry
- Data Interpretation
- Trigonometry
- Statistics (Mean, Median, Mode)
- Arithmetic Operations
Reasoning (34)
- Analogy
- Number Series
- Classification
- Series Completion
- Coding-Decoding
- Input Output
- Inequality
- Blood Relation
- Puzzle Test
- Sequential Output Tracing
- Direction Sense Test
- Linear Seating Arrangement
- Circular Seating Arrangement
- Alphabet Test
- Number, Ranking and Time Sequence Test
- Mathematical Operations
- Logical Sequence of Words
- Arithmetical Reasoning
- Inserting The Missing Character
- Data Sufficiency
- Decision Making
- Assertion and Reason
- Situation Reaction Test
- Verification of Truth of the Statement
- Letter and Symbol Series
- Logic
- Statement - Arguments
- Statement - Assumptions
- Statement - Courses of Action
- Syllogisms
- Statement - Conclusions
- Deriving Conclusions From Passages
- Theme Detection
- Question - Statements
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