UPSC Combined Geo-Scientist 2026
Your complete guide to the UPSC Combined Geo-Scientist Examination 2026 — covering eligibility, exam pattern, syllabus, vacancies, salary, and preparation strategy for Geologist, Geophysicist, Chemist, and Hydrogeologist posts in GSI and CGWB.
1What is UPSC Combined Geo-Scientist Exam?
The UPSC Combined Geo-Scientist Examination (CGSE) is conducted annually by the Union Public Service Commission to recruit highly skilled scientists and officers into Group A and Group B Gazetted services under the Government of India. It is among the most prestigious science-stream examinations in the country.
The two primary recruiting organisations are the Geological Survey of India (GSI) under the Ministry of Mines and the Central Ground Water Board (CGWB) under the Ministry of Jal Shakti. Geo-Scientists in these departments contribute directly to mineral exploration, groundwater mapping, and national resource management.
The selection process is three-staged: Preliminary Examination (Stage I), Main Examination (Stage II), and Personality Test/Interview. Unlike many UPSC exams, there is no fixed attempt limit — candidates are eligible as long as they fall within the age bracket.
2📅 Important Dates 2026
| Event | Date | Status |
|---|---|---|
| Official Notification Released | 3 September 2025 | ✅ Done |
| Online Application Opens | 3 September 2025 | ✅ Done |
| Application Last Date | 23 September 2025 | ✅ Done |
| Prelims Exam (Stage I) | 8 February 2026 | ✅ Done |
| Prelims Result Declared | 2 March 2026 | ✅ Done |
| Mains Exam (Stage II) | 20–21 June 2026 | 🔜 Upcoming |
| Mains Admit Card | ~1 Week Before | 🔜 Upcoming |
| Mains Result | TBN | ⏳ TBN |
| Personality Test / Interview | TBN | ⏳ TBN |
| Final Merit List | TBN | ⏳ TBN |
| Next Cycle Notification (2027 Cycle) | ~September 2026 | ⏳ TBN |
⚠️ TBN = To Be Notified. Mains on June 20–21, 2026 is confirmed. All post-Mains dates are subject to UPSC announcement.
3🎓 Eligibility Criteria
Post-Wise Educational Qualification
Age Relaxation
4📋 Vacancies & Posts 2026
UPSC announced 85 vacancies for the 2026 cycle. Posts are divided across two categories based on the recruiting department.
Category I — Geological Survey of India (GSI), Ministry of Mines
| Post Name | Group | Pay Level |
|---|---|---|
| Geologist | Group A | Level 10 |
| Geophysicist | Group A | Level 10 |
| Scientist 'B' (Geophysics) | Group A | Level 10 |
| Chemist | Group A | Level 10 |
| Scientist 'B' (Chemical) | Group A | Level 10 |
Category II — Central Ground Water Board (CGWB), Ministry of Jal Shakti
| Post Name | Group | Pay Level |
|---|---|---|
| Junior Hydrogeologist (Scientist B) | Group A | Level 10 |
| Geophysicist | Group B | Level 10 |
| Assistant Geophysicist | Group B | Level 7 |
9 vacancies in Category I are reserved for PwBD candidates. Final post-wise breakup may vary — verify from official UPSC notification.
📊 Vacancy Trend: 56 vacancies in 2024 · 85 vacancies in 2025–26 (announced). The exam is highly competitive — roughly 502 candidates qualified for 2026 Mains out of several thousand who appeared for Prelims.
5📝 Exam Pattern 2026
The exam is conducted in three stages. The final merit is based on Mains + Interview marks only; Prelims is qualifying.
Stage I — Preliminary Examination (Qualifying)
✅ Done — Feb 8, 2026| Paper | Subject | Marks | Duration | Type |
|---|---|---|---|---|
| Paper I | General Studies (Common to all) | 100 | 2 Hours | Objective |
| Paper II | Subject-specific (Geology/Geophysics/Chemistry/Hydrogeology) | 300 | 3 Hours | Objective |
Negative marking: ⅓ mark deducted per wrong answer. Prelims marks count towards final merit (not just qualifying).
Stage II — Main Examination
🔜 Jun 20–21, 2026| Paper | Subject | Marks | Duration | Type |
|---|---|---|---|---|
| Paper I | Discipline Paper I (Stream-specific) | 200 | 3 Hours | Descriptive |
| Paper II | Discipline Paper II (Stream-specific) | 200 | 3 Hours | Descriptive |
| Paper III | Discipline Paper III (Stream-specific) | 200 | 3 Hours | Descriptive |
Mains exam centres: Bhopal, Chennai, Delhi, Dispur (Guwahati), Hyderabad, Kolkata, Lucknow, Mumbai, Shimla. No change of centre requests are entertained.
Stage III — Personality Test / Interview
⏳ TBNThe final merit list is prepared on the basis of combined marks in Mains + Interview. Marks from Prelims are NOT counted in the final merit.
6📚 Detailed Syllabus
Candidates appear for stream-specific papers. Below is a high-level syllabus overview. Download the official UPSC notification for the complete topic list.
🪨 Geology Stream
- →Mineralogy: Crystal systems, optical properties, X-ray diffraction
- →Petrology: Igneous, Sedimentary, and Metamorphic rocks
- →Structural Geology & Geotectonics: Deformation, folding, faulting, plate tectonics
- →Stratigraphy & Palaeontology: Indian stratigraphy, fossils, geological time scale
- →Economic Geology: Ore deposits, mineral resources, petroleum geology
- →Remote Sensing & GIS applications in geology
- →General Geology: Earthquakes, volcanoes, geomorphology
🌊 Geophysics Stream
- →Earth structure and composition, Seismology
- →Gravity and Magnetic methods of exploration
- →Electrical and Electromagnetic methods
- →Seismic exploration: Refraction and reflection methods
- →Well logging, Geophysical data interpretation
- →Geodesy, Geomagnetism, Geothermal studies
- →Mathematical methods in geophysics
🧪 Chemistry Stream
- →Inorganic Chemistry: Periodic table, coordination compounds, bioinorganic
- →Organic Chemistry: Stereochemistry, reaction mechanisms, spectroscopy
- →Physical Chemistry: Thermodynamics, kinetics, electrochemistry, quantum chemistry
- →Analytical Chemistry: Chromatography, spectrophotometry, volumetric analysis
- →Environmental Chemistry, Geochemistry
💧 Hydrogeology Stream
- →Hydrological cycle, groundwater occurrence and movement
- →Aquifer types, hydraulic properties, well hydraulics
- →Groundwater exploration, drilling and water well design
- →Groundwater quality, contamination, and remediation
- →Remote sensing for groundwater exploration
- →Hydrogeological mapping and basin studies
The General Studies paper (Prelims Paper I) covers Indian History, Geography, Polity, Economy, Science & Technology, Environment, and Current Affairs.
7💰 Salary & Career Growth
Salary Breakdown
Career Progression
8🖊️ How to Apply
⚠️ The application window for the 2026 cycle closed on September 23, 2025. The next cycle (2027) is expected to open around September 2026.
Go to upsc.gov.in and click on "Apply Online" → "Combined Geo-Scientist Examination 2027".
Provide personal details, educational qualification, preferred stream (Geology/Geophysics/Chemistry/Hydrogeology), and exam centre preferences.
Upload a recent photograph, signature, and any relevant supporting documents as specified in the notification.
₹25 for General/OBC candidates. SC/ST/Female/PwBD candidates are exempted from the fee. Pay through SBI net banking, debit, or credit card.
Review your form before final submission. Download and save the confirmation page with your application number for future reference.
9🗓️ 6-Month Study Plan
- Cover complete M.Sc. level subject syllabus
- Start with standard textbooks for your stream
- Build concept notes for each topic
- Parallel preparation of General Studies basics
- Solve PYQs from last 5–7 years for both stages
- Identify high-weightage topics from PYQ analysis
- Practice answer writing for Mains (descriptive)
- Take 2–3 mock tests per week
- Comprehensive revision of all subject papers
- Focus on weak areas identified from mocks
- Practice time management for 3-hour papers
- Current affairs revision (last 6 months)
- Quick revision of all notes
- Practice interview questions on geoscience topics
- Follow UPSC announcements closely for interview dates
- Mental preparation and health management
10📖 Best Books for UPSC Geo-Scientist
| Book | Author | Subject | Buy |
|---|---|---|---|
| General Geology | A. K. Dey | Geology | Buy |
| Principles of Geomorphology | W. D. Thornbury | Geology | — |
| Applied Geophysics | W. M. Telford et al | Geophysics | Buy |
| Introduction to Geophysics | C. E. Telford | Geophysics | — |
| Inorganic Chemistry | J. D. Lee | Chemistry | Buy |
| Physical Chemistry | P. W. Atkins | Chemistry | Buy |
| Hydrogeology | C. F. Todd | Hydrogeology | — |
| UPSC Geo-Scientist PYQ Compendium | Made Easy / GKP | All Streams | Buy |
11🎯 Free Resources
Official notifications, past papers, admit cards, and results.
Publications, geological maps, and job profiles for Geologists.
Groundwater resources data and Hydrogeologist career information.
Download past Prelims and Mains question papers from the UPSC website.
12💡 Expert Preparation Tips
Prioritise the official UPSC notification syllabus over coaching material — the exam is very closely syllabus-aligned.
The General Studies paper (Paper I) is often the differentiator in Prelims. Do not neglect it in favour of only your subject paper.
For Mains, practice structured answer writing. Diagrams and flow charts carry extra marks in geology and geophysics papers.
Solve at least 7 years of previous year papers thoroughly — UPSC frequently repeats or reworks questions from past cycles.
Form a peer study group with others preparing for the same stream. Discussing complex geological concepts cements understanding quickly.
Stay updated on India's mineral policy, groundwater reports (CGWB), and recent geological discoveries — these often feature in GS Paper I.
13❓ Frequently Asked Questions
What is the UPSC Combined Geo-Scientist Examination 2026?
The UPSC Combined Geo-Scientist Examination (CGSE) 2026 is conducted by the Union Public Service Commission to recruit candidates for Group A and Group B Gazetted Officer posts in the Geological Survey of India (GSI) and Central Ground Water Board (CGWB). The 2026 cycle had its Prelims on February 8, 2026, and Mains are scheduled for June 20–21, 2026.
What is the age limit for UPSC Geo-Scientist 2026?
Candidates must be between 21 and 32 years of age as of January 1, 2026. Age relaxation applies: OBC +3 years, SC/ST +5 years, PwBD +10 years, Ex-Servicemen as per rules.
What qualification is required for UPSC Geo-Scientist?
You need a Master's degree in Geology/Applied Geology (for Geologist posts), Geophysics or Physics (for Geophysicist posts), Chemistry/Applied Chemistry (for Chemist posts), or Hydrogeology/Geology (for Hydrogeologist posts). Requirements are post-specific; check the official notification carefully.
How many vacancies are there in UPSC Geo-Scientist 2026?
85 vacancies were announced for the 2026 cycle, spread across Geologist, Geophysicist, Chemist, and Hydrogeologist (Scientist B) posts in GSI and CGWB. Of these, 9 vacancies in Category I (GSI) are reserved for PwBD candidates.
What is the salary of a UPSC Geo-Scientist?
The entry-level pay is ₹56,100 per month (Pay Level 10, 7th CPC). With HRA, DA, and TA allowances, the gross monthly salary ranges from approximately ₹76,000 to ₹85,000 depending on posting city. In-hand salary is around ₹64,700 after deductions.