The Union Public Service Commission (UPSC) conducts the Combined Geo-Scientist Examination (CGSE) annually to recruit specialists into premier scientific organizations, including the Geological Survey of India (GSI) and the Central Ground Water Board (CGWB). To excel in this multi-tiered examination, candidates must align their preparation with the latest syllabus and test structure.
UPSC Combined Geo-Scientist Exam Scheme & Marking Pattern
The UPSC Combined Geo-Scientist Examination 2027 consists of three successive stages: a Computer-evaluated Preliminary test, a Conventional Main examination, and a Personality Test.
| Stage | Examination Type | Papers | Total Marks | Duration | Negative Marking |
| Stage-I (Prelims) | Objective (MCQ) | Paper-I: General Studies (100 Marks) Paper-II: Domain Paper (300 Marks) | 400 Marks | 2 Hours each | 1/3rd ($0.33$) mark penalty |
| Stage-II (Mains) | Conventional (Descriptive) | 3 Stream-Specific Papers (200 Marks each) | 600 Marks | 3 Hours each | Deduction for irrelevant markings |
| Stage-III (Interview) | Personality Test | Board Interview assessing domain suitability | 200 Marks | — | No minimum pass mark |
Stage-I: Preliminary Examination Syllabus
Paper-I is common across all streams, testing general scientific aptitude and general knowledge at the graduate level. Paper-II covers core technical disciplines aligned with postgraduate curricula.
1. Paper-I: General Studies (100 Marks)
- Current events of national and international significance.
- History of India and the Indian National Movement.
- Physical, social, and economic geography of India and the world.
- Indian polity and governance, including the Constitution, Panchayati Raj, and public policy.
- Economic and social development, sustainable growth, poverty alleviation, and inclusion.
- Environmental ecology, climate change, biodiversity, and general science fundamentals.
2. Paper-II: Stream-Specific Subjects (300 Marks)
- Geology / Hydrogeology: Physical Geology, Structural Geology, Mineralogy, Igneous and Metamorphic Petrology, Sedimentology, Paleontology, Stratigraphy, Economic Geology, and fundamental Hydrogeology.
- Geophysics: Solid Earth Geophysics, Mathematical Methods, Electromagnetism, Geophysical Prospecting, Remote Sensing, Thermodynamics, and Nuclear Physics/Radiometry.
- Chemistry: Chemical Periodicity, Chemical Bonding, Acids and Bases, Quantitative Inorganic Analysis, Kinetic Theory, Chemical Thermodynamics, Solutions, Electrochemistry, Stereochemistry, and Organic Reaction Mechanisms.
Stage-II: Main Examination Syllabus
The descriptive examination evaluates in-depth theoretical and analytical knowledge through three conventional papers. Non-programmable pocket calculators are permitted during Stage-II.
| Stream | Paper-I | Paper-II | Paper-III |
Geologist | Physical Geology, Remote Sensing, Structural Geology, Sedimentology, Paleontology, Stratigraphy. | Mineralogy, Geochemistry, Isotope Geology, Igneous/Metamorphic Petrology, Geodynamics. | Economic Geology, Indian Mineral Deposits, Mineral Exploration, Fuel/Engineering Geology, Environmental Geology. |
Geophysicist | Solid Earth Geophysics, Earthquake Seismology, Mathematical Methods, Inversion, Electrodynamics. | Potential Field Methods (Gravity & Magnetic), Electrical/EM Methods, Seismic Prospecting, Well Logging, Classical Mechanics. | Radiometric & Airborne Geophysics, Marine Geophysics, Signal Processing, Remote Sensing, Solid State Physics, Quantum Mechanics. |
Chemist | Inorganic Solids, Coordination Compounds, Titrimetry, Gravimetric Analysis, Organometallics, Nuclear Chemistry. | Gaseous State, Solids, Chemical Kinetics, Catalysis, Electrochemistry, Quantum Chemistry, Spectroscopy, Photochemistry. | Analytical Chemistry (Errors, Chromatography, Spectrometry, AAS, X-ray methods) & Advanced Organic Chemistry. |
Hydrogeologist | Geology Paper-I topics. | Geology Paper-II topics. | Groundwater Occurrence, Flow Dynamics, Well Hydraulics, Groundwater Exploration, Water Quality & Basin Management. |
Strategic Preparation Advice
- Balance Both Papers in Stage-I: While Paper-II carries 300 marks, Paper-I (General Studies) acts as a critical differentiator for clearing the screening cutoff.
- Practice Descriptive Answer-Writing: Stage-II demands clarity, structured presentation, and diagrams; focus on concise explanations and standard scientific notations.
- Integrate Numerical Problem-Solving: For Geophysics and Physical Chemistry, practice derivation steps and numerical calculation using non-programmable calculators.
- Review Previous Years’ Question Papers: Solve past UPSC papers to analyze recurring geological formations, chemical reaction mechanisms, and geophysical inversion problems.
