UPSC Geo Scientist Syllabus 2027: Prelims & Mains Topics
The UPSC Geo Scientist syllabus 2027 is long, technical and stream-specific. A Geology aspirant and a Chemistry aspirant share only one paper, General Studies, and even that paper has its own qualifying cut-off.
The syllabus is published in the official notice for the Combined Geo-Scientist Examination 2027 (Examination Notice No. 01/2027-GEOL). The Prelims is on 10 January 2027 and the Mains on 19 and 20 June 2027.
This guide breaks the syllabus down paper by paper for every stream: Geology/Hydrogeology, Geophysics and Chemistry. It then shows how to use the syllabus to plan your preparation.
UPSC Geo Scientist Syllabus 2027
Stage | Paper | Standard | Type | Marks |
|---|---|---|---|---|
Prelims | Paper I: General Studies (all streams) | Science graduate | Objective (OMR) | 100 |
Prelims | Paper II: Stream subject | Approximately M.Sc. | Objective (OMR) | 300 |
Mains | Papers I, II, III: Stream subject | Approximately M.Sc. | Descriptive | 200 each |
Interview | Personality Test | No set syllabus | Oral | 200 |
Three rules from the notice shape how you should read this syllabus:
Questions test fundamentals. UPSC says questions will test your grasp of the basics of each subject at M.Sc. level.
There is no practical exam in any subject.
All papers are in English only, and Mains answers must also be written in English.
UPSC Geo Scientist Syllabus PDF
The complete syllabus is in Appendix I of the official notification. Download it from the UPSC website: Combined Geo-Scientist Examination 2027 notice (PDF). Keep a printed copy and tick off each unit as you finish it.
UPSC Geo Scientist Prelims Syllabus 2027
Paper I: General Studies (Common for All Streams)
Area | What It Covers |
|---|---|
Current events | National and international developments |
History | History of India and the Indian National Movement |
Geography | Physical, social and economic geography of India and the world |
Polity and governance | Constitution, political system, Panchayati Raj, public policy, rights issues |
Economic and social development | Sustainable development, poverty, inclusion, demographics, social sector initiatives |
Environment | Ecology, biodiversity and climate change, at a general (non-specialist) level |
General Science | Everyday science at graduate level |
Paper II: Geology/Hydrogeology
Unit | Key Topics |
|---|---|
Physical Geology | Uniformitarianism, Earth's origin and interior, earthquakes and volcanoes, plate tectonics, isostasy, landforms, weathering |
Structural Geology | Stress and strain, folds and faults, Mohr's circle, shear zones, toposheets, V-rules, stereographic projection |
Mineralogy | Symmetry, Bravais lattices, silicate structures, optical properties of rock-forming minerals |
Igneous Petrology | Magma types, IUGS classification, phase diagrams, differentiation, petrogenesis of granite, basalt and alkaline rocks |
Metamorphic Petrology | Types and controls of metamorphism, textures, zones, isograds and facies |
Sedimentology | Sedimentary textures and structures, sandstone and carbonate classification, depositional environments |
Palaeontology | Fossilisation, invertebrate groups, evolution of horses and hominids, microfossils, Gondwana flora |
Stratigraphy | Stratigraphic principles, Indian cratons, Proterozoic mobile belts, Cuddapah and Vindhyan basins, Phanerozoic sequences of India |
Economic Geology | Ore-forming processes, coal and petroleum formation, major Indian mineral and hydrocarbon deposits |
Hydrogeology | Aquifer properties, Darcy's Law, groundwater chemistry, isotopes, artificial recharge |
Paper II: Geophysics
Unit | Key Topics |
|---|---|
Solid Earth Geophysics | Earth's shape, gravity and magnetic fields, rock magnetism, elastic waves, Earth's interior, earthquakes and seismicity |
Mathematical Methods | Vector calculus, matrices, gravitational potential, conservation laws, relativity basics, inverse theory, probability, differential equations, numerical methods |
Electromagnetism | Electrostatics and magnetostatics, Laplace's equation, Maxwell's equations, EM waves in different media |
Geophysical Prospecting | Gravity, magnetic, electrical, EM and well-logging methods; seismic principles; signals, Fourier and Laplace transforms, correlation |
Remote Sensing and Thermodynamics | EM spectrum, radiation laws (Stefan-Boltzmann, Wien, Planck), laws of thermodynamics |
Nuclear Physics and Radiometry | Nuclear properties, radioactive decay, radiation detectors, atomic spectra |
Paper II: Chemistry
Unit | Key Topics |
|---|---|
Chemical Periodicity | Hydrogen-atom Schrödinger equation, periodic trends, s, p, d and f-block chemistry |
Bonding and Structure | Ionic, covalent and coordinate bonding, lattice energy, Fajan's rules, VBT and MOT, coordination isomerism |
Acids and Bases | Ionic equilibrium, pH, buffers, Henderson's equation |
Quantitative Inorganic Analysis | Volumetric analysis, types of titrations and indicators |
Gaseous State | Kinetic theory, Maxwell-Boltzmann distribution, mean free path |
Thermodynamics and Equilibrium | First and second laws, Joule-Thomson effect, Gibbs and Helmholtz functions |
Solutions | Colligative properties, Raoult's Law |
Electrochemistry | Conductance, Kohlrausch's law, Debye-Hückel theory, transport number |
Organic Chemistry | Resonance, reactive intermediates, stereochemistry, SN1/SN2 and E1/E2 reactions, aromatic substitution, rearrangements |
UPSC Geo Scientist Mains Syllabus 2027
Each Mains paper carries 200 marks and lasts 3 hours. The paper combination depends on your post.
Post | Paper I | Paper II | Paper III |
|---|---|---|---|
Geologist / Assistant Geologist | Geology | Geology | Geology |
Scientist 'B' (Hydrogeology) / Assistant Hydrogeologist | Geology | Geology | Hydrogeology |
Geophysics posts | Geophysics | Geophysics | Geophysics |
Chemistry posts | Chemistry | Chemistry | Chemistry |
Note that CGWB hydrogeology candidates write Hydrogeology as Paper III, replacing Geology Paper III. Some websites list it as a separate "Hydrogeology Paper I", which is misleading.
Geology Mains Syllabus
Paper | Sections |
|---|---|
Paper I | A. Physical geology and remote sensing (landforms, ocean floor, LANDSAT/IRS, aerial photos) · |
Paper II | A. Mineralogy (crystal classes, optical mineralogy) |
Paper III | A. Economic geology (ore genesis, deposit types, fluid inclusions) |
Hydrogeology Mains Syllabus (Paper III for CGWB Hydrogeology Posts)
Section | Key Topics |
|---|---|
A. Occurrence and distribution | Water cycle, aquifer types, porosity, specific yield, springs |
B. Movement and well hydraulics | Darcy's Law in isotropic and anisotropic media, hydraulic conductivity, transmissivity |
C. Wells and groundwater levels | Steady and unsteady flow to wells, well construction, pumping and slug tests, land subsidence |
D. Groundwater exploration | Remote sensing, resistivity, seismic and borehole logging methods |
E. Quality and management | Rock-water interaction, water quality standards, sea-water intrusion, plume migration, artificial recharge |
Geophysics Mains Syllabus
Each Geophysics paper has two parts. Part A covers geophysics, and Part B covers core M.Sc. Physics.
Paper | Part A (Geophysics) | Part B (Physics) |
|---|---|---|
Paper I | Solid earth geophysics, earthquake seismology, mathematical methods in geophysics, geophysical inversion | Mathematical physics, electrodynamics, electromagnetic theory, atmospheric and space physics (including ionosphere and GPS) |
Paper II | Gravity and magnetic methods, electrical and EM methods (including IP, magnetotellurics and GPR), seismic prospecting, borehole geophysics | Classical mechanics, thermodynamics and statistical physics, atomic and molecular physics, nuclear and particle physics |
Paper III | Radiometric and airborne geophysics, marine geophysics, signal processing, remote sensing and geohydrology | Solid state physics and electronics, lasers, digital electronics, radar and satellite communication, quantum mechanics |
Chemistry Mains Syllabus
Paper | Key Units |
|---|---|
Paper I (Inorganic) | Inorganic solids, coordination chemistry and crystal field theory, acid-base, redox and complexometric titrations, gravimetric analysis, organo metallics, nuclear chemistry, d- and f-block elements |
Paper II (Physical) | Real gases, solid state, thermodynamics and equilibrium, chemical kinetics and catalysis, electrochemistry, quantum chemistry, spectroscopy, photochemistry |
Paper III (Analytical and Organic) | Part A: errors and statistics, chromatography and solvent extraction, UV-Vis, IR and AAS, thermal and X-ray methods, ICP spectroscopy, analysis of geological materials · Part B: carbenes and nitrenes, addition and carbonyl reactions, oxidation and reduction, pericyclic reactions, IR, UV, NMR and mass spectrometry |
UPSC Geo Scientist Personality Test Syllabus
The interview has no prescribed syllabus. According to the notice, the board looks at leadership, initiative, intellectual curiosity, tact, integrity and aptitude for field life. In practice, prepare to discuss your M.Sc. subjects, your dissertation and fieldwork, the work of GSI and CGWB, and current earth-science issues.
UPSC Geo Scientist Exam Pattern at a Glance
Stage | Papers | Duration | Marks |
|---|---|---|---|
Prelims | GS (100) + Stream Paper II (300) | 2 hours each | 400 |
Mains | Three stream papers | 3 hours each | 600 |
Interview | Personality Test | – | 200 |
The Prelims carries one-third negative marking and does not allow calculators. Marks from all three stages count towards final merit.
How to Use the Syllabus to Prepare
A syllabus this long needs a plan, not a cover-to-cover reading. These observations come directly from how the syllabus is written.
1. Treat Prelims and Mains as One Syllabus
Every Prelims Paper II unit reappears in the Mains in greater depth. If you study stratigraphy or seismic methods to Mains depth now, the Prelims questions become easier. The only exception is General Studies, which appears only in the Prelims.
2. Prioritise India-Specific Content
The Geology syllabus repeatedly names Indian examples: the Dharwar, Singhbhum and Aravalli cratons, the Cuddapah and Vindhyan basins, the Siwaliks, Indian mineral and hydrocarbon deposits, and the large igneous provinces of India. Geophysics names the seismotectonics of India. Generic textbooks rarely cover these well, so build dedicated notes from Indian references.
3. Geophysics Aspirants Must Revise Core Physics
Half of each Geophysics Mains paper (Part B) is pure M.Sc. Physics, including quantum mechanics, statistical physics, electrodynamics and electronics. A candidate from an applied geophysics background should budget serious time for this.
4. Chemistry Has a Geological Twist
Chemistry Paper III includes the analysis of geological materials, such as dolomite, bauxite and pyrolusite, as well as alloys, petroleum products and coal. These topics reflect the laboratory work of a GSI Chemist.
5. Do Not Neglect General Studies
Paper I has its own minimum qualifying mark. Daily current affairs, basic polity, and environment topics usually give the best return for the time spent.
6. Practise Against the Syllabus
After each topic, take a short timed test. Mark the syllabus units where your accuracy stays low and revisit those first.
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