Geology

UPSC Geology 2022 — Paper I

All 8 questions from UPSC Civil Services Mains Geology 2022 Paper I (400 marks total). Every stem reproduced in full, with directive-word analysis, marks, word limits, and answer-approach pointers.

8Questions
400Total marks
2022Year
Paper IPaper

Topics covered

Convergent plate boundaries, GIS data types, drainage patterns, drag folds, unconformities (1)Continental drift, plate tectonics, aerial photography, linear structures (1)Geomorphic landforms, Earth's interior structure, stereographic projection (1)Shear zone structures, remote sensing platforms, soil formation (1)Biozonation, index fossils, Blaini Formation, saline water intrusion, engineering geology (1)Hominidae evolution, Kashmir Valley stratigraphy, groundwater investigation (1)Singhbhum Craton, taphonomy, landslides (1)Groundwater quality, Lower Gondwana flora, chronostratigraphy (1)

A

Q1
50M 150w Compulsory explain Convergent plate boundaries, GIS data types, drainage patterns, drag folds, unconformities

Answer the following questions in about 150 words each: (a) Explain 'convergent plate boundary' with suitable examples. Add a note about the characteristics of earthquakes at the convergent boundary. (10 marks) (b) What is the difference between Raster and Vector data? Describe their characteristics as well as their advantages and disadvantages. (10 marks) (c) Illustrate and describe any five types of drainage pattern and give an account of the factors that influence drainage pattern development. (10 marks) (d) Explain through neat sketches what drag folds are, and how they can be used to determine major fold structure. (10 marks) (e) Describe the structures showing gap in stratigraphic sequence caused by erosion and non-depositions. (10 marks)

हिंदी में पढ़ें

निम्नलिखित प्रश्नों में से प्रत्येक का लगभग 150 शब्दों में उत्तर दीजिए : (a) 'अभिसरण प्लेट सीमा' को उपयुक्त उदाहरण सहित समझाइए। अभिसारी सीमा पर भूकंपों की विशेषताओं के बारे में टिप्पणी कीजिए। (10 अंक) (b) रेखापुंज (रैस्टर) तथा वेक्टर डेटा में क्या अंतर है? इनकी विशेषताओं के साथ-साथ अनुकूलताओं एवं प्रतिकूलताओं पर प्रकाश डालिए। (10 अंक) (c) अपवाह प्रतिरूप के किन्हीं पाँच प्रकारों का सचित्र वर्णन कीजिए तथा अपवाह प्रतिरूप विकास को प्रभावित करने वाले कारकों का उल्लेख कीजिए। (10 अंक) (d) सुस्पष्ट चित्रण से कर्षण वलन को समझाइए। यह किस प्रकार से मुख्य वलन संरचना के निर्धारण में सहायक होता है? (10 अंक) (e) अपरदन एवं अनिशेषण के कारण स्तरीय विन्यासक्रम में अंतराल को प्रदर्शित करने वाली संरचनाओं का वर्णन कीजिए। (10 अंक)

Answer approach & key points

Framework: Geology Paper 1: Define > Process > Field/Petrographic Evidence > Indian Example. (a) explain: definition/context > points in order > small example > short close | (b) compare: paired headings or table > key differences > significance > conclusion | (c) describe: define > structure or process in order > labelled diagram > significance | (d) explain: definition/context > points in order > small example > short close | (e) describe: define > structure or process in order > labelled diagram > significance Full marks: All parts with Indian examples, precise terminology, and clear diagrams

  • Define convergent plate boundary
  • Provide suitable examples (e.g., Himalaya, Andes)
  • Note characteristics of earthquakes at boundary
  • Link to Indian context (e.g., Himalayan orogenic belt)
  • Define Raster data
  • Define Vector data
  • List characteristics of both
  • State advantages and disadvantages
  • Describe five drainage pattern types
  • Provide illustrations/sketches
  • Explain factors influencing development
  • Link to Indian river systems
  • Define drag folds
  • Provide neat sketches
  • Explain how they determine major fold structure
  • Link to Indian fold belts
  • Define stratigraphic gap
  • Describe erosion-caused structures
  • Describe non-deposition structures
  • Link to Indian stratigraphy
Q2
50M discuss Continental drift, plate tectonics, aerial photography, linear structures

(a) Discuss in detail the notion of 'continental drift' and the theories of plate tectonics as they relate to palaeogeography. (20 marks) (b) Explain the principles of aerial photography and how it is classified. (15 marks) (c) Illustrate and describe the linear structures of deformed rocks. (15 marks)

हिंदी में पढ़ें

(a) 'महाद्वीपीय विस्थापन' की अवधारणा तथा प्लेट विवर्तनिकी के सिद्धांतों की पुराभौगोलिक संबंधों के संदर्भ में विस्तार से चर्चा कीजिए। (20 अंक) (b) वायव फोटोग्राफी के सिद्धांतों की व्याख्या करते हुए इसके वर्गीकरण पर प्रकाश डालिए। (15 अंक) (c) विक्षिप्त शैलों की रेखीय संरचना का सचित्र वर्णन कीजिए। (15 अंक)

Answer approach & key points

Framework: Geology Paper 1: Define > Process > Evidence > Indian Example. (a) discuss: intro > 3-4 dimensions > example > balanced close | (b) explain: definition/context > points in order > small example > short close | (c) describe: define > structure or process in order > labelled diagram > significance Full marks: Precise definitions, clear mechanisms, specific Indian examples, labelled diagrams, and accurate terminology.

  • Wegener's evidence: fit, fossils, paleoclimate, geology
  • Mechanism: convection, seafloor spreading, subduction
  • Palaeogeographic reconstruction: Pangaea, Gondwana, Laurasia
  • Indian example: Gondwana breakup, Deccan Traps, Himalayan collision
  • Principles: perspective, scale, overlap, stereo-pair
  • Classification: oblique vs vertical
  • Classification: low, medium, high altitude
  • Application in geological mapping
Q3
50M describe Geomorphic landforms, Earth's interior structure, stereographic projection

(a) Describe the geomorphic landforms produced by structural, weathering, erosional and depositional processes. Give four examples of each process. (20 marks) (b) Illustrate the discontinuities in the Earth's interior and discuss the mechanical and compositional layering of the Earth. (15 marks) (c) Illustrate the principles of stereographic projection. How are the 'pi' and 'beta' diagrams useful to analyze fold structure? (15 marks)

हिंदी में पढ़ें

(a) भू-संरचना, अपक्षय, अपरदन एवं निक्षेपण प्रक्रिया से निर्मित भू-आकृतिक स्थलरूपों का वर्णन कीजिए। प्रत्येक प्रक्रिया के चार उदाहरण दीजिए। (20 अंक) (b) भू-आंतरिक असांतत्य का सचित्र वर्णन कीजिए तथा भौतिक एवं संघट्य परतों की व्याख्या कीजिए। (15 अंक) (c) त्रिविम प्रक्षेप के सिद्धांतों का सचित्र वर्णन कीजिए। वलन संरचना के विश्लेषण में किस प्रकार 'पाई' तथा 'बीटा' प्रक्षेप रेखाचित्र सहायक होते हैं? (15 अंक)

Answer approach & key points

Framework: Geology Paper 1: Define > Process > Field/Petrographic Evidence > Indian Example. (a) describe: define > structure or process in order > labelled diagram > significance | (b) explain: definition/context > points in order > small example > short close | (c) explain: definition/context > points in order > small example > short close Full marks: Precise definitions, 4+ examples per process, clear diagrams, specific Indian examples, and accurate technical terminology.

  • Four distinct examples for structural landforms
  • Four distinct examples for weathering landforms
  • Four distinct examples for erosional landforms
  • Four distinct examples for depositional landforms
  • Identification of Moho, Gutenberg, and Lehmann discontinuities
  • Distinction between compositional layers (Crust, Mantle, Core)
  • Distinction between mechanical layers (Lithosphere, Asthenosphere)
  • Diagram showing depth and discontinuities
Q4
50M illustrate Shear zone structures, remote sensing platforms, soil formation

(a) Illustrate the common brittle-ductile shear zone structures. Using the stress ellipsoid, deduce the mechanism of faults. (20 marks) (b) Describe the various platforms and sensors used in Remote Sensing. (15 marks) (c) What are the weathering stages of soil formation? Discuss the active and passive factors of soil formation. (15 marks)

हिंदी में पढ़ें

(a) भंगुर-तन्य अपरूपण क्षेत्र की साधारण संरचनाओं को उदाहरण सहित स्पष्ट कीजिए। प्रतिबल दीर्घवृत्तज का उपयोग कर भंश क्रियाविधि को दर्शाइए। (20 अंक) (b) सुदूर संवेदन में उपयोग किए जाने वाले विभिन्न प्लेटफॉर्म तथा संवेदक का वर्णन कीजिए। (15 अंक) (c) मृदा निर्माण के अपक्षय चरण क्या हैं? मृदा निर्माण के सक्रिय एवं निष्क्रिय कारकों का वर्णन कीजिए। (15 अंक)

Answer approach & key points

Framework: Geology Paper 1: Define > Process > Field/Petrographic Evidence > Indian Example. (a) explain: definition/context > points in order > small example > short close | (b) describe: define > structure or process in order > labelled diagram > significance | (c) discuss: intro > 3-4 dimensions > example > balanced close Full marks: Precise structural sketches, named Indian examples, clear causal chains, and accurate technical terminology.

  • Sketch brittle-ductile shear zone structures
  • Draw stress ellipsoid with principal axes
  • Deduce faulting mechanism from ellipsoid
  • Link shear sense to fault type
  • Define remote sensing platforms
  • List active and passive sensors
  • Describe sensor types (optical, radar)
  • Mention spatial and spectral resolution
  • List weathering stages (physical, chemical, biological)
  • Define active factors (climate, organisms)
  • Define passive factors (parent material, time)
  • Link weathering to soil profile development

B

Q5
50M 150w Compulsory explain Biozonation, index fossils, Blaini Formation, saline water intrusion, engineering geology

Answer the following questions in about 150 words each: (a) Diagrammatically explain the types of biozonation. (10 marks) (b) Define index fossil and discuss its significance. Give the examples of index fossils of Palaeozoic Era. (10 marks) (c) Describe the lithostratigraphy, palaeoenvironment and age of Blaini Formation. (10 marks) (d) What are the different sources for saline water intrusion in aquifers? Describe Ghyben-Herzberg relation. (10 marks) (e) What are the geological investigations required for civil engineering projects of dams, reservoirs and tunnels? (10 marks)

हिंदी में पढ़ें

निम्नलिखित प्रश्नों में से प्रत्येक का लगभग 150 शब्दों में उत्तर दीजिए : (a) जीव अनुक्षेत्र वर्गीकरण के प्रकारों का सचित्र वर्णन कीजिए। (10 अंक) (b) सूचक जीवाश्म को परिभाषित करते हुए उसके महत्व पर प्रकाश डालिए। पुराजीवी महाकल्प के सूचक जीवाश्मों के उदाहरण दीजिए। (10 अंक) (c) ब्लैनी शैलसमूह के अश्मस्तरीकी, पुरावातावरण एवं काल का वर्णन कीजिए। (10 अंक) (d) जलभर में खारे पानी के अंतर्वेशन के लिए विभिन्न स्रोत क्या हैं? घ्यबेन-हर्जबर्ग सम्बन्ध का वर्णन कीजिए। (10 अंक) (e) बाँध, जलाशय एवं सुरंग की सिविल इंजीनियरिंग परियोजना के लिए आवश्यक भूवैज्ञानिक अन्वेषण क्या हैं? (10 अंक)

Answer approach & key points

Framework: Geology Paper 1: Define > Process > Field/Petrographic Evidence > Indian Example. (a) explain: definition/context > points in order > small example > short close | (b) define: precise definition > the distinguishing feature > one example | (c) describe: define > structure or process in order > labelled diagram > significance | (d) describe: define > structure or process in order > labelled diagram > significance | (e) highlight: name the salient points > one line of substance each > close Full marks: Precise definitions, correct diagrams, named Indian examples, and clear causal chains.

  • Diagram showing range zones (total, acme, etc.)
  • Diagram showing interval zones (concurrency, association)
  • Clear distinction between range and interval zones
  • Labels for taxa and stratigraphic boundaries
  • Precise definition of index fossil
  • Significance: geochronology and correlation
  • Palaeozoic examples: Trilobites, Graptolites, Brachiopods
  • Mention of wide geographic distribution
  • Lithology: basal diamictite (tilloid), shales and quartzites, upper diamictite and pink cap dolomite
  • Palaeoenvironment: glacio-marine with ice-rafted debris, cap carbonate on deglaciation
  • Age: terminal Cryogenian (Marinoan, about 635 Ma)
  • Location: Lesser Himalaya (Mussoorie and Krol belts), between Jaunsar/Simla and Infra-Krol
  • Sources: Over-pumping, sea-level rise, coastal proximity
  • Ghyben-Herzberg relation: z = 40h (interface depth 40 times water-table height above sea level)
  • Explanation of freshwater-saltwater interface
  • Assumption of hydrostatic equilibrium
  • Dams: Foundation rock quality, seepage potential
  • Reservoirs: Seismicity, leakage, slope stability
  • Tunnels: Rock mass rating, groundwater pressure
  • Methods: Boreholes, geophysics, mapping
Q6
50M elucidate Hominidae evolution, Kashmir Valley stratigraphy, groundwater investigation

(a) Elucidate the evolutionary trend of Hominidae with examples of Indian occurrence. (20 marks) (b) Describe the Palaeozoic sequence of Kashmir Valley with fossils content. (15 marks) (c) Describe the surface investigation methods of groundwater. (15 marks)

हिंदी में पढ़ें

(a) होमिनिडी की विकासीय प्रवृत्ति का वर्णन कीजिए तथा इनकी उपलब्धता भारतीय उदाहरणों के साथ बताइए। (20 अंक) (b) कश्मीर घाटी के पुराजीवी महाकल्प अनुक्रम का जीवाश्मों सहित वर्णन कीजिए। (15 अंक) (c) भूमजल की सतह अन्वेषण विधियों का वर्णन कीजिए। (15 अंक)

Answer approach & key points

Framework: Geology, Paper 1. (a) explain: definition/context > points in order > small example > short close | (b) describe: define > structure or process in order > labelled diagram > significance | (c) describe: define > structure or process in order > labelled diagram > significance Full marks: Comprehensive, accurate, with specific examples and diagrams.

  • Chronological sequence of Hominidae evolution
  • Morphological changes (bipedalism, brain size)
  • Named Indian fossil occurrences
  • Stratigraphic age of Indian sites
  • Stratigraphic sequence of Palaeozoic rocks
  • Fossil content of each unit
  • Age of formations
  • Lithological description
Q7
50M describe Singhbhum Craton, taphonomy, landslides

(a) Describe the stratigraphy of Singhbhum Craton and discuss its economic significance. (20 marks) (b) Discuss the effects on dead organism after burial. (15 marks) (c) Describe the types of landslide, and discuss its factors and mitigation measures. (15 marks)

हिंदी में पढ़ें

(a) सिंहभूम क्रेटन की स्तरीकी का वर्णन कीजिए तथा उसके आर्थिक महत्व पर प्रकाश डालिए। (20 अंक) (b) मृत जीव पर शवाधान के बाद होने वाले प्रभावों की विवेचना कीजिए। (15 अंक) (c) विभिन्न प्रकार के भूस्खलन का वर्णन करते हुए इसके कारकों एवं शमन करने वाले उपायों की विवेचना कीजिए। (15 अंक)

Answer approach & key points

Framework: Geology Paper 1: Define > Process > Field/Petrographic Evidence > Indian Example. (a) describe: define > structure or process in order > labelled diagram > significance | (b) discuss: intro > 3-4 dimensions > example > balanced close | (c) describe: define > structure or process in order > labelled diagram > significance Full marks: Precise stratigraphy, specific mineralization, clear diagenetic processes, and detailed landslide classification with Indian examples.

  • Identify Singhbhum as an Archaean craton with OMG/OMTG basement, Singhbhum Granite and IOG greenstone-BIF belts
  • List key units: OMG, OMTG, Singhbhum Granite, IOG, Dhanjori, Singhbhum Group, Dalma, Kolhan, Newer Dolerite
  • Link stratigraphy to iron ore (IOG BIF) and to copper-uranium of the Singhbhum Shear Zone
  • Mention specific economic minerals: hematite iron ore, chromite, copper, uranium, kyanite, manganese
  • Define diagenesis and taphonomy
  • Describe physical changes: compaction, cementation
  • Describe chemical changes: mineral replacement, dissolution
  • Mention the role of groundwater and pressure
  • Classify landslides (e.g., rockfall, slide, flow)
  • List causative factors: slope, water, vegetation, seismicity
  • Describe mitigation measures: drainage, retaining walls, afforestation
  • Mention the role of geology in landslide susceptibility
Q8
50M describe Groundwater quality, Lower Gondwana flora, chronostratigraphy

(a) Give an account of interpretation of groundwater chemical quality through various graphic representation methods. (20 marks) (b) Describe the Lower Gondwana flora of India and their significance. (15 marks) (c) Describe the chronostratigraphic classification of geological time scale. (15 marks)

हिंदी में पढ़ें

(a) भूमजल रासायनिक गुणवत्ता की विभिन्न प्रकार के आलेखी निरूपण द्वारा विवेचना कीजिए। (20 अंक) (b) भारत के निम्न गोंडवाना वनस्पति-जात एवं उनके महत्व की विवेचना कीजिए। (15 अंक) (c) भूवैज्ञानिक काल मापन के कालस्तरीकीय वर्गीकरण को स्पष्ट कीजिए। (15 अंक)

Answer approach & key points

Framework: Geology Paper 1: Define > Process > Field/Petrographic Evidence > Indian Example. (a) account for: state the phenomenon > the causes in order of weight > conclusion | (b) describe: define > structure or process in order > labelled diagram > significance | (c) describe: define > structure or process in order > labelled diagram > significance Full marks: Precise diagrams, named Indian examples, clear causal links, correct terminology.

  • Piper trilinear diagram interpretation
  • Durov diagram components
  • Stiff diagram for water type
  • Link to hydrogeochemical processes
  • Key genera (Glossopteris, Gangamopteris)
  • Stratigraphic range (Talchir-Karharbari-Barakar-Raniganj, Permian)
  • Significance for Gondwana reconstruction
  • Paleoclimatic implications
  • Hierarchy: Eon > Era > Period > Epoch
  • Current Eon (Phanerozoic) divisions
  • Key boundary markers (mass extinctions)
  • Standard ICS time scale structure

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