(Paper) IAS Mains Previous Year Paper Geology (1990)
Paper: IAS Mains Previous Year Paper Geology (1990)
Paper-I- Geology-1990 (Mains)
SECTION A
1. Explain any three of the following in about 200 words each:
(a) Petro fabric analysis as a tool in structural studies
(b) Drainage patterns
(c) Origin of continents and oceans
(d) Products of volcanic eruptions
2. Write a short essay on ‘Geomorphic features of the Indian sub-continent’.
3. (a) What are joints? How do they differ from faults? Give a genetic and geometrical classification of joints.
(b) How does the repetition of beds differ due to folding and faulting?
4. Distinguish between the members of the following pairs:
(a) Bedding Plane and Cleavage
(b) Esker and Kame
(c) Horst and Graben
(d) P-waves and S-waves
(e) Solution valley and Glacial valley
SECTION B
5. Answer any three of the following in about 200 words:
(a) Extinction of Dinosaurs
(b) Evidences of first marine transgression in South India during mesozoic and related stratigraphic unit / units.
(c) Permian-Triassic Boundary
(d) Microfossils and their significance
6. Give in a tabular form the stratigraphic succession, lithology and characteristic fossils of the Siwalik System. Discuss the conditions of deposition and climatic factors during that period.
7. Draw a neat, full-page-size labelled diagram in illustrate the external morphology of:
(a) a Gastropod
(b) Trilobita Name two genera, from each of the above groups from Indian stratigraphy mentioning their stratigraphic horizon.
8. Discuss the following:
(a) Gondwana flora climatic vicissitudes and stratigraphic classification of the supergroup
(b) Recent developments in Dharwarian stratigraphy
Paper-II- Geology-1990 (Mains)
SECTION A
1. Write notes on any three of the following in about 200 words each:
(a) International system of crystallographic solution
(b) Use of stereographic projections to represent symmetry
(c) Biaxial indicatrix
(d) Ionic radii coordination number
2. Discuss in detail application of X-rays for crystal studies.
3. What is the difference between pleochroic and interference colors ? Explain how these colors are produced in minerals.
4. Give an account of the physical, chemical and optical properties of pyroxene group of minerals.
SECTION B
5. Write notes on any three of the following in about 200 words each:
(a) Facies and grades of metamorphism
(b) Metallogenetic epochs
(c) Bowen’s Reaction in Principle
(d) Ore dressing and benefication
6. Give a brief account of the oil and gas fields of India with particular reference to post-independence discoveries.
7. Give an account of textures present in sedimentary rocks and discuss their significance.
8. Discuss in detail the use of aerial photographs in geological investigations.
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