(Download) UPSC MAIN EXAM:2018 - GEOLOGY (Paper-1)

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(Download) CS (MAIN) EXAM:2018 GEOLOGY (Paper I)

Exam Name: CS (MAIN) EXAM:2018 GEOLOGY (Paper I)
Marks: 250
Time Allowed : Three Hours

SECTION-A

Q1. Answer the following questions in about 150 words each: 10x5=50 marks

(a) "Geomorphology is intimately related to tectonics." Explain with suitable examples. 10 marks
(b) What are stream order and mean bifurcation ratio of a drainage basin ? Discuss their significance in the morphometric analysis of a drainage basin. 10 marks
(c) Discuss about the Circum-Pacific volcanic belt. Which five countries have the highest volcanic threat in terms of human loss? 10 marks
(d) Differentiate between True Colour Composite (TCC) and False Colour Composite (FCC). Explain its importance in interpreting remote sensing images. 10 marks
(e) Write about different types of unconformities and their significance. 10 marks

Q2. (a) Describe a desert and discuss how a desert is classified. Discuss the morphology of a dune and conditions favouring formation of different dune types. 20 marks
(b) Describe the different satellite orbits and their relative advantages. 15 marks
(c) What are shear zones ? Explain diagrammatically the transition from brittle fault to ductile shear at depth. 15 marks

Q3. (a) Describe different types of plate boundaries with suitable sketches. 20 marks
(b) Describe 'Spectral Signature' and add a note on the spectral reflectance pattern of rocks, vegetation and water bodies. 15 marks
(c) What are strain markers ? Discuss their significance. 15 marks

Q4. (a) Discuss the mechanism of faulting. 20 marks
(b) Describe the different types of coastal landforms. 15 marks
(c) What are meteorites ? Discuss different types of meteorites. 15 marks

section-B

Q5. Answer the following questions in about 150 words each: 10x5=50 marks

(a) Discuss the modes of fossilization of hard parts of an organism. 10 marks
(b) "Microfossils are superior to megafossils in correlation." Comment on the statement.
(c) State the methods of groundwater exploration. 10 marks
(d) Explain the geological considerations for construction of roads in hilly terrain. 10 marks 10 marks
(e) Discuss the Precambrian-Cambrian boundary problem in the Indian geological context. 10 marks

Q6. (a) Give an account of evolutionary trends in Proboscidea. 20 marks

(b) Write short notes on the following: 15 marks

(i) Lower Gondwana Group
(ii) Karewa Group
(iii) Krol Group

Q7. (a) What are the different types of landslides ? Discuss their controlling measures. 20 marks
(b) Give a brief account of the stratigraphy of Mesozoic rocks of Kachchh. 15 marks
(c) Discuss the significance of fossils in paleoclimatic studies. 15 marks

Q8. (a) Discuss the geological considerations for selection of sites for bridges. 20 marks
(b) What do you understand by spring sanctuaries ? Describe the various types of springs. 15 marks
(c) Discuss the stratigraphy of the Siwalik supergroup and comment on its vertebrate fossils. 15 marks