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Combined Geo-Scientist (Main)
Examination-2025 BGSP-C-GLG
GEOLOGY
PAPER—III
Time Allowed : Three Hours Maximum Marks : 200
QUESTION PAPER SPECIFIC INSTRUCTIONS
Please read each of the following instructions carefully
before attempting questions
There are ELEVEN questions divided under SIX Sections.
Candidate has to attempt SIX questions in all.
The ONLY question in Section—A is compulsory.
Out of the remaining TEN questions, the candidate has to attempt FIVE, choosing ONE
from each of the other Sections B, C, D, E and F.
The number of marks carried by a question/part is indicated against it.
Unless otherwise mentioned, symbols, abbreviations and notations have their usual
standard meanings.
Neat sketches are to be drawn to illustrate answers, wherever required. They shall be
drawn in the space provided for answering the question itself.
Wherever required, graphs/tables are to be drawn on the Question-cum-Answer Booklet
itself.
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of
a question shall be counted even if attempted partly.
Any page or portion of the page left blank in the Question-cum-Answer Booklet must
be clearly struck off.
Answers must be written in ENGLISH only.
BGSP-C-GLG/62 1 ۲۶۸۳0.
SECTION—A
( Compulsory Section )
1. Describe the following in brief with neat labelled diagrams, wherever necessary :
(a)
(b)
(6)
(0)
ഭു
1
(9)
(h)
8
0
2. (a)
(b)
(b)
(0)
Ilmenite-magnetite exsolution lamellae formation mechanism 5
Physical and optical characters that differentiate pyrolusite from
cryptomelane-psilomelane 5
Conservation of minerals 5
Status of India w.r.t. mica deposits and production 5
Causes of non-significant and lateral anomalies 5
Significance of black shales in metallogenesis 5
Secondary migration of oil 5
Main attributes of the coal of Wardha Basin 5
Earth’s radiation budget 5
Suitable geological formations for carbon capture and storage 5
SECTION—B
Attempt any one question
What are the main chemical reactions involved in oxidation and supergene
sulphide enrichment processes? How do pH and Eh affect the stability of
sulphide minerals? 15
What is the role of iron in gossan? How are the various types of limonite
boxworks useful? 15
Discuss the various forms of syngenetic and epigenetic ore bodies. 10
Discuss the various types of replacement textures and their paragenetic
significance. 10
Describe the origin and evolution of Zawar Pb-Zn mineralization in Rajasthan. 10
BGSP-C-GLG/62 2
4. (a)
(b)
(b)
(०
6. (८)
(b)
7. (a)
(৮)
(0
SECTION—C
Attempt any one question
Describe the mode of occurrence and distribution of gold deposits in India.
Write a note on gold mineralization in Bundelkhand Craton.
Which are three major limestone-producing States of India? Briefly describe
the geology and mode of occurrence of these deposits.
Which is the major diamond-producing geological formation in India?
Describe the geological setting and depositional history of these deposits.
Briefly describe the mineral deposits associated with ‘Singhbhum Shear
Zone (SSZ)’.
What is ‘National Mineral Policy (NMP)’? Give its objectives and features.
Discuss the impact, benefits and significance of NMP.
SECTION—D
Attempt any one question
Give an idea about syngenetic and epigenetic types of secondary dispersion
patterns. Add a note on their origin.
Explain, with the help of neat suitable diagram, about various forms and
interpretation of secondary dispersion patterns.
How are mineralogical and stratigraphic guides useful in mineral exploration?
What are the main differences between self-potential and induced polarization
methods? Add a note on their applications in search of base metal
mineralization.
Compare and contrast the advantages and disadvantages of diamond and
churn drills.
15
15
10
10
10
15
15
10
10
10
BGSP-C-GLG/62 3 [ P.T.O.
8. (a)
(b)
9. (a)
(b)
(0
10. (a)
(b)
11. (a)
(b)
(6)
SECTION—E
Attempt any one question
Evaluate the geological factors which govern the type of dam to be constructed
across a river. What are the unique features of Tehri Dam situated in seismic
hazardous zone?
List the sedimentary basins of India where prospects of finding hydrocarbons
are higher. Discuss such prospects for Ganga Basin.
Elaborate the origin and mode of occurrence of common minerals found
in coal. How do these minerals affect the grade and use of coal?
Discuss the geotechnical investigations required for locating the stable
foundations for abutments and piers of bridges.
What are the different types of sediment-hosted uranium deposits? Describe
the origin of 1০01] front’ uranium ores.
SECTION—F
Attempt any one question
What are the types and causes of floods? How does a river morphology
affect the flooding of its channel?
Discuss the causes and effects of global climate change. How do you place
it in the Earth’s geological history?
Discuss the environmental impacts of mining and hydropower projects.
Describe the major sources of groundwater pollution.
What are the geochemical and geohydrological precursors of earthquake?
How do you measure the intensity of an earthquake?
kkk
15
15
10
10
10
15
15
10
10
10
BGSP-C-GLG/62 4 25SS—624
