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Examination-2025 BGSP-A-GLG
GEOLOGY
PAPER—I
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-A-GLG/61 1 ۲۶
SECTION—A
( Compulsory Section )
1. Describe the following in brief with illustrations, wherever necessary :
(a)
(b)
(c)
(0)
(e)
(9)
(h)
0
2. (a)
(b)
3. (a)
(b)
(0
Differences between Specular and Lambertian reflection
Various causes that were responsible for the glaciation on the Earth’s surface
Geometry of boudinage structure
Conjugate and polyclinical folds
Lowstand systems tract in sequence stratigraphy
Solution structures
Principles of magnetostratigraphy
Stratigraphic classification of Upper Assam
Conditions suitable for preservation and fossilization of soft parts of organisms
Evolution of suture patterns in ammonites
SECTION—B
Attempt any one question
Describe any five different processes of chemical weathering.
Explain the various interactions of electromagnetic radiation coming from the
Sun with the atmosphere of the Earth. Discuss its impact on remote sensing
images.
With the help of neat diagrams, describe any five erosional landforms created
by wind.
Describe any five different isotopic/radiometric dating techniques used to
determine the age of the Earth.
Explain the differences between kinetic and radiant temperature and their
interrelationship. What temperature do remote sensing sensors measure, and
what are the factors influencing that temperature?
BGSP-A-GLG/61 2
15
15
10
10
10
4. (a)
(b)
(৮)
(0
धि
धि
(0
8. (0)
(b)
SECTION—C
Attempt any one question
Explain the Mohr’s stress diagram and its relevance in interpreting stress
conditions in rocks.
Discuss in detail the time relationship between crystallization and deformation
of mineral grains.
Differentiate a dome from a doubly plunging fold and a fault surface from an
unconformable surface.
Elucidate the mechanics and causes of folding.
Discuss the geometrical relation of joints with folds and faults. Add a note on
joint surface markings.
SECTION—D
Attempt any one question
Describe the mechanical structures of sedimentary rocks with neat sketches.
Describe the classification of conglomerates and breccias.
What are the deformation and apposition fabric in sediments? Elucidate the
gravel, sand and till fabric.
Describe the rift, foreland, interior and pull-apart basins with examples and
suitable sketches.
Explain the relationship between kurtosis and sedimentary particle size.
SECTION—E
Attempt any one question
Describe the shell morphology of brachiopods with neat and labelled sketches.
Add a note on their biostratigraphic applications during Paleozoic.
Describe the morphology of spores and pollens with suitable sketches and its
applications in geology.
15
15
10
10
10
15
15
10
10
10
15
15
BGSP-A-GLG/61 3 [ P:T.0.
9. (a) Describe the evolutionary history of Proboscidea with suitable illustrations. 10
(b) Write the methodology of separation of foraminifera from the sediments.
Comment on the applications of foraminifera in geological studies. 10
(c) Discuss the various hypotheses proposed to explain the causes of mass
extinctions on the Earth. Enlist the major mass extinctions in geological time. 10
SECTION—F
Attempt any one question
10. (a) Discuss the tectonic evolution and stratigraphic classification of Singhbhum
Craton. Give reasons for the localized occurrences of economic mineral
deposits within Singhbhum Craton. 15
(b) Describe the Mesozoic stratigraphic classification of Narmada Valley and
comment on the lithology, fossils content and depositional environment. 15
11. (a) Describe the tectonic evolution of Eastern Ghat Mobile Belt (EGMB). 10
(b) Enlist the characteristic features of Proterozoic sedimentary basins of India.
Comment on the depositional environment of the Vindhyan Supergroup. 10
(c) Draw the outline and tectonic trend of the cratons on the map of India
(provided in the QCA Booklet). Enlist the major economic mineral deposits from
each craton. ৷ 10
kkk
BGSP-A-GLG/61 4 25SS—624
