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Indian Forest Services (Main)
Examination-2025 DJSM-U-GELY
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 EIGHT questions in all, out of which FIVE are to be attempted.
Questions no. 1 and & are compulsory. Out of the remaining SIX questions, THREE are
to be attempted selecting at least ONE question from each of the two Sections A and B.
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:
All questions carry equal marks. The number of marks carried by a question/part is
indicated against it.
Neat sketches may be drawn, wherever required.
Answers must be written in ENGLISH only.
DJSM-U-GELY 1
Ql. (a)
(b)
(८)
(d)
(e)
Q2. (2)
(b)
(८)
Q3. (8)
(nig) 299४19८ 1 ¦ 1910;
೭0೩೪೮110 A
Explain Orogeny and Epeirogeny.
Illustrate Plunging and Reclined folds.
Explain the Karst cycle.
An aerial mapping camera with a focal length of 120 mm is mounted on
an aircraft flying at an altitude of 4800 meters above mean terrain
level. The sensor of the camera has pixel size 12 um and dimensions
36 mm x 24 mm. Calculate the ground resolution and ground coverage
area at the nadir.
A rounded mineral grain of radius 4 cm got deformed. The lengthening
of the grain perpendicular to stress became 10 cm. Find the extension
and magnitude of change in length.
Explain the remote sensing techniques which are useful in groundwater
and mineral explorations.
Illustrate oceanic topographies with their characteristics. Add a critical
note on which part of oceanic topography is most suitable for the
development of coral reefs.
Describe fault structures with the help of stress ellipsoids. How can one
recognize the fault in the field ?
What is the magnitude of an earthquake ? What are the different
magnitude scales used to measure earthquakes ? How is the magnitude
of the earthquake related to earthquake intensity ?
DJSM-U-GELY 2
10
15
15
(b)
(૦)
Q4. (a)
(b)
(c)
What is Strain ? How does the shape and size of a mineral grain within
a rock change during deformation ?
Describe the primary and secondary landforms and discuss their
interrelationship.
What are the different hypotheses of Isostasy ? Explain each hypothesis
with the help of suitable diagrams.
What are joints in a rock ? With neat sketches, show how the joints are
related to folds and faults within an outcrop ?
Describe the geomorphic set-up of the Indian peninsular plateau and
add a brief note on the forces responsible for their formation.
DJSM-U-GELY 3
10
15
15
10
15
Q5. (৪)
(b)
(८)
(d)
(e)
Q6. (3)
(b)
(০)
౧7. (5)
(b)
(૦)
૦8. (a)
(0)
(૦)
SECTION B
Define lithostratigraphic units and give suitable example from India.
How are biological species different from paleontological species ?
Write the conditions suitable for the preservation of soft parts of fossils.
An unconfined aquifer has areal extent of 200 km? and specific yield of
20%. What is the average drawdown in the aquifer, if the pumped
volume of water from the area through uniformly distributed wells is
30 billion litres ?
What is porosity ? Briefly describe the generic classification of porosity.
Support your explanation with appropriate neat sketches.
Describe lithostratigraphic classification and depositional environments
of the Gondwana Supergroup. Comment on the economic importance of
the Gondwana Supergroup.
Critically discuss the factors which influence groundwater chemistry.
Explain the major chemical constituents of groundwater.
Describe the morphology of Ammonoidea with the help of neat and
labelled diagrams. Comment on their geological history and
stratigraphic importance.
Discuss in brief the evolutionary trends in Proboscidea.
Briefly discuss the stratigraphic classification of the Bastar Craton and
add a note on its economic importance.
What are the laboratory methods used for the determination of
hydraulic conductivity ? Explain each method in detail with the help of
neat and well-labelled sketches.
Discuss the importance of geological investigations in planning and
construction of tunnels. Add a note on potential consequences if
adequate geological assessment is not carried out.
Draw a neat and labelled diagram of dorsal view of trilobite and explain
the morphology.
Discuss the origin of the Deccan Trap Volcanism and comment on its
aftermath on climatic conditions and mass extinction.
DJSM-U-GELY 4
15
10
15
15
10
15
15
10
15
