What is the Karst cycle?

The Karst cycle describes the sequence of dissolution and subsurface landform development in soluble rocks leading to karst landscapes.

How is ground resolution computed from camera data?

Ground resolution depends on sensor size, focal length, pixel size, and altitude; it is derived from geometry of imaging and focal length.

What topics are covered under oceanic topography in this paper?

Oceanic topography topics include trenches, mid-ocean ridges, abyssal plains, and their relevance to coral reef development.

What are magnitude scales used for earthquakes?

Magnitude scales include moment magnitude and other traditional scales; they quantify earthquake size and relate to intensity.

How can faults be recognized in the field?

By identifying offset rock units, fault surfaces, damage zones, and characteristic stress-ellipsoid indicators in outcrop.

Geology Paper I - IFS Main 2025 (DJSM-U-GELY)

Central Government Jobs Other Jobs 2025

Year 2025
Conducted By Union Public Service Commission
Maximum Marks 200
Duration Three Hours
Languages English

Exam Details

Detail	Information
Examination	Indian Forest Services (Main) Examination-2025
Year	2025
Conducting Body	Union Public Service Commission
Paper	Geology
Subject	Geology
Duration	Three Hours
Maximum Marks	200

This SEO JSON consolidates the Geology Paper I for the Indian Forest Services (Main) Examination 2025 (DJSM-U-GELY). It combines the exam header, full repair of Page 2 questions (Q1–Q3 with subparts), and page-1 instructions. Page 1 sets the format: eight questions in total, Q1 and Q5 compulsory, with three of the remaining six to be answered from Sections A and B. The repaired questions on Page 2 cover topics in structural geology (plunging and reclined folds, Karst cycle), photogrammetry and ground measurement (aerial camera parameters, ground resolution), mineral deformation, remote sensing for groundwater, oceanic topography, fault structures, and earthquake magnitude scales. The metadata, FAQ, tag clusters, and image SEO are prepared to optimize discoverability while remaining faithful to the OCR content.

Major Topics Covered

Geology
Orogeny
Epeirogeny
Karst cycle
Folds
Aerial photography
Photogrammetry
Ground resolution
Ground coverage
Remote sensing
Groundwater exploration
Mineral exploration
Oceanic topography
Coral reefs
Fault structures
Stress ellipsoids
Earthquakes
Magnitude scales
Seismology
Crustal deformation

Why This Paper is Important

Useful for Indian Forest Services (Main) Examinatio preparation
Helps understand the latest exam pattern
Useful for practice and self-assessment
Covers frequently asked General Studies topics
Helpful for analysing question trends

Related Resources

Instructions

There are EIGHT questions in all, out of which FIVE are to be attempted.
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.
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.

Questions (page 2)

Q1. Q1. (a) Illustrate Plunging and Reclined folds. 8

Q2. Q1.
(c) Explain the Karst cycle. 8

Q3. Q1. (d) 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 μm and dimensions 36 mm × 24 mm. Calculate the ground resolution and ground coverage area at the nadir. 8

Q4. Q1. (e) 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. 8

Q5. Q1. (f) Explain the remote sensing techniques which are useful in groundwater. 8

Q6. Q2. (a) Explain oceanic topographies with their characteristics. Add a critical note on which part of oceanic topography is most suitable for the development of coral reefs. 15

Q7. Q2. (b) Describe fault structures with the help of stress ellipsoids. How can one recognize the fault in the field? 10

Q8. Q2.
(c) 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? 15

Q9. Q3. (a) 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? 15

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Geology Paper I - IFS Main 2025 (DJSM-U-GELY) — page 1 instructions scan PDF download — Page 1

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Frequently asked questions

What examination is this data for?

Indian Forest Services (Main) Examination 2025.

How many questions are there and which are compulsory?

There are eight questions in total; questions 1 and 5 are compulsory.

How many questions must be attempted from Sections A and B?

Out of the remaining six questions, three must be attempted with at least one from Section A and one from Section B.

In which language must answers be written?

Answers must be written in English only.

What is the paper code for Geology Paper I?

DJSM-U-GELY.

What is Orogeny and Epeirogeny?

Orogeny refers to mountain-building processes, while epeirogeny refers to broad vertical movements of the crust without mountain building.

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