UPSC Indian Forest Service Main 2025 Geology Paper II PDF

Central Government Jobs Other Jobs 2025

  • Year 2025
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 200
  • Duration Three Hours
  • Languages English

Exam Details

Detail Information
Examination UPSC Indian Forest Service (Main) Examination
Year 2025
Conducting Body UPSC
Paper Geology Paper - II
Subject Geology
Duration Three Hours
Maximum Marks 200
Number of Questions 8
Question Type Mixed

This document contains the question paper for the UPSC Indian Forest Service (Main) Examination 2025, specifically Geology Paper II. It outlines the instructions for candidates, including the number of questions to attempt, compulsory questions, and marking scheme. The paper consists of a mix of objective and descriptive questions, covering various aspects of Geology relevant to the Indian Forest Service. Aspirants can use this paper to understand the exam pattern, difficulty level, and key topics tested in the IFS Main examination.

Major Topics Covered

  • Crystallography
  • Minerals
  • Igneous Rocks
  • Metamorphism
  • Sedimentary Structures
  • Pyroxene Group
  • Phase Diagrams
  • Sedimentary Facies
  • Anorthosites
  • Sandstone Classification
  • Physical Properties of Minerals
  • Optical Properties of Minerals

Why This Paper is Important

  • Useful for UPSC Indian Forest Service (Main) Examin 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

  • UPSC Indian Forest Service (Main) Examination 2024 Geology Paper II
  • UPSC Indian Forest Service (Main) Examination 2025 Geology Paper I
  • UPSC Indian Forest Service (Main) Examination 2025 General Studies Paper I
  • UPSC Indian Forest Service (Main) Examination 2025 Geology Paper II Answer Key
  • UPSC Indian Forest Service (Main) Examination Syllabus
  • Geology Syllabus for Competitive Exams
  • UPSC Indian Forest Service (Main) Examination Pattern
  • IFS Main Exam Structure

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)

Section A

Q1. Write down the symmetry elements required for different crystallographic systems. Corresponding to each system, give suitable examples of minerals.

(a) Write down the symmetry elements required for different crystallographic systems. Corresponding to each system, give suitable examples of minerals.

(b) For mafic igneous rocks, draw labelled sketches for corona structure and porphyritic texture. Comment briefly on their petrogenetic significance.

(c) What do you mean by birefringence and twinning in minerals? Give some common examples of twinning found in quartz.

(d) Write briefly on retrograde metamorphism.

(e) What are turbidites? Give the sequence of bed-forms produced by turbidity currents.

Section A

Q2. Give a systematic account of the pyroxene group of minerals highlighting their types, crystal structure, mineralogy, composition, physical and optical characters.

(a) Give a systematic account of the pyroxene group of minerals highlighting their types, crystal structure, mineralogy, composition, physical and optical characters.

(b) Draw a neat labelled sketch of the Diopside-Anorthite phase diagram (1 atm; dry). Trace the course of crystallization in this system for an initial liquid (P) having a composition Di_{80}An_{20}. For this system, deduce the degree of freedom (F) at the eutectic point. Comment on the petrogenetic significance of this system.

(c) Define a sedimentary facies model. Illustrate with neat sketches the sedimentary facies likely to develop in a meandering fluvial depositional environment.

Section A

Q3. Give a detailed petrogenetic account of anorthosites. Give any two well-known examples of anorthosite occurrences of India.

(a) Give a detailed petrogenetic account of anorthosites. Give any two well-known examples of anorthosite occurrences of India.

(b) Write short notes on the following :
(i) Poikilitic texture
(ii) Intergranular texture
(iii) Pleochroism

(c) Which factors control the composition and texture of sandstones? Give the classification of sandstone.

Section A

Q4. Write down the diagnostic physical properties of the following minerals : Sphalerite, Dolomite, Stibnite

(a) (i) Write down the diagnostic physical properties of the following minerals : Sphalerite, Dolomite, Stibnite

(b) (ii) Give the characteristic optical properties for the following minerals : Garnet, Hornblende

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UPSC Indian Forest Service Main 2025 Geology Paper II question paper page 1 instructions scan PDF download. Includes exam instructions and paper details.
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UPSC Indian Forest Service Main 2025 Geology Paper II question paper page 1 instructions scan PDF download. Includes exam instructions and paper details.

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Frequently asked questions

What is the exam name for this question paper?

The exam name is UPSC Indian Forest Service (Main) Examination.

What is the year of this question paper?

The year of this question paper is 2025.

Which paper is this from the IFS Main Examination?

This is Geology Paper - II.

Who conducts the Indian Forest Service Examination?

The Indian Forest Service Examination is conducted by UPSC (Union Public Service Commission).

What is the total number of questions in this paper?

There are EIGHT questions in total.

How many questions are to be attempted in this paper?

Out of the eight questions, FIVE are to be attempted.

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