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BJKE-B-GLY
INDIAN FOREST SERVICE (MAINJEXAM- 2023
GEOLOGY
Paper - II
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 5 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.
SECTION A
(a) What do you understand by crystal defects ? Briefly explain the types of .تو
structural defects found in crystals. 8
02) What are the types of compositional zoning ? Discuss the petrogenetic
significance of compositional zoning in feldspar minerals. 8
(c) Explain the phenomenon of varying relief observed in calcite mineral
under the plane polarised light with the help of neat well-labelled
diagram. 8
(ત) Elaborately explain the significance of Bowen’s reaction principle in
petrogenetic studies. 8
(e) How are diagenesis and lithification different in the process of formation
of sedimentary rocks ? 8
BJKE-B-GLY 1
Q2. (a)
(b)
০)
૦3. (8)
(b)
(০)
९4. (a)
(b)
(c)
BJKE-B-GLY
Describe the crystal structure, types, mineralogy, composition, physical
and optical properties of amphibole group of minerals. Add a note on the
uses of amphibole minerals.
What is magma diversification ? Explain in detail the mechanisms
involved in the diversification of magma with the help of neat
well-labelled diagrams, wherever required.
Discuss the sedimentary basins of India with a special reference to oil
and gas.
Describe in detail the classification of crystal systems based on the
crystallographic axes and symmetry elements. Give examples and neat
well-labelled diagrams, wherever required.
What are pyroclastic rocks ? Describe the textures exhibited by
pyroclastic rocks with the help of neat well-labelled diagrams.
What are sedimentary structures ? Explain the significance of these
structures.
Explain in detail the physical properties of minerals depending upon :
(i) Interaction with light.
(1) 8६8६6 of aggregation.
Discuss the processes involved in the principal types of metamorphism.
Add a note on the resulting rocks in each type.
Discuss the sedimentary facies and their significance.
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Q5. (৪)
(b)
(c)
(d)
(e)
Q6. (৪)
(b)
(c)
07. (৪)
(b)
(c)
९8. (৯)
(b)
(c)
BJKE-B-GLY
SECTION B
What is metasomatic replacement ? How does it help in the formation of
mineral deposits ?
Explain metallogenic provinces and epochs citing examples from India.
What is the significance of mineral beneficiation ? Explain the
beneficiation technique used for sulphide ores.
Explain Isomorphism and Polymorphism with suitable examples.
What are the environmental impacts of urbanisation ?
Discuss the mineralogy, mode of occurrence and distribution of uranium
deposits of India.
Name the various geophysical methods of prospecting. Explain the
methods used in prospecting of oil and gas.
Discuss the causes and effects of Earthquakes. Add a note on its
mitigation measures.
Discuss various controls of ore localization by giving suitable examples.
Discuss various conventional methods of estimation of reserves of ore
bodies.
Give an account of compositional diversity across Earth’s different layers
with a neat sketch.
Discuss various methods used for mining deep-seated ore bodies.
(i) Give a brief account of India’s mineral policy.
(ઊં) What are critical minerals ? Name fifteen critical minerals of India.
Discuss the point and non-point sources of groundwater pollution.
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