COMBINED COMPETITIVE EXAMINATION (MAIN)
GEOLOGY
Paper-II
Time 3 hours Full Marks: 200
Note: The figures in the right-hand margin indicate full marks for the questions.

Attempt five questions in all.


Question No. 1 is compulsory.


1. Answer any ten questions 4xlO=40

What do you mean by volcanic glass?


What is cotectic


What is in biaxial mineral?


What are the faces, edges and solid angles in a crystal?


What is biproduct material?


What is graded bedding?
Comment on the significance of reconnaissance survey.



What is migmatism?


What is penecontemporaneous deformation?


What is Nicol prism?


What is schistose structure?


63/DD5-2015jGEO-PII/Set-A 1 P.T.O.
11·
2. Answer any: eight . 5x8=40

1

What are crystals? Is'· there any other fdrm of mineral can occur?


Define the solid angle in crystals.


What is lattice?


Name the important twinning in crystal.


What is the difference between length-fast and length-slow minerals?


Distinguish between clastic and non-clastic rocks with examples.


"

What is gossan?


What are poikilitic and myrmekitic textures?


What is pseudomorphism in crystals?


Distinguish between optically positive and negative minerals.


3. any five questions 8x5=40

Mention the cold age and ice age in respect of geological time-scale..


• Mention the concept of setting associated with various depositional environments.


Describe the geometrical procedure of determination of axial ratio in crystals.


What is Barrovian zone in metamorphic rocks?


What is the angle between optic axis and cleavage?


What is the sulphide enrichment under secondary enrichment of ores?


Discuss the petrogenesis of leptinite.


63/DD5-2015/GEO-PII/Set-A 2
4. Answer any four questions lOx4=40

Write the elements of symmetry and example for normal class of all the crystal systems.


Give the CIPW norms classification of igneous rocks.


Briefly mention the processes of mineral beneficiation.


Describe with neat sketches the features developed during the sediment transformation by rivers.


Describe the various intrusive and extrusive forms ofigneous rocks.


5. Answer any two questions 20x2=40

What is phase rule? How is it controlling the understanding of magma crystallization?


Describe the sedimentary mineral deposits formed by the igneous and metamorphic processes.


Give a detailed account of the elements of symmetry forms developed in minerals crystallizing in the system or monoclinic system.


6. Answer any four questions lOx4=40

What are heavy' minerals in sedimentary rocks? Discuss the procedure of separation of heavy minerals and. comment on their significance.


Describe the metamorphic processes along. with the agents of metamorphism and types of metamorphism.


Give an account of petroleum reserved in India.


Discuss the metallic and non-metallic deposits in India.


Describe the subfacies associated with greenschist and amphibolites facies in respect to mineral assemblage and PT.


63/DD5-2015/GEO-PII/Set-A 3 [P.T.a.
7. Answer any two questions 20x2=40
Describe the occurrence and distribution of iron-ore deposit in India.
Discuss the essentials of prospecting and exploration techniques.
Describe the occurrence and distribution of coal in India. Also
comment on the occurrence and quality of coal found in North-East
India.

8.
Write an essay on origin of the various types of magma. 40

9.
Describe economic mineral deposit. Write in detail the classification of economic mineral deposit with the help of a neat sketch. 40


10. Write the diagenesis and lithification of sandstone. 40

63/DDS-201S/GEO-PII/Set-A 4 DDS-lO