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Name of the University : Indian Statistical Institute
Exam : ISI Admission Test – Entrance Examination
Document Type : Sample/Previous Year Question Paper
Name of the Subject : Geology
Year : 2016

Website : http://www.isical.ac.in/~admission/IsiAdmission2017/PreviousQuestion/Questions-Jrf-Geology.html
Download Sample/Previous Years’ Questions :
GEA 2016 :  https://www.pdfquestion.in/uploads/11379-GEA-2016.pdf
GEB 2016 : https://www.pdfquestion.in/uploads/11379-GEB-2016.pdf
GEA 2015 : https://www.pdfquestion.in/uploads/11379-GEA-2015.pdf
GEB 2015 : https://www.pdfquestion.in/uploads/11379-GEB-2015.pdf
GEA 2014 : https://www.pdfquestion.in/uploads/11379-GEA-2014.pdf
GEB 2014 : https://www.pdfquestion.in/uploads/11379-GEB-2014.pdf

JRF Geology Entrance Questions for ISI Admission Test 2017 :

Test Code : GEA
Session : Forenoon
Time : 2 hours
Instruction :
Part I : Ten questions All questions carry 4 marks
Part II – twenty questions
** Give your answers in the answer booklet only.

Related : JRF Library & Information Science Sample Question : www.pdfquestion.in/11376.html

** Write your Name, Registration Number, Test Centre, Test Code and the Number of this booklet in the appropriate places on the answer sheet.
** Staple/attach question booklet with the answer booklet.
** All rough work must be done on the question booklet and/or on the answer booklet.
** You are not allowed to use calculator.

1. Read the accompanying geological map carefully and answer the following :
Part-I :
a) Interpret the contact relation between rock units ‘A’ and ‘D’, with suitable explanation.
b) Indicate the geometry of the fold within rock unit ‘D’ mentioning approximate orientations of fold axis, axial plane, and magnitude of inter limb angle.

c) Give two reasons why rock unit ‘A’ is to be considered as folded. State the nature of the fold giving approximate orientations of fold axis, axial plane, and magnitude of inter limb angle.
d) What is the nature of displacement along fault XY and what is its dip?

e) Draw a sketch cross section along line AB to depict the geological structure and relationship of different rock units.
f) Arrange the rock units in order of relative geological age. Briefly give reasons for your answer. 3+5+7+4+2+4

Part-II :
(Five questions, eight marks each)
2. A metamorphic rock consists of muscovite-biotite-quartz- almandine.
a) To which Barrovian metamorphic zone the rock can be assigned to? Briefly explain your answer. Comment on the geothermal barometric conditions under which the rock was metamorphosed.

b) Comment on the nature of the parent rock and metamorphic mineral transformations which led to present mineral assemblage. 2+2+4

3. a) Explain briefly the concept of P-T-t path. Draw a neat sketch of a clockwise P-T-t path on P-T space labelling the metamorphic evolutionary history.
b) A garnet-biotite mineral pair is often used for geothermometry. Explain why the same mineral pair cannot be utilized for geobarometry. 3+3+2

4. a) Describe with a neat sketch the major differences between a cost of trough and a coset of planar cross-strata when they are observed in a vertical profile cut parallel to the paleo flow directions.
b) What is Abundance Biozone or Acme Zone? Explain why this type of biozone is not always suitable for time-stratigraphic correlation. 4+1+3

5. Draw a schematic vertical log of a typical sedimentary succession deposited in a wave dominated shallow marine, siliciclastic setting where rate of net deposition is greater than the rate of relative sea level rise. 8

Part – A :
1. If the profile a symmetric recumbent fold is given by 2=4 , where (0,0) point is the hinge point of the fold and x-axis follows the axial trace, then the profile of a symmetric upright synform with y-axis as axial trace has the form
A. y2 = -4ax
B. x2= 4ay
C. y2 = 2ax
D. x2 = -4ay

2. Calculate the concentration of an element (C) after 50% crystallization (i.e. F = 0.5) if it’s initial concentration in the melt (i.e. C0) was 200.0 ppm and distribution coefficient D = 2.0
A. 200.0
B. 150.0
C. 100.0
D. 250.0.

3. Radioactive minerals become less radioactive (in counts per second) with time according to the equation given below (a is the radioactivity after time t, a0 in the initial radioactivity, ? is a constant which depends upon the mineral, ln is natural logarithm with base e)
A. ln(a) = ln(a0) – t
B. ln(a) = ln(a0) + t
C. ln(a0) = ln(a) – t
D. ln(a0) = ln(a) + t.

4. For a simple vertically traveling wave, the travel time t from the surface to the reflector and back is called the Two-Way Time (TWT) and is given by the formula (d is the depth of the reflector and V is the wave velocity in the rock).
A. t = 2d/V
B. t = 1/V
C. t = d/2V
D. t = 1/d.

5. Dissolved nitrate concentration of 18.0 mg/L is being advected with flowing groundwater at a velocity of 0.331 m/day in an aquifer with a porosity of 0.225. Groundwater from aquifer discharges into a stream. If the aquifer is 1.80 m thick and 123.0 m wide where it discharges into the stream the mass flux of nitrate into the stream would be
A. 297 gm/day
B. 300 gm/day
C. 290 gm/day
D. 295gm/day.