Master of Science I (Applied Geology) Examination: Oct Nov
2016 Semester I (New CBCS)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SE
32
Friday
18/11/2016
10.30 AM
to
01.00 PM
Geochemistry
C
HCT 1.2
Instructions: Answer any five questions.
All questions carry equal marks.
Q.1 is compulsory.
Attempt any two from Q.2, 3 4
Attempt any two from Q.5, 6 7
Total Marks:70
Q.1 Choose the correct answer. 14
The elements that have strong affinity with oxygen to form silicate and
have iconic bonds are
Lithophiles Atmosphile
Chalcophile All the above
Which of the following is true in case of pure water?
OH- OHc)
OH- None
Which of the following radioactive element has half life of 703.8 million
years?
235 Uranium Thorium
14C 16O
Rb-element is usually found dispersed in
Na-mineral K-mineral
Ca-mineral Al-mineral
Seawater pH is typically limited to a range between
2 and 3.8 7.5 and 8.4
9 and 11 12 and 14
What is the pH value of Limestone geochemical fence?
7.8 5.4
8.3 12.1
The relative concentration of "O" in crust in comparison with its
concentration in mantle is
Higher Lower
Same All the above
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is a characteristic rock of Upper mantle.
Basalt Gabbro
Pegmatite Peridotite
Which of the elements that have the shortest residence time in the ocean?
Na-K Si-Al
Mg-Cl None of the above
10) Chlorinity is determined by precipitation of halides with
HCI Silver Nitrate
Hydrochloric acid None
11) Which of the following layers of the earth can be described as Oxysphere?
Biosphere Asthenosphere
Lithosphere Atmosphere
12) The concentration of gold is expected to be higher in
Core Crust
Mantle All the above
13) The density of Fe-Meteorites are around
8 gm/cm3 9 gm/cm3
10 gm/cm3 12 gm/cm3
14) The cosmic abundance data of elements indicate that there is a pronounced
peak in graph
Ni Fe
U Au
Q.2 Discuss distribution of elements in lgneous rocks. 14
Q.3 Write a full note on physic-chemical factors in secondary environment. 14
Q.4 What are decay clocks? Give various material in dating decay clocks. 14
Q.5 Write short notes on the following 14
Polymorphism and Isomorphism
Difference between sea and river water composition
Q.6 Write in brief: 14
Primary differentiation of earth
Climate changes during geologic history of earth
Q.7 Discuss in short of the following 14
Composition of meteorites
Causes and products of chemical weathering