M.Sc. (Applied Geology) (Semester (CBCS) Examination, 2017
GEOCHEMISTRY
Day Date: Thursday, 20-04-2017 Max. Marks: 70
Time: 10.30 AM to 01.00 PM
Instructions Answer any five questions.
All question carry equal marks.
Question No. 1 compulsory.
Answer any 2 question from questions 4.
Answer any 2 question from questions 7.
Q.1 Choose the correct answer: 14
Siderites consist essentially of a
Nickel-iron alloy Nickel-iron alloy and silicates
Silicates only Silicates and graphite's.
The upper layer in the crust is rich in:
Silicon and Iron Silicon and Aluminium
Iron and magnesium Silicon and magnesium
Who had introduced the lithophile (rock-loving), siderophile
(iron-loving), chalcophile (ore-loving) and atmophile (gas-loving)
terminology.
Goldschmidt (1923) Clarke (1924)
Ringwood (1975) Cameron (1937)
One percent of the oxygen of the present day attained during the
Precambrian times is
Lewis point Pasteur point
Du mount point None
According to the cosmic abundance which of the following element
is abundant
a)Iron Carbon Silicon hydrogen
The most important temperature controlling mechanism in
atmosphere for the greenhouse effect are caused by
GHG Carbon-di-oxide
Water vapor All the above
The upper mantle having
Granitic composition Basic composition
Ultrabasic composition Felsic composition
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Which of the following radioactive element has half life of 5730
years?
235Uranium Thorium 14C 16O
Hydrogen is converted to helium in the sun this nuclear reaction
produces
Solar radiation Potential energy
Kinetic energy Radiation energy
10) The Gibbs free energy id defined by the formula
G E TS PV G dE TdS K
G E TS None of the above
11) Which of the following is not a suitable pair.
K-Rb Al-Ga Ca-Sr Si-Pb
12) The average salinity of seawater is
35% 24% 12% 62%
13) The element may have differing neurons in the nucleus hence may
have different Atomic weight having differing chemical and physical
properties they are termed
Ions Isobars Isotopes Isochrons
14) The Eh Ph diagrams were first proposed by
Krumbien Garrel Sloss Garret
Pettijohn None of the above
Q.2 What do you understand by the cosmic abundance of elements? Add a
note on the origin of elements.
14
Q.3 Write a full note on average composition of igneous rock. 14
Q.4 Using Eh pH diagram explain why permanganates are not stable in
the geological environment.
14
Q.5 Write short notes on the following. 14
Composition of hydrosphere
Distribution of elements in the metamorphic rocks
Q.6 Write in brief: 14
Rb-Sr dating technique
Natural and artificial radioactivity
Q.5 Discuss in short of the following 14
Geochemical classification of elements
Z/r index