Earth Science Test Geology ONGC Paper
Geology Practice Sample Paper
Q.1: Which type of metamorphism favours growth of dense minerals:
(a) Low - pressure metamorphism
(b) Moderate - pressure metamorphism
(c) High - pressure metamorphism
(d) All the above
Answer. (c)
Q.2: Grain growth and size in metamorphic rock are a function of:
(a) Nucleation kinetics
(b) Material transfer processes
(c) Growth rate and P-T of crystallisation
(d) All the above.
Answer. (d)
Q.3: Mark the correct statement regarding;"Fluid flow during metamorphism":
(a) ‘Ferry’s hypothesis (1980) the "infiltrating fluid mechanism", may account for the formation of
Metamorphic minerals under unfavourable P-T conditions.
(b) Valley's (1986) "Batch volatilisation" hypothesis states that the volatile products remain at reaction
site for sometimes before being released.
(c) Valley’s (1986) "Rayleigh volatilisation" hypothesis states that the volatile products leave the
reaction site as soon as they are released never to returns.
(d) All the above are correct.
Answer. (d)
Q.4: Granulite facies rocks are generally formed under:
(a) High pressure -temperature conditions with low activities.
(b) Low pressure - temperature conditions.
(c) High pressure -temperature conditions with high activities.
(d) Low pressure and high pressure condition.
Answer. (a)
Q.5: During metamorphism the mineral graphite:
(a) Is completely destroyed.
(b) Is changed into pure carbon.
(c) ls converted into diamond.
(d) Does not take part in chemical change.
Answer. (d)
Q.6: Which plagioclase is commonly found in the lowest grade of metamorphic rocks:
(a) Albite
(b) Andesine
(c) Bytownite
(d) Anorthite.
Answer. (a)
Q.7: The bulk chemical composition of a rock during metamorphism, may change through
the introduction and / or removal of material then this metamorphism is known as:
(a) lsochemical metamorphism
(b) Allochemical metamorphism
(c) Auto - metamorphism
(d) None of these.
Answer. (b)
Q.8: ln the high grades of metamorphism, which variety of garnet mineral is present:
(a) Almandite
(b) Uvarovite
(c) Grossularite
(d) Pyrope.
Answer. (d)
Q.9: Calcite is stable to higher metamorphic grades than dolomite because:
(a) Magnesium carbonate is much more readily decomposed than calcium carbonate.
(b) Magnesium carbonate is converted into during metamorphism.
(c) Magnesium carbonate is much less in quantity than calcium carbonate.
(d) None of these.
Answer. (a)
Q.10: Retrograde metamorphism is also known as:
(a) Diaphthoresis
(b) Additive metamorphism
(c) lnjective metamorphism
(d) None of these.
Answer. (a)
Q.11: The agents of metamorphism are:
(a) Pressure and temperature.
(b) Temperature and chemical fluids
(c) Pressure and chemical fluids
(d) Temperature, pressure and chemical fluids.
Answer. (d)
Q.12: What type of metamorphic rocks are expected to be present in narrow zones of
major faults and thrusts:
(a) Contact metamorphic rocks
(b) Dynamic metamorphic rocks
(c) Thermal metamorphic rocks
(d) None of these
Answer. (b)
Q.13: For a range of 0-1OK bar in the continental crust, the high temperature limit of
metamorphism lie in the range:
(3) 500 - 700° c
(0) 700 - 900° c
(C) 1000 - 1200° c
(0) 1100 - 1300° c
Answer. (b)
Q.14: Regional dynamo thermal metamorphism is evidenced by the:
(a) Foliated fabric of rocks
(b) Granular fabric of rocks
(c) Presence of fluid inclusions
(d) None of these
Answer. (a)
Q.15: Nematoblastic is term applied to fabric dominated by:
(a) Tabular minerals
(b) Flaky minerals
(c) Prismatic minerals
(d) None of these
Answer. (c)
Q.16: Psammitic rocks are those metamorphic rock which have been derived from:
(a) Gravel rocks
(b) Aranaceous rocks
(c) Argillaceous rocks
(d) Rudaceous rocks
Answer. (b)
Q.17: Biotite is normally abundant in hornfelses and commonly shows random arrangement.
Such a fabric is termed:
(a) Porphyroblastic
(b) Blastoporphyritic
(c) Decussate
(d) Lepidobiastic.
Answer. (c)
Q.18: The parentage of an orthoamphibolite is:
(a) Metamorphic
(b) Sedimentary
(c) lgneous
(d) Both sedimentary and lgneous
Answer. (c)
Q.19: The term Skarn refers to:
(a) Thermal metamorphic rock
(b) Contact metamorphic and commonly metasomatic
(c) Contact metamorphic and commonly metasomatic rock composed of lime silicate.
(d) None of these.
Answer. (c)
Q.20: Migmatites are rock which are characterised by:
(a) Granitic nature
(b) High grade regional metamorphism
(c) Low grade regional metamorphism
(d) Both a and b.
Answer. (d)
Q.21: Eclogites are composed of:
(a) Omphacite
(b) Omphacite and garnet
(c) Garnet and feldspars
(d) Tremolite and Garnet.
Answer. (b)
Q.22: Which mineral cannot be represented in the ACF diagram:
(a) Na-feldspar
(b) K-feldspar
(c) Calcite
(d) Diopside
Answer. (b)
Q.23: What minerals cannot be shown in A’FK diagram:
(a) Na-bearing minerals
(b) K - bearing minerals
(c) Ca-bearing minerals
(d) None of these
Answer. (c)
Q.24: Determination of zonal boundaries may enable one to identify:
(a) Isothermal surfaces
(b) lsobaric surfaces
(c) Isothermal and lsobaric surfaces
(d) Mineral composition of the rock.
Answer. (c)
Q. 25: The green schist facies includes the:
(a) Chlorite zone
(b) Chlorite and biotites zones.
(C) Biotite -end -garnet zones
(d) Garnet and Kyanite zones.
ANSWER. (b)
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