Geology Practice IOCL Questions
Model Test Paper PETROLOGY
Q.1: Chalk is a variety of:
(a) Biosparite.
(b) Sparite.
(c) Biomicrite.
(d) Stromatolite.
ANSWER. (c)
Q.2: Guano deposits are formed by accumulation of:
(a) The excreta of fish-eating birds.
(b) The aragonite shells.
(c) The calcareous shells.
(d) The bones of sea- birds.
ANSWER. (a)
Q.3: Lagoonal deposits are deposited under:
(a) Euxinic environment
(b) Esturiane environment .
(c) Littoral environment.
(d) Lacustrine environment.
ANSWER. (a)
Q.4: The authigenic apatite in the sandstone-type uranium mineralisation, points towards:
(a) Diagnosis in littoral-marine environment.
(b) Diagenesis in euxenic conditions of marine affinity.
(c) Location of source rock.
(d) None of these.
ANSWER. (b)
Q.5: The upper cretaceous Mahadek formation at Domiasiat, Meghalaya is well known for:
(a) Calcareous type thorium mineralisation
(b) Calcareous type uranium mineralisation.
(c) Sandstone type uranium mineralization.
(d) Agarillaceous gold deposits.
ANSWER. (c)
Q.6: Deposition of sediments in presence of large volume of water is found in:
(a) Arkosic facies.
(b) Mollasse facies.
(c). Euninic facies.
(d) Flysch facies.
ANSWER. (c)
Q.7: When depositional environments migrate laterally, sediments of one environment
come to lie on top of sediments of an adjacent environment, is:
(a) EuIer’s Law. .
(b) WaIther’s Law.
(c) Jame’s Law.
(d) Franklin’s Law.
ANSWER. (b)
Q.8: Terragenous marine sediments are:
(a) Result of marine activity.
(b) Land derived sediments.
(c) Precipitated sediments.
(d) Both (a) and (b).
ANSWER. (b)
Q.9: Any thick succession of sandstone calcarenite of conglomerate alternatic with shale of
sandstone and deposited mainly by turbidity currents in a deep water environment within a
tectonically active orogenic belt is commonly named as:
(a) Crevice.
(b) Flysch.
(c) Xenolith.
(d) Tecto- sedimentary rock.
ANSWER. (b)
Q.10: The poor sorting of a sediment is generally the result of:
(a) Rapid deposition and more reworking.
(b) Rapid deposition and little reworking.
(c) Slow deposition and little reworking.
(d) Slow deposition and more reworking.
ANSWER. (b)
Q.11: The presence of a limestone indicate about the nature of the area in which it was
formed that:
(a) There were not much land-derived sand, silt and clay.
(b) The carbonate would have been over whelmed and could not form a bed of pure calcium carbonate.
(c) The limestone beds would have formed far from land.
(d) All the above are correct.
ANSWER. (d)
Q.12: Diagenesis process involves the alternation of:
(a) Structure only.
(b) Structure and texture only
(c) Structure, texture and mineralogy.
(d) None of these.
ANSWER. (c)
Q.13: The diagenesis of carbonates involves changes in:
(a) Particle size.
(b) Porosity.
(c) Authigenic mineral growth.
(d) All the above are correct.
ANSWER. (d)
Q.14: Cross-beds are very important sedimentary structures because they provide
information about:
(a) The environment of deposition.
(b) The palaeocurrents.
(c) Identification of top and bottom of a bed.
(d) All the above are correct.
ANSWER. (d)
Q.15: Heavy minerals are those minerals whose density is above:
(a) 2.2.
(b) 2.6.
(C) 2.9.
(d) 3.5.
ANSWER. (c)
Q.16: Study of heavy minerals is more important in the case of:
(a) Igneous plutonic rocks.
(b) Igneous volcanic rocks.
(c) Sedimentary rocks.
(d) Metamorphic rocks.
ANSWER. (c)
Q.17: Sediments deposited in deltas, may be kept under the category of:
(a) Terrestrial.
(b) Marine.
(C) Terrestrial-marine.
(d) None of these.
ANSWER. (c)
Q.18: What kind of igneous rock is a likely source for arkoses sandstone?
(a) Granite.
(b) Syenite.
(c) Gabbros.
(d) Diorite.
ANSWER. (a)
Q.19: Sandstone composed of 25% or more of the sand grains of' feldspar is called as:
(a) Quartz-sandstone.
(b) Arkoses-sandstone.
(c) Lithe- sandstone.
(d)Greywacke.
ANSWER. (b)
Q.20: Radiolarian and Diatomaceous Oozes are:
(a) Phosphate deposits.
(b) Siliceous deposits.
(c) Calcareous deposits.
(d) Carbonaceous deposits.
ANSWER. (b)
Q.21: Tipam sandstone is mainly:
(a) Lithiwacke.
(b) Quartzwacke.
(c) Feldspathicwacke.
(d) Lithicarenite with some quanzwacke.
ANSWER. (d)
Q.22: Quartz is the most abundant constituent of sand and sandstone, because:
(a) It is a fairly abundant primary mineral.
(b) It is devoid of any cleavage.
(c) It is highly resistant to decomposition.
(d) All the above are correct.
ANSWER. (d)
Q.23: Sandstones consisting of 60% quartz and 30-34% feldspars are called:
(a) Arkoses.
(b) Greywacke.
(c) Grit.
(d) Free stone
ANSWER. (a)
Q.24: What does a conglomerate indicate about the energy conditions
in the environment of deposition?
(a) Low energy.
(b) Medium energy.
(c) High energy.
(d) All the above.
ANSWER. (c)
Q.25: Which term is used for flexible sandstone:
(a) lgnimbrite.
(b) Itacolumite.
(c) Ferricrete.
(d) None of these.
ANSWER. (b)
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