Earth Science IOCL Paper Geology Quiz
Economic Geology Sample Paper
Q.1: Presence of framboidal and colloidal type of’ pyrite in a ore deposit indicate:
(a) High temperature of formation.
(b) Low temperature of formation due to biogenic process.
(c) Low temperature of formation due to hydrothermal process.
(d) None of these.
ANSWER.(b)
Q.2: Mark the correct statement:
(a) Mechanical disintegration does not create new minerals.
(b) Chemical weathering actually creates new minerals.
(c) Both mechanical disintegration and chemical weathering create new minerals.
(d) Both (a) and (b) are correct.
ANSWER.(d)
Q.3: Match the following:
I Il
1. Blanket bauxite deposits. i. Lying on erosional uncon formatives.
2. interstratified bauxite deposits. ii. With sediments derived from crystalline rocks.
3. Pocket bauxite deposits. iii. At or near the surface and approximately horizontal.
4. Transported bauxite deposits. iv. Occupying erosional depressions in limestone or dolomite.
(a)1-ii, 2-i, 3-iv, 4-iii.
(b)1-iii, 2-ii, 3-ii, 4-iv.
(c) 1-iii, 2-i, 3-iv, 4-ii.
(d)1-i, 2-ii, 3-iii, 4-iv.
ANSWER. (c)
Q.4: Placer deposits along hill slopes, caused by gravity are known as :
(a) Alluvial placers.
(b) Elian placers.
(C) Eluvia placers.
(d) Lacustrine placers.
ANSWER. (c)
Q.5: The most favorite sites for accumulation of placer are:
(a) Lower sluggish reaches of streams
(b) Upper headwaters.
(c) Middle reaches of streams.
(d) All the above.
ANSWER. (c)
Q.6: The lower unaffected part of the oxidation and supergene enrichment deposits is
Called:
(a) Zone of oxidation.
(b) Zone of supergene sulphide enrichment.
(c) Hypo gene.
(d) Muskogee zone.
ANSWER.(c)
Q.7: Which one characterizes all oxidized zones?
(a) Late rite.
(b) Pyrite.
(c) Chalcoclte.
(d) Limonite.
ANSWER.(d)
Q8: The oxidized outcropping cellular mass of limonite and gangue overlying
Aggregated sulphide deposits are commonly known as:
(a) Gondite.
(b) Gossans.
(c) Gash veins.
(d) Bugs.
ANSWER.(b)
Q.9: The bottom of the enrichment zone is:
(a) Highly irregular.
(b) Smooth.
(c) Gently curved.
(d) Plain.
ANSWER.(a)
Q.10 : Under increasing pressure condition, olivine and anorthite forms :
(a) Garnet and quartz.
(b) Sphene and Hornblende.
(c) Kyanite.
(d) Garnet.
ANSWER.(d)
Q.11 : Exploration by boring provides information of a deposit in terms of its :
(a) Nature of deposit.
(b) Thickness and inclination.
(c) Existence and extent of depth.
(d) Existence, extent, depth, thickness, inclination and nature etc.
ANSWER.(d)
Q.12 : Oil prospecting is achieved by :
(a) Very deep level drilling by modern drilling techniques.
(b) In shallow drilling by usual methods.
(c) Drilling by rotary methods alone.
(d) None of above.
ANSWER.(a)
Q.13: The choice of techniques to locate a certain mineral depends upon:
(a) Nature of the mineral.
(b) Nature of the mineral and of the surrounding rocks.
(c) Depth of the mineral deposits.
(d) Size and depth of the mineral deposits.
ANSWER.(b)
Q.14: Gravity prospecting is based on:
(a) Davey’s law.
(b) Gilbert’s law.
(c) Newton’s law.
(d) None of these.
ANSWER. (c)
Q.15: Which factor is the only one of significance in gravity explorations?
(a) Latitude.
(b) Elevation.
(c) Variation in density in the subs dace.
(d) Earth tides.
ANSWER. (c)
Q.16: Which correction in gravity prospecting, allows for surface irregularities in vicinity of:
the station :
(a) Boggier correction.
(b) Latitude correction.
(c) Free- air correction.
(d) Terrain correction.
ANSWER. (d)
Q.17: The unit of gravity is the:
(a) Gamma.
(b) Gal.
(c) Dyne.
(d) ohm-m.
ANSWER. (b)
Q.18: The magnetic method is particularly useful in exploration for asbestos, because of
(a) Its high magnetic susceptibility.
(b) Its occurrence in Ultrabasic intrusive rocks rich in magnetites.
(c) Its low magnetic susceptibility.
(d) Its occurrence near iron deposits.
ANSWER.(b)
Q.19: ln seismic refraction method, the fan shooting is particularly successful in locating
(a) Copper deposits.
(b) Coal deposits.
(c) Salt domes.
(d) Groundwater bodies.
ANSWER.(c)
Q.20: The loose material transmits seismic waves:
(a) More slowly than consolidated bed rocks.
(b) More fastly than consolidated bed rocks.
(c) Same as the consolidated bed rocks.
(d) None of these.
ANSWER.(a)
Q.21: The electro-chemical activity is controlled by:
(a) The composition of pore ground water.
(b) Concentration of electrolytes in the pore ground water.
(c) Mineralogical composition of the rocks.
(d) All the above.
ANSWER.(d)
Q.22: Which property is utilized in the inductive sub-method of electrical method for?
Geophysical exploration:
(a) Resistivity.
(b) Electro-chemical activity.
(c) Dielectric constant.
(d) None of these.
ANSWER.(c)
Q.23: Telluric current are result of the:
(a) Earth resistivity.
(b) Earth conductivity.
(c) Earth potentials.
(d) None of these.
ANSWER.(c)
Q.24 In potential drop ratio method, the instrument used for comparison of potential is
Called:
(a) Tetrameter.
(b) Fathometer.
(c) Current meter.
(d) Resistivity meter.
ANSWER.(b)
Q.25: ln electrical resistivity sounding curve, the rise in apparent resistivity indicates:
(a) A deep zone of high resistivity.
(b) A shallow zone of high resistivity.
(c) Variation in resistivity value.
(d) None of these.
ANSWER.(b)
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