Geologist Junior • 2020 • Geology Paper-III
P-THEM Time Domain EM system, high sensitivity cesium magnetometer, GT-1A Gravimeter, hyper radio- spectrometer and multi-channel gramma ray spectrometer are the composition of:
A)
GSI’s Twin Otter Airborne Survey System
B)
GSI’s Heliborne Geophysical Survey System
C)
GSI’s Samudra Ratnakar
D)
GSI’s Samudra Manthan
A survey system establishes the spatial arrangement/reference framework of the measurements, including station coordinates and acquisition geometry.
Geologist Junior • 2020 • Geology Paper-III
Bryophyte moss has been a good indicator of which mineralization in Himachal Pradesh, India?
A)
Lead- zinc- silver
B)
Nickel
C)
Uranium
D)
Zinc
Bryophyte/moss has been used as a biogeochemical indicator of uranium mineralization in Himachal Pradesh.
Geologist Junior • 2020 • Geology Paper-III
How to drill a hole the epigenetic mineralization, which is associated with normal fault, to predict the likely attitude of high grade ore shoots within or adjacent to it after initial discovery of ore?
A)
By drilling a hole to along strike from the discovery hole to intersect the target at the same depth.
B)
By drilling a hole to the same depth as the discovery hole and along strike from it.
C)
By drilling a deeper hole on the same cross-section.
D)
By drilling a hole along the dip direction from the discovery hole.
Drilling along the dip direction from the discovery hole helps intersect the same structure at different positions and can constrain the attitude of high-grade shoots.
Geologist Junior • 2020 • Geology Paper-III
Which of the following material is lowest metal factor?
A)
Clay
B)
Gravel
C)
Limestone
D)
Sandstone
Gravel generally has relatively low polarizability/conductive response, giving a low metal factor compared with materials such as clay.
Geologist Junior • 2020 • Geology Paper-III
Which of the following statement is false about resistivity method?
A)
The small inter- electrode distances provide a very detailed image of near- surface inhomogeneities.
B)
An apparent resistivity map for a given electrode spacing indicates the general lateral variation in electrical properties in the area.
C)
If the data of Wenner sounding, the measured resistivity is plotted on the x-axis and the electrode separation on the y- axis.
D)
The data of Schlumberger sounding are plotted with electrode separation along the x-axis. This data should be drawn on a double logarithmic paper.
The statement that resistivity surveys do not require electrode contact is false; electrode-based resistivity methods generally require electrical contact with the ground.
Geologist Junior • 2020 • Geology Paper-III
In USGS/ USBM reserve classification scheme, a resources which are undiscovered theoretical mineral bodies in nature that may logically be expected to exist in known mining district or region under favorable geological conditions is:
A)
Hypothetical
B)
Paramarginal
C)
Speculative
D)
Submarginal
Hypothetical resources are undiscovered bodies reasonably expected to exist within known mining districts or regions under favourable geological conditions.
Geologist Junior • 2020 • Geology Paper-III
Which of the following statement is false about UNFC classification?
A)
UNFC is a three digit code based system- Economic viability axis, feasibility axis and geologic axis.
B)
Geological axis represented by four codes- Detailed exploration, general exploration, prospecting and reconnaissance.
C)
Feasibility axis have three codes- Feasibility study, Pre- feasibility study and geochemical study.
D)
Economic axis have three codes- Economic, potentially economic and intrinsically economic.
The feasibility axis is not defined by “geochemical study”; its codes relate to feasibility and pre-feasibility, making this statement false.
Geologist Junior • 2020 • Geology Paper-III
The fundament formula for civil engineering projects, a shear strength (s) given by Mohr- Colomb is:
A)
s = c ± stanw
B)
s = c + stanw
C)
s = s + ctanw
D)
s = cs + tanw
Mohr–Coulomb shear strength is s = c + σ tanφ; option B is the intended expression despite typographical defects in the symbols.
Geologist Junior • 2020 • Geology Paper-III
Two minerals fluorapatite and hydroxyapatite is related with which of the following fertilizer?
A)
Compound fertilizer
B)
Nitrogen fertilizer
C)
Phosphate fertilizer
D)
Potassium fertilizer
Fluorapatite and hydroxyapatite are phosphate minerals and are therefore related to phosphate fertilizers.
Geologist Junior • 2020 • Geology Paper-III
The coefficient of curvature (Cc) after particle size distribution curve is given by the formula of:
A)
Cc = D60 / D10
B)
Cc = (D30)^2 / (D10 * D60)
C)
Cc = (D10)^2 / (D30 * D60)
D)
Cc = D60 * D10 / D30
The coefficient of curvature is Cc = (D30)^2/(D10×D60).
Geologist Junior • 2020 • Geology Paper-III
Which of the following block is not related with ONGC Coal-bed methane (CBM) gas blocks?
A)
Bokaro
B)
Cambay
C)
Jharia
D)
Karanpura
ONGC's CBM blocks include Jharia, Bokaro, North Karanpura and Raniganj. Cambay is an oil/gas basin rather than the listed ONGC CBM block, so B is correct.
Geologist Junior • 2020 • Geology Paper-III
An ideal temperature range for transformation of kerogen to hydrocarbon at a depth of 3-4km with a normal geothermal gradient is:
A)
80- 90oC
B)
80- 150oC
C)
100- 150oC
D)
150- 180oC
Kerogen commonly generates petroleum within the oil window of roughly 80–150°C under a normal geothermal gradient.
Geologist Junior • 2020 • Geology Paper-III
A type of maceral having very fine- grained material, fine particles of small size (2 microns and high reflectance is:
A)
Fusinite
B)
Funginite
C)
Micrinite
D)
Secretinite
Micrinite consists of very fine-grained maceral material with small particle size and relatively high reflectance.
Geologist Junior • 2020 • Geology Paper-III
Fluid inclusions which are trapped during formation of the host minerals are:
A)
Primary fluid inclusions
B)
Secondary fluid inclusions
C)
Pseudosecondary fluid inclusions
D)
Tertiary fluid inclusions
The primary fluid in most magmatic-hydrothermal ore-forming systems is aqueous fluid, commonly derived from magmatic fluids and later mixed with meteoric water.
Geologist Junior • 2020 • Geology Paper-III
Which of the following sampler is used for getting undisturbed soil samples from soft and sensitive clays?
A)
Denison sampler
B)
Hand- carved samples
C)
Piston sampler
D)
Shelby tubes and thin- walled sampler
Thin-walled Shelby tubes and piston-type samplers are used to obtain relatively undisturbed samples from soft, sensitive clays.
Geologist Junior • 2020 • Geology Paper-III
A natural gas discovered by ONGC at Meidum exploring site in 2011. Which of the following statement is correct regarding this achievement?
A)
Lower Bhuban Formation, 3318-3325m, maximum flame height 10ft.
B)
Middle Bhuban Formation, 3318-3325m, maximum flame height 8ft.
C)
Upper Bhuban Formation, 3318-3325m, maximum flame height 10ft.
D)
Ranighanj Formation, 3318-3325m, maximum flame height 10ft.
ONGC's Meidum discovery was in the Lower Bhuban Formation at about 3318–3325 m, with a maximum flame height of about 10 ft.
Geologist Junior • 2020 • Geology Paper-III
The permissible settlement is the maximum in the case of:
A)
Isolated footing on clay
B)
Isolated footing on sand
C)
Raft on clay
D)
Raft on sand
Rafts generally tolerate the largest total settlement among the listed foundation cases; the commonly quoted permissible total settlement is about 100 mm for raft foundations on clay.
Geologist Junior • 2020 • Geology Paper-III
According to IS: 1893- 2002, the value of the horizontal seismic coefficient for any structure with natural period of vibration in second (T) <= 0.1 cannot be less than Z/2 (Z= Zone factor of the seismic zone). The horizon seismic coefficient for seismic zone V is:
A)
0.8
B)
0.12
C)
0.18
D)
0.24
For Zone V, Z = 0.36, so the minimum horizontal seismic coefficient is Z/2 = 0.18.
Geologist Junior • 2020 • Geology Paper-III
Which of the following skarn tectonic setting is related with oceanic island arcs?
A)
Copper skarn deposit
B)
Iron skarn deposit
C)
Tungsten skarn deposit
D)
Tulc and graphite skarn deposit
Copper skarn deposits are commonly associated with calc-alkaline magmatic systems, including island-arc settings, where intrusions react with carbonate rocks.
Geologist Junior • 2020 • Geology Paper-III
Which of the following parameter is important for construction of residential building?
A)
Bearing capacity
B)
Cone penetration
C)
Factor of safety
D)
Point load
Bearing capacity is a fundamental geotechnical parameter for residential-building foundation design.
Geologist Junior • 2020 • Geology Paper-III
Portland cement made from the following properties with content (%) in ascending order of:
A)
CaO > SiO2 > Al2O3 > Fe2O3 > MgO > SO3
B)
CaO > SiO2 > Fe2O3 > Al2O3 > SO3 > MgO
C)
SiO2 > CaO > Al2O3 > Fe2O3 > MgO > SO3
D)
SiO2 > CaO > Al2O3 > Fe2O3 > SO3 > MgO
The standard relative abundance of major Portland-cement oxides is approximately CaO > SiO2 > Al2O3 > Fe2O3 > MgO > SO3, matching A even though the question says 'ascending'.
Geologist Junior • 2020 • Geology Paper-III
Which of the following reserve estimation method is suitable for flat and low-dipping disseminated deposits with variable thickness and grade?
A)
Isograde
B)
Polygona
C)
Square and Rectangle
D)
Triangular
The polygonal method is commonly suited to flat or gently dipping disseminated deposits where thickness and grade vary between sample locations.
Geologist Junior • 2020 • Geology Paper-III
The macroscopically recognizable bands in humic coals and are the result of plant growth having band thickness between 3mm and 10mm are:
A)
Lithotypes
B)
Microlithotypes
C)
Macerals
D)
Kerogen
Lithotypes are macroscopically recognizable bands in humic coal, commonly about 3–10 mm thick and reflecting variations in plant material.
Geologist Junior • 2020 • Geology Paper-III
Which of the following is not the characteristic of Mumbai offshore Basin?
A)
The age of Mumbai offshore basin ranges from late Cretaceous to Holocene with thick sedimentary fill ranging from 1100-5000m.
B)
Mumbai offshore is a peri-cratonic rift basin situated on western continental margin of India, Paleocene- Lower Eocene source rocks, seals are Middle to Upper Miocene shales.
C)
Mumbai offshore is an intra-cratonic, structural and stratigraphic traps, Paleocene- Eocene source rocks, cap rocks are Middle to Upper Miocene shales
D)
Structural trap, source rocks are clastic sediments of Paleocene- Eocene (Panna Formation), reservoir rocks are Sandstone, Limestone and Siltstone and cap rocks are Middle to Upper Miocene shales.
Mumbai offshore is a peri-cratonic rift basin, not an intra-cratonic basin; therefore C is the incorrect characteristic.
Geologist Junior • 2020 • Geology Paper-III
Which of the following is the characteristic of primary migration of petroleum?
A)
The flow of petroleum from source rock to reservoir rocks.
B)
Expulsion of petroleum from fine- grained source rock.
C)
Petroleum moves through a coarse carrier bed.
D)
Petroleum moves from one trap to another or to a seep.
Primary migration is the expulsion of generated petroleum from the fine-grained source rock into carrier/reservoir pathways.
