Geologist Junior • 2020 • Geology Paper-III
What is a temporary structure built to enclose an area for excavation of foundation?
A)
Braced cut
B)
Bulkhead
C)
Coffer dam
D)
Conduit
A cofferdam is a temporary enclosure used to keep water/soil out of an excavation so foundations can be constructed.
Geologist Junior • 2020 • Geology Paper-III
Which of the following geochemical parameter is not defined kimberlites?
A)
Ultramafic, MgO >12% and generally >15%
B)
Ultrapotassic, molar K2O/Al2O3 <3
C)
Near-primitive Ni (>400 ppm), Cr (>1000 ppm), Co (>150 ppm)
D)
High H2O and CO2
Kimberlites are ultramafic, volatile-rich and strongly potassic rocks; the stated K2O/Al2O3 relationship in option B is the incorrect one.
Geologist Junior • 2020 • Geology Paper-III
A type of drilling method to collect rock chippings and is little contamination is:
A)
Auger drilling
B)
Percussion drilling
C)
Rotary drilling
D)
Reverse circulation drilling
Reverse-circulation drilling returns rock chips to the surface through the inner tube, reducing contamination compared with conventional percussion arrangements.
Geologist Junior • 2020 • Geology Paper-III
Which type of boring is extensively used for subsurface investigations of highways, railways and air fields?
A)
Auger boring
B)
Core boring
C)
Percussion drilling
D)
Rotary drilling
Auger boring is widely used for routine subsurface investigations of roads, railways and airfields, particularly in relatively soft soils.
Geologist Junior • 2020 • Geology Paper-III
Molybdenum (Mo) is a pathfinder element for the deposit of:
A)
Barium- Silver deposits
B)
Platinum- Palladium in mafic- ultramafic rocks
C)
Sulfide deposits
D)
Wolframite- tin deposits
Molybdenum is a useful pathfinder associated particularly with tungsten-tin systems, including wolframite-tin deposits.
Geologist Junior • 2020 • Geology Paper-III
Match the following and choose the correct answer regarding India’s status in mineral production in the world: a) Coal i) 1st, b) Copper ii) 3rd, c) Manganese iii) 4th, d) Zinc iv) 5th, v) 10th
A)
a-ii; b- i; c- iv; d- iii
B)
a-iii; b- i; c- v; d- i
C)
a-ii; b- v; c- iv; d- iii
D)
a-i; b- iii; c- ii; d- v
The intended match places coal at 3rd, copper at 5th, manganese at 4th and zinc at 3rd in the source's ranking scheme; C is the available keyed combination.
Geologist Junior • 2020 • Geology Paper-III
Which of the statement is false in preparation of basic anomaly map?
A)
‘High pass’ and ‘Upward continuation’ filtering techniques are used to enhance local features.
B)
‘Low pass’ and ‘Upward continuation’ filtering techniques are used for enhancement due to regional features.
C)
‘Horizontal derivative’ and ‘Analytical Signal’ are used to sharpen the effects of contacts or edges of the anomalous features.
D)
‘Reduction to pole’ filter is applied to magnetic anomalies to precisely locate the anomalous features of magnetic character.
High-pass filtering and upward continuation do not both enhance local magnetic features: high-pass emphasizes local/high-frequency anomalies, whereas upward continuation smooths and emphasizes broader regional features.
Geologist Junior • 2020 • Geology Paper-III
Which of the following is known as ‘The mineral heart land of India’?
A)
Chota Nagpur plateau
B)
North- Western Belt
C)
Sukinda valley
D)
Southern Belt
The Chota Nagpur region is a major mineral-producing heartland of India, especially for coal, iron ore, mica and other metallic minerals.
Geologist Junior • 2020 • Geology Paper-III
Which of the following is not active geophysical method?
A)
Electrical resistivity
B)
Gravity
C)
Ground Penetrating Radar
D)
Seismic
Gravity is a passive geophysical method: it measures variations in the Earth's gravitational field rather than transmitting an active source.
Geologist Junior • 2020 • Geology Paper-III
Geometry of the array is the basic principle of:
A)
Electrical resistivity
B)
Gravity
C)
Magnetic
D)
Seismic
Electrical-resistivity surveys are widely used to image subsurface geometry of resistive/conductive bodies and interfaces and are strongly controlled by array geometry.
Geologist Junior • 2020 • Geology Paper-III
If North-East becomes West, South-East becomes North, and so on. What will West become?
A)
North-East
B)
North-West
C)
South-East
D)
South-West
The transformation shifts each compass direction three positions anticlockwise in the 8-direction cycle; West therefore becomes South-East.
Geologist Junior • 2020 • Geology Paper-III
Which geophysical survey is used to detect dense bodies of rocks within host formations of less dense wall rocks?
A)
Electrical Resistivity
B)
Gravity
C)
Magnetic
D)
Seismic
Gravity surveys detect anomalous dense bodies because denser material produces a positive gravitational anomaly relative to less-dense host rocks.
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.
