A sandstone bed dipping 30° has an outcrop width of 20 m in a flat terrain. What is the true thickness (in m) of the bed?
1.5
2.10
3.20
4.30
An analysis of augite yields 3 silicon atoms calculated on the basis of 12 oxygen atoms. If only Al replaces Si, calculate the number of tetrahedral-Al in the mineral.
1.1
2.2
3.3
4.4
Ca-montmorillonite is formed by the chemical weathering of
1.calcite
2.augite
3.orthoclase
4.forsterite
Bouguer correction is applied to correct for the gravity anomaly due to mass between station location and
1.mean sea level
2. local datum plane
3.base of upper crust
4. Mohorovicic discontinuity
Calculate the concentration (in ppm) of Ni in olivine that crystallizes from a basaltic magma containing 20 ppm Ni. The partition coefficient (solid/melt) of nickel is 5.
1.4
2.20
3.100
4.500
Calculate the degree(s) of freedom of the assemblage orthopyroxene + clinopyroxene + plagioclase + hornblende + quartz + fluid in the chemical system CaO“FeO“MgO“Al2O3“SiO2“H2O with pressure and temperature as physical variables.
1.0
2.1
3.2
4.3
During its orbital motion around the Sun, the Earth is nearest to the Sun on
1.March 21
2.July 4
3.September 23
4. January 3
Eparchean unconformity separates geological units of
1.early Archaean from late Archaean
2.Archaean from Proterozoic
3.Proterozoic from Palaeozoic
4.Archaean from Phanerozoic
If the rake of net slip of an inclined fault is 90°, the fault is
1.strike-slip fault
2.dip-slip fault
3.oblique-slip fault
4.transcurrent fault
In Mohs' scale of hardness, how many minerals are of silicate composition?
1.4
2.5
3.6
4.7
In which of the following localities does coal deposit occur?
1.Dariba
2.Kudremukh
3.Wardha
4.Rudrasagar
On a photo-scale of 1:40000, a square shaped open cast coal mine of 1 km2 area would have an area of (in cm2)
1. 2.50
2.4.00
3.6.25
4.12.00
Out of the following gases which one has the highest contribution towards the greenhouse effect on the Earth?
1.CO2
2. CO
3.CH4
4. H2O
Specific discharge of 1 cm per day is observed in a porous medium where hydraulic head difference is 0.5 m and flow length is 20 m. Calculate the hydraulic conductivity (in m/day).
1.0.4
2.0.8
3.1.2
4.1.6
The Jurassic stratigraphic succession of Kutch is characterized by which one of the following?
1.Cephalopods
2.Trilobites
3.Brachiopods
4.Graptolites
When did the supercontinent Pangaea begin to break up?
1.Cenozoic
2.Mesozoic
3.Palaeozoic
4.Proterozoic
Which of the following is NOT a variety of silica (SiO2)?
1.Jasper
2.Coesite
3.Stishovite
4.Flinkite
Which of the following is NOT a variety of silica (SiO2)?
1.Jasper
2.Coesite
3.Stishovite
4.Flinkite
Which one amongst the following rocks commonly has highest unconfined compressive strength?
1.Coarse-grained sandstone
2.Mica schist
3.Fossiliferous limestone
4.Massive basalt
Which one of the following can be best explored using electromagnetic method?
1.Oil-bearing strata
2.Coal-bearing strata
3.Disseminated sulphide deposit
4.Massive sulphide deposit
Which one of the following can be estimated from SP log against a saline-water saturated sandstone formation encountered in a well?
1.Resistivity of formation water
2.Degree of water saturation
3.Depth of invasion
4.Permeability
Which one of the following mineral constituents exhibits strong absorption in the UV-blue band of the EM spectrum due to charge transfer effect leading to colouration?
1.Fe-O
2.Si-O
3.Al-OH
4.Mg-OH
Which one of the following river systems forms the largest fluvio-deltaic system in the world?
1.Mississippi"“Ohio
2.Red"“Mekong
3.Ganga"“Brahmaputra
4.Yellow"“Ba Hoi
Which one of these is NOT a source of sufficient water supply but can transmit certain quantity of water on a regional scale due to leakage?
1.Aquifer
2.Aquitard
3.Aquiclude
4.Aquifuge
Which physical property of the medium governs the response of Ground Penetrating Radar (GPR)?
1.Electrical conductivity
2. Electromagnetic conductivity
3.Seismic wave velocity
4.Electrical permeability (dielectric permittivity)