List of top Geology Questions

The orientations of two planar limbs of an overturned anticline are 045°/72°SE and 225°/37°SE. The interlimb angle of the fold in degrees is ........... (In integer)
The cation exchange equilibrium reaction between end-member components of orthopyroxene and ilmenite is given below: \[ \text{MgSiO}_3 + \text{FeTiO}_3 = \text{FeSiO}_3 + \text{MgTiO}_3 \] (Enstatite) (Fe-Ilmenite) (Ferrosilite) (Mg-Ilmenite)
Considering ideal mixing of Fe and Mg in orthopyroxene and ilmenite solid solutions, the mole fractions are \( X_{\text{Orthopyroxene}}^{\text{Mg}} = 0.60 \) and \( X_{\text{Ilmenite}}^{\text{Mg}} = 0.40 \). The equilibrium constant of the above reaction is ............. (Round off to two decimal places)
A Rb–Sr isochron plot of cogenetic volcanic rocks yielded a slope of 0.003. The eruption age of these rocks is ............... Ma. (Round off to one decimal place)
The apparent dip amount of a limestone bed in the direction 010° is 30°. If the bed strikes 320°, the value of true dip amount in degrees is ............. (Round off to nearest integer)
For a \(2/m\) pyroxene, the extinction angle between the vibration direction and crystallographic axis, X ⊥ c, is 36°. Then the angle Y ⊥ b in degrees will be ............. (In integer)
The Throw of a fault is 4 m and the Heave is 3 m. The Dip separation of the fault, in meters, is ............... (In integer)
Consider the present volume of the Earth’s continental crust as \(7.5 \times 10^{18}\) m³. If continental crust formation started 3.0 Ga ago, then the average rate of continental crustal growth is ............. km³ yr⁻¹. (Round off to one decimal place)
A kimberlite pipe has a bulk density of 2.5 g/cc and contains diamond of grade 100 carat/metric ton. If the pipe contains only 1-carat diamond crystals, then the number of diamond crystals per cubic meter in the pipe is .................. (In integer)
Which of the following landforms is/are weathering dominated?
The mineral formula of orthopyroxene calculated on 6 Oxygen atom basis is (Mg1.2Fe0.8)Si2O6. The weight percentage of MgO in the chemical composition of orthopyroxene is ............. (Round off to one decimal place)
A grain has a size of 36 mm when observed under a magnification of 125 times. The actual size of the grain in µm is ............. (In integer)
Which of the following statement(s) related to ore-forming processes is/are CORRECT?
A metapelite is composed of muscovite + quartz + K-feldspar + kyanite mineral assemblage. If the muscovite and K-feldspar show solid solution between 'Na' and 'K' end-members, the minimum number of components that defines this metapelitic assemblage is ............. (In integer)
Radiogenic atoms of \(^{40}K\) have a half-life of \(1.25 \times 10^9\) years. The percentage of \(^{40}K\) atoms left after six half-lives will be .............. (Round off to two decimal places)
Moon is considered to have been formed due to high temperature condensation of post-collisional ejected material. Which of the following statement(s) related to its mantle composition as compared to CI carbonaceous chondrite is/are CORRECT?
Which of the following characteristics of fossils is/are necessary for biostratigraphic applications?
Which of the following statements related to stratigraphy is/are CORRECT?
Which of following combinations of sedimentary environments and their features is/are CORRECTLY matched?
Which of the following property/properties of a mineral indicate(s) uniaxial negative optic sign?
Which of the following is/are characteristic feature(s) of Brachiopods?
Which one of the following lithospheric plates has the least length of convergent boundary?
Which one of the following is a Paleozoic flora?
Which one of the following elements in the Earth is a chalcophile and shows siderophilic behavior?
Which one of the following set of landforms results dominantly due to erosion?
Which one of the following represents the CORRECT combination of stratigraphic unit with its corresponding age?