List of top Geology Questions

The mole fraction of forsterite in olivine with MgO = 29.17 weight %, FeO = 34.65 weight % and $SiO_2$ = 36.18 weight % is _______ . (Round off to two decimal places) (Use molecular weight, in g/mol, of MgO = 40.31, FeO = 71.85 and $SiO_2$ = 60.00)

The thickness of a dipping coal bed measured along a vertical drill hole is 15 m. If the dip of the coal bed is 30⁰, the orthogonal thickness of the coal bed is ___________ m. (Round off to the nearest integer)

The fraction of $^{24}𝑁𝑎_{11}$ atoms remaining after a decay interval of 5.0 hours will be ______ . (Round off to three decimal places) (Use $t_{1/2}$ = 15.0 hours)

The lithostatic pressure at a depth of 36.5 km in the continental crust having an average density of 2800 $kg/m^3$, is _____ GPa. (Round off to the nearest integer) (Use g = 9.8 $m/s^2$)

Clinopyroxene crystallizing from a basaltic magma has Sm concentration of 24 ppm. If the clinopyroxene-melt partition coefficient for Sm is 1.2, the concentration of Sm in the basaltic magma will be ______ ppm. (In integer)

The area of a triangular block of a massive orebody is $1500 m^2$. If the thickness of the orebody is 5 m, 6 m and 7 m at the three corners of the triangular block, and the ore density is $2.5 tons/m^3$, the estimated ore reserve of the block is ______ tons. (In integer)

The geothermal gradient in the continental crust is 0.02 ⁰C/m. If the surface temperature is 25 ⁰C, the temperature at a depth of 18 km from the surface is ________ ⁰C. (In integer)

An aquifer has a cross-sectional area of 10 $m^2$ and a hydraulic conductivity of 0.25 cm/s. The volume of water that will flow per second through the aquifer for a hydraulic gradient of 0.04 is _____ $cm^3$. (Round off to three decimal places)

The mean flow velocity of water in an open channel having an average depth of 0.2 m, and with Froude Number 4, is ________ m/s. (Round off to one decimal place) (Use $g = 9.8 ms^{-2}$)

Consider the univariant metamorphic reaction Albite = Jadeite + Quartz. The minimum number of chemical components required to describe the composition of all the phases is _________ . (In integer)

The atom percent of Fe in pyrrhotite of composition $Fe_{0.77}S$ is ________. (Round off to two decimal places)

In a mineral with formula $KAl_3Si_3O_{10}(F_{0.5}OH_x)$, the value of ‘x’ is ________ . (Round off to one decimal place)

The dips of the normal and overturned limbs of a horizontal-overturned antiform are 30⁰ and 70⁰, respectively. The interlimb angle of this fold is _______ degrees. (In integer)

The vertical separation of a displaced horizontal stratum along a dip-slip reverse fault is 10 m when measured on a section perpendicular to the fault-strike. If the dip of the fault is 30⁰, the net slip of the fault will be ______ m. (In integer)

The value of φ (phi) of a sediment grain having a diameter of 0.125 mm is ______ . (In integer)

Which ones of the following are formed by brittle deformation?

For the given Barrovian metamorphic sequence, which of the following statements are correct?

Which of the following processes are correctly matched with corresponding deformation structures?

Which ones of the following correspond to the Pyroxene group?

Mass-wasting processes are

High drainage density is representative of a terrain with

Which of the following combinations are correctly matched?

The correct stratigraphic successions arranged from the oldest to the youngest are

Which of the following fossil groups are from the Siwalik Group?

Which of the following statements on mantle partial melting are correct?