List of top Geology Questions asked in GATE Geology and Geophysics

The given figure depicts an array used in DC resistivity surveys, where the current electrodes are denoted by C1 and C2, and potential electrodes by P1 and P2. If all the electrodes are equally spaced, then the given array corresponds to which one of the following configurations?

Which one of the following logging tools is used to measure the diameter of a borehole?

The Earth's magnetic field originates from convection in which one of the following layers?

In the schematic cross-section of a hill, a planar discontinuity intersects a planar slope face. Using kinematic analysis, which of the following conditions favor(s) plane failure to occur?

Based on the given mineral proportions, which one of the following statements is CORRECT?

Rock X: $\text{Olivine : Orthopyroxene : Clinopyroxene :: 50 : 30 : 20}$

Rock Y: $\text{Plagioclase : Alkali feldspar : Quartz :: 25 : 45 : 30} $

Rock Z: $\text{Biotite : Plagioclase : Alkali feldspar : Quartz :: 20 : 25 : 35 : 20}$

In the given schematic diagram, cross beds are exposed on a vertical rock face. The feature XY (bold line) represents a/an:

The schematic diagram represents thin section of a carbonate rock. The type of cement formed by large calcite crystals is known as:

The given outcrop pattern on a flat topography represents:

Match the following basins in Group I with their corresponding formations in Group II. \[ \begin{array}{|c|c|} \textbf{Group I} & \textbf{Group II} \\ P. Cauvery & 1. Lohardih \\ Q. Damodar & 2. Tiratgarh \\ R. Chhattisgarh & 3. Raniganj \\ S. Indravati & 4. Kallamedu \\ \end{array} \]

The minimum anion-to-cation radius ratio at which a 3-fold coordination becomes possible is ............. [round off to 2 decimal places]

Which of the following textures suggest(s) post-kinematic growth of the mentioned mineral?

Which of the following options represent(s) simultaneous crystallization of two minerals in the given feature(s)?

At a certain depth in the crust, the maximum and minimum principal compressive stresses are 150 MPa and 75 MPa, respectively, which lead to normal faulting. If the average density of the crust is 2700 kg/m$^3$, the crustal depth of fracture initiation according to Anderson's theory of faulting is ................ km. (g = 10 m/s$^2$) [round off to one decimal place]

A sandstone follows Mohr-Coulomb failure criterion. If the uniaxial compressive strength and the angle of the internal friction of the sandstone are 7 MPa and $30^\circ$, respectively, the calculated cohesion of the rock is ................ MPa. [round off to 2 decimal places]

In a drainage basin, the number of the 1st, 2nd, 3rd, 4th and 5th order streams are 240, 40, 8, 2 and 1, respectively. The average of all calculated bifurcation ratios is ............... [round off to 2 decimal places]

In porphyry copper deposits, the order of alteration zones from the intrusive body outwards is:

The ratio of bridging to non-bridging oxygen atoms in the amphibole structure is:

Which is the CORRECT sequence of ore minerals in their increasing order of reflectance?