List of top Questions asked in GATE Geology and Geophysics

The diagram given below shows phase relations between components P and Q at 1 bar pressure. If 'X' represents the initial liquid composition, which of the following statements is/are CORRECT during equilibrium crystallization?
phase relations between components P and Q at 1 bar pressure.
Which of the following statements is/are CORRECT for the M-plane of any fault?
Which of the following microfossils is/are foraminifera?
Which one of the following represents deviatoric stress in a 2D stress Mohr Circle?
In the fold profile section shown in the figure, 1 and 3 are the oldest and the youngest stratigraphic units, respectively. Which one of the following fold descriptions CORRECTLY matches the asymmetric fold shown in the given figure?
stratigraphic units
If 'X' represents the initial composition of a melt, which one of the trends indicated by arrows in the schematic diagram corresponds to the evolution of the residual melt composition during crystallization of diopside?
the schematic diagram
Match the following copper deposits in Group-I with their host rocks in Group-II.
Group-I  Group-II
PKhetri 1Chlorite-biotite schist and soda-granite
QMosabani 2Garnetiferous chlorite schist 
RMalanjkhand3Metachert 
SKalyadi 4Tonalite-granodiorite-granite
Which one of the following events represents the termination of the Wilson Cycle in Plate Tectonics?
The fraction of the incident electromagnetic energy reflected from a material is known as
Consider the solubility product of barite (BaSO4) at 25 °C and 1 bar to be 10-10. If the activities of \(Ba^{2+}\) and \(SO^{2-}_4\) ions are 0.5×10-5 and 10-X, respectively, then the absolute value of 'X' is ____(rounded off to one decimal place). 
The support pressure of 20 kPa is required to stabilize the loose blocks of the Excavation Disturbed Zone (EDZ) at the crown of a circular tunnel with horizontal axis. The EDZ is to be stabilized by inserting rock bolts vertically into the roof. If the working capacity of a bolt is 160 kN, the area of the roof supported by a single bolt in m2 is______ (in integer).
The areas of drainage basins A and B are 25 km2 and 50 km2, respectively. The total length of drainages of all orders in basin A is 20 km. If both the basins have the same drainage density, the total length of drainages of all orders in basin B in km is____ (in integer).
Match the stratigraphic units in Group-I with the sedimentary basins in Group-II.
 Group-I  Group-II
PRamgundam 1Chhattisgarh
QRaipur Formation2 Kaladgi
RBagalkot Group3Marwar 
SSonia Sandstone4Godavari 
Which one of the following openings is a type of decline in underground mines?
Which one of the following optic signs is CORRECT for a mineral with the given centered optic axis figure?
optic signs
Match the following invertebrates in Group-I with their morphological features in Group-II.
 Group-I  Group-II
PTrilobite 1Periproct
QBrachiopod2Hypostome
RBivalve3Deltidial plate
SEchinoid 4Lunule
During high-temperature metamorphism of pelites, which one of the following mineral reactions represents the second sillimanite isograd?
Which one of the following is the correct arrangement of volcanics from the oldest to the youngest?
Which of the following types of deposits is/are formed by fractional crystallization of magma?
Which of the following sedimentary basins is/are producing hydrocarbon commercially?
Which of the following bivalves is/are swimmers?
Which of the following structures is/are associated with duplexes in fold-thrust belts?
Which of the following statements is/are CORRECT?
Match the microstructures in Group-I with their characteristics in Group-II. Group-I Group-II
Group-I  Group-II
PCore-mantle 1Radiating fibrous aggregate of K-feldspar with or without quartz
QDecussate2Large strained mineral grains surrounded by fine-grained, recrystallized grains
RSpherulite3Inclusion trails in a porphyroblast curves into the matrix foliation by developing concave outward pattern 
SMillipede 4Randomly oriented mineral grains dominated by crystal faces, such as in sheet silicates 
Which one among the following is the least abundant sedimentary rock in the stratigraphic record?