List of top Geology Questions asked in GATE GG

On a fault surface with strike 320° and dip 55° NE, respectively, four sets of slickenslides were measured by a geologist. Given that the fault surface was measured correctly, the plunge and plunge direction of the lineation on the fault surface is
The sand supply and the variability of wind direction result in different dune types. In the options below, choose the CORRECT pair of dune types marked I and II in the figure.
Identify the common metamorphic minerals labelled X and Y in the ACF diagram.
The strike and dip of the axial plane of a reclined fold is 022° and 28° SE, respectively. The plunge direction (in whole circle bearing) of the axis of the reclined fold is ________ degrees. \text{[in integer]}
A mineral of uniform composition is cut into a wedge shape. The birefringence of the wedge section is 0.012. The retardation at 40 µm thickness of the wedge is ________ nm. \text{[in integer]}
If the shrinkage factor of a crude oil is 0.7, its formation volume factor is ________. \text{[round off to 1 decimal place]}
A radioactive nucleus \( {}^{290}_{92}X \) decays to \( {}^{278}_{87}Y \). The number of \( \alpha \) and \( \beta \) particles emitted during this decay are
Which one of the following cross-stratifications provides the paleocurrent direction on the truncated bedding surface of an undeformed cross-stratified sedimentary strata?
Which of the natural hazard(s) listed below can be caused by Earthquakes?
A coarse-grained igneous rock consists of 55% olivine, 25% augite, and 20% enstatite. According to the IUGS classification, the rock is
The rock-type used to build the walls of the Red Fort in Delhi is
In the geological map of India, which one of the following geological units has the largest area?
How many independent elastic parameters are needed to describe a homogeneous isotropic material?
Which among the following Period(s) belong(s) to the Paleozoic Era?
Which one among the following coastal erosional landforms is caused by the action of sea waves?
A rock formed at time \( t_0 \) with number of \( ^{14}C \) atoms = \( 10^5 \). The number of \( ^{14}C \) atoms (in log10) after a time of \( 8 \times 10^3 \) years is \(\underline{\hspace{1cm}}\) (round off to 3 decimal places). (Use a decay constant of \( 1.25 \times 10^{-4} \, \text{yr}^{-1} \))

The grade of copper (in wt%) of an ore body determined at locations 1, 2 and 3 are indicated (in parentheses) below. The grade of copper at an unknown location x calculated using Inverse-Square Distance Weighting (IDW) is \(\underline{\hspace{1cm}}\) wt %. (round off to 2 decimal places) 

The sketch shows a triangular rock mass (ABC) resting on a joint plane (AC) inclined at 35° with the horizontal. A rockbolt having an inclination of 25° with the horizontal is used to stabilize the slope. If the bolt tension (T) is 110 kN, the absolute value of shear force along the joint plane induced by the bolt tension is \(\underline{\hspace{1cm}}\) kN. 

In a zone of active normal faulting, the maximum and minimum in situ principal stresses (compressive in nature) are 30 MPa (\( \sigma_1 \)) and 10 MPa (\( \sigma_3 \)), respectively. The fault plane striking N-S has a dip amount of 60° towards E. Considering Anderson theory of faulting and using the given information, the calculated normal stress on the fault plane is \(\underline{\hspace{1cm}}\) MPa. (in integer)

A circular tunnel is being excavated in a blocky rock mass by drilling and blasting. An excavation disturbed zone (EDZ) around the tunnel extends 0.70 m into the rock from the excavation surface. Considering the unit weight of the rock as 25 kN/m³, the support pressure required at the crown of the tunnel to stabilize the loose blocks of the EDZ is \(\underline{\hspace{1cm}}\) kPa. (round off to one decimal place)

The mole percentages of \(SiO_2\), \(Al_2O_3\), and \(K_2O\) in a granitic rock are 84.21, 7.89 and 7.89, respectively. The molar proportion (in %) of K-feldspar in the rock is \(\underline{\hspace{1cm}}\) . (round off to one decimal place)

A mantle source rock melts at a time to giving rise to melt (M) and residue (R). Which of the following statements is CORRECT about evolution of the \(( ^{143}Nd/^{144}Nd )\) and \(( ^{87}Sr/^{86}Sr )\) isotope ratio in M (that crystallized to form a rock) and R?

Match the rock types in Group-I with their most likely corresponding lithospheric / tectonic settings of formation in Group-II 
\[\begin{array}{|c|c|} \hline \textbf{Group I} & \textbf{Group II} \\ \hline \text{P. Boninite} & \text{1. Continental anorogenic} \\ \hline \text{Q. Lamproite} & \text{2. Island-arc} \\ \hline \text{R. Phonolite} & \text{3. Continental collision} \\ \hline \text{S. Leucogranite} & \text{4. Intraplate oceanic} \\ \hline \end{array}\]

The symmetry elements of a point group are: 3 crystallographic axes of 2-fold symmetry and 3 mirror planes perpendicular to the crystallographic axes. The Hermann – Mauguin notation of the point group is:

Match the items in Group-I with corresponding appropriate items in Group-II. 
Group-I                        Group-II
P. Cs                           1. Siderophile 
Q. Au                         2. Chalophile 
R. Cd                          3. Atmophile 
S. Rn                          4. Lithophile