List of top Geology Questions

The behavior of trace elements in magmatic systems follows:
Given $\Delta V_r$ and $\Delta S_r$ are the volume and entropy of reaction, respectively, the most suitable conditions for the reaction to be used as a geothermometer are
Which one of the following mineral pairs shows solid solubility through coupled substitution of elements?
Choose the CORRECT statement regarding crystallization of a single feldspar of composition Or$_{50}$Ab$_{50}$ in the Albite–Orthoclase system.
Which of the given folds is/are represented by the stereoplot? \begin{center} \includegraphics[width=0.5\textwidth]{04.jpeg} \end{center}
At a depth of about 400 km inside the Earth, which one of the following occurs?
Which one of the following Phanerozoic periods has the shortest duration of time?
Which of the following is a chronostratigraphic unit?
During contact metamorphism, with increasing temperature,
A granite block starts sliding on a slope (inclination of 30° with the horizontal) under the effect of gravity only, along the true direction of inclination of the slope and hits the ground in 4 seconds. Considering zero friction and zero cohesion during sliding, the vertical height of the point (with respect to the ground) from where the block was dislodged is _____m. (g = 10 m/s2) (In integer)
An ore body defined by a 300m x 300m area is shown in the figure in which the drill hole locations on equally spaced square grid are marked (numbers 1-16). The average thickness of the ore body at the 4 interior points is 10.8m, at the 4 corners is 11.0m and at the remaining 8 boundary locations is 10.5m, respectively. The corresponding average grades are 1.5, 1.9 and 1.8wt%, respectively. Calculate the average grade (in wt%) of the full ore body using the Included Area Method. (Round off to two decimal places).
An ore body defined by a 300m x 300m area is shown in the figure
A soil sample shows an average beta count of 6.8 counts per minute (cpm) per gram of organic carbon. The \( \text{C}^{14} \) count rate from organic carbon of present day vegetation is 15.26 cpm/g. The age of the sample is ________ years. \text{[round off to 1 decimal place] (Half-life of \( \text{C}^{14} \) = 5370 years)}
Match the Volcanogenic Massive Sulfide (VMS)-type deposits in Group-I with the dominant mineralized host rocks in Group-II.
The following diagram shows phase relations in a system consisting of components A and B at 1 bar pressure. If the initial composition of liquid is R, during cooling and crystallization of magma, which of the following statement(s) is/are CORRECT?
Identify the common metamorphic minerals labelled X and Y in the ACF diagram.
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.
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]}
If the shrinkage factor of a crude oil is 0.7, its formation volume factor is ________. \text{[round off to 1 decimal place]}
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]}
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 radioactive nucleus \( {}^{290}_{92}X \) decays to \( {}^{278}_{87}Y \). The number of \( \alpha \) and \( \beta \) particles emitted during this decay are
In the geological map of India, which one of the following geological units has the largest area?
The rock-type used to build the walls of the Red Fort in Delhi is