List of top Questions asked in GATE Geology and Geophysics

The total number of symmetry elements in the crystal class represented by the point group 4/m3 2/m is:

The amount of Fe in a sample of 25 g of pyrrhotite (FeS) is $\underline{\hspace{1cm}}$ g. (Atomic wt. of Fe = 55.85 and S = 32.06) [round off to 2 decimal places]

The rate of spreading about a symmetric spreading center at the middle of a 4000 km wide sea is 40 mm/year. The spreading began $\underline{\hspace{1cm}}$ million years before present. [in integer]

A vertical aerial photograph is obtained over flat terrain with a 30 cm focal-length camera lens from an altitude of 18288 m. If the width of a dolerite dyke on this vertical photograph is 2 mm, its actual width on the terrain is $\underline{\hspace{1cm}}$ m. [round off to 2 decimal places]

The decay constant of a radioactive isotope is \(1.21\times 10^{-4}\ \text{year}^{-1}\). The half-life of the isotope is $\underline{\hspace{3cm}}$ years. [round off to nearest integer]

All the faces of an octahedron can be collectively symbolized by:

Shallow-focus earthquakes with tensional focal mechanism are characteristic of:

90% of the bulk Earth is constituted of Fe, Si, O and:

Which of the following is/are slope stabilization method(s)?

In which one of the given mass extinction events, global cooling that resulted in glaciation and lowering of sea level, is considered as the major cause of extinction for more than 50% of marine fauna?

Processes of fossilization affecting an organism from its death to burial under sediments come under the study of:

The dip and dip direction of the lee side of a straight crested ripple on modern sediments are found to be 15$^\circ$ and N10$^\circ$W, respectively. Considering unidirectional water movement, the flow direction is towards:

Rhodochrosite in hand specimen is most likely to be confused with certain varieties of:

Which of the following is NOT an essential property of a mineral?

The number of lattice points in a face-centered cubic (FCC) unit cell is:

Wenner DC resistivity survey. The operator forgot to cancel self-potential (SP) between potential electrodes before injecting current. With equal current magnitude: measured \(\Delta V_1=+158\ \text{mV}\) for current \(C1\rightarrow C2\) and \(\Delta V_2=-214\ \text{mV}\) for reversed current \(C2\rightarrow C1\). Determine the SP (in mV, integer) that existed between potential electrodes before current injection.

For the given figure, considering Pratt's model of isostatic compensation at the crust–mantle boundary, the crustal density ($\rho_1$) that explains 1.5 km deep lake is $\underline{\hspace{1cm}}$ kg/m$^3$. (Consider density of water $\rho_w = 1000$ kg/m$^3$) [round off to 2 decimal places] \begin{center} \includegraphics[width=0.5\textwidth]{05.jpeg} \end{center}

Which one of the following mineral pairs shows solid solubility through coupled substitution of elements?

The behavior of trace elements in magmatic systems follows:

Choose the CORRECT statement regarding crystallization of a single feldspar of composition Or$_{50}$Ab$_{50}$ in the Albite–Orthoclase system.

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

The CORRECT sequence(s) of electromagnetic radiations in terms of increasing wavelength is/are:

Which of the given folds is/are represented by the stereoplot? \begin{center} \includegraphics[width=0.5\textwidth]{04.jpeg} \end{center}

The bulk density and water content of a soil are \(1800\ \text{kg m}^{-3}\) and \(18%\), respectively. Find the dry density of the soil. \([\,\text{round off to 2 decimal places}\,]\)

Two-layer Earth: \(\rho_1=2000\ \text{kg m}^{-3},\ V_1=1800\ \text{m s}^{-1}\) (upper), \(\rho_2=3000\ \text{kg m}^{-3},\ V_2=2100\ \text{m s}^{-1}\) (lower). Compute the normal-incidence P-wave reflection coefficient at the interface. \([\,\text{round off to 3 decimals}\,]\)