List of top Questions asked in GATE Geology and Geophysics

The ratio of the largest to the smallest amplitude of waveforms that can be accurately recorded by a digital seismometer is reported as \(10^7\). Then, the dynamic range of the seismometer in dB is _______ (in integer).

A petroleum company estimates that a reservoir holds oil with a prior probability of 60\%. It then acquires petrophysical data that suggests the presence of oil. If the petrophysical analysis is accurate with a probability of 70\%, the posterior probability of the presence of oil in \% is ________ (rounded off to two decimal places).

Assume the acceleration due to gravity is $10 \, \text{m/s^2$. The geoid height anomaly in metres due to the gravitational potential anomaly of $-59 \, \text{m}^2/\text{s}^2$ measured over the spheroid is}

A spherical ore body produces a maximum gravity anomaly of 18 mGal when its centre is at a depth of 2 km from the surface. Assuming that the density contrast and the radius of the body remain unchanged, the ore body will produce a maximum gravity anomaly of 2 mGal if the depth to its centre in km is _______ (in integer).

The dimension of permeability is

In radiometric surveys, potassium in subsurface rocks will show a $\gamma$-ray peak in which one of the following MeV energy channels?

Which one of the following geophysical methods is suitable for the identification of seepage of water from dams?

The given beach-ball figure denotes the focal mechanism corresponding to which one of the following faults? \includegraphics[width=0.5\linewidth]{16.png}

At present, which one of the following planets does NOT have a magnetic field of internal origin produced by an active dynamo?

The Z-transform of the sequence \{1, 0, 1, 0, 1\ is:}

The given figure shows the self-potential anomaly observed over a two-dimensional thin sheet-type ore body whose strike is perpendicular to the plane of the paper. Which one of the following directions of polarization of the ore body leads to the given anomaly? \includegraphics[width=0.5\linewidth]{11.png}

A confined aquifer with a uniform saturated thickness of 10 m has hydraulic conductivity of \(10^{-2}\) cm/s. Considering a steady flow, the transmissivity of the aquifer in m\(^2\)/day is ______ (rounded off to one decimal place).

A current of 2 A passes through a cylindrical rod with uniform cross-sectional area of 4 m$^2$ and resistivity of 100 $\Omega$-m. The magnitude of the electric field (E) measured along the length of the rod in V/m is _________ (in integer).

Assume heat producing elements are uniformly distributed within a 16 km thick layer in the crust in a heat flow province. Given that the surface heat flow and reduced heat flow are 54 mW/m$^2$ and 22 mW/m$^2$, respectively, the radiogenic heat production in the given crustal layer in $\mu$W/m$^3$ is ________ (in integer).

The given figure shows the ray path of a P–wave propagating through the Earth. Choose the CORRECT P–phase corresponding to the ray path. \includegraphics[width=0.5\linewidth]{6.png}

Match the geophysical methods in Group–I with their associated physical properties in Group–II. \begin{tabular}{ll} Group–I & Group–II
P. Magnetic & 1. Chargeability
Q. Gravity & 2. Electrical conductivity
R. Magnetotelluric & 3. Susceptibility
S. Induced Polarization & 4. Density
\end{tabular}