List of top Geophysics Questions

The shape of air film formed between the plano-convex lens and the glass slab in Newton’s ring experiment is

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).

There are indications of presence of a massive tabular multimetal sulfide ore body at a shallow depth from the surface. Which of the following would be the most efficient geophysical method to confirm the presence of the ore body?

The potential difference measured between potential electrodes using Wenner array is 500 mV when a current of 2 A is passed through the subsurface between current electrodes. If the computed apparent resistivity is 100 Ωm then the distance between the current electrodes will be \(\underline{\hspace{1cm}}\) meters.

In a 2D seismic survey, first receiver location is at (1000 m, 4000 m), second receiver location is at (2000 m, 4000 m) and the source location is at (2000 m, 1000 m). Consider P-wave velocity as 5000 m/sec. The difference in first arrival time of P-wave phase for the two receivers is \(\underline{\hspace{1cm}}\) seconds.

Normal moveout (NMO) for reflected phase of seismic data is 2 milliseconds. Consider the diffraction source at the edge of the same reflector, where the shot point is directly above the diffraction source. In this case, the NMO due to diffraction is \(\underline{\hspace{1cm}}\) milliseconds.

The radius \( r \) of the oblate spheroid at 45° latitude with ellipticity of polar flattening of 1/298.25 and equatorial radius of 6378140 m is \(\underline{\hspace{2cm}}\) km.

If \( \alpha \) and \( \beta \) are P- and S-wave velocities, respectively, then \( \alpha^2 - \frac{4}{3} \beta^2 \) is equal to: \[ (\kappa \text{ is the bulk modulus, } \mu \text{ is shear modulus, and } \rho \text{ is density}) \]

Which one of the following phases is a P-wave that converts to an S-wave during passage through the solid inner core?

In reduction of gravity data, the latitude correction is maximum at:

In Radiometric survey, the g-ray spectrometer count rate depends on:

Low value in SP log as observed in dispersed shales is mainly due to the impeded movement of:

In Electromagnetic methods of prospecting, which one of the given options is CORRECT about frequency and type of current source for the Primary field used?

In a multi-electrode resistivity tomography (ERT) survey, using equally spaced electrodes, which of the given configurations will provide the maximum number of data points?