List of practice Questions

A stratified confined aquifer consists of three parallel homogeneous and isotropic horizontal layers with thickness of 10 m, 5 m, and 5 m. The layers have the same width. The hydraulic conductivities of the strata are 15 m/day, 20 m/day, and 30 m/day, respectively. The water flow follows Darcy's law and is parallel to the strata. Considering the same hydraulic gradient for all the layers, the effective hydraulic conductivity of the aquifer is \(\underline{\hspace{1cm}}\) m/day.

An aqueous polyphase (L + V + solid) inclusion contains a halite daughter crystal at room temperature and pressure. Which of the given statements is CORRECT in relation to this inclusion?

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 following reaction takes place in the amphibolite grade of metamorphism of pelitic rocks:
\[ \text{kyanite + chlorite} \leftrightarrow \text{staurolite + quartz + H}_2\text{O} \] Which of the following is a CORRECT statement on this reaction?

Tillite with faceted boulders and green shale with dropstones characterize the lithology of:

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.

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.

Which one of the following statements is CORRECT?

Light passes through two media with refractive indices of 1.75 and 1.55, respectively. The thickness of both the media is 30 mm. The resultant path difference of the yellow light component \( \lambda = 589 \, \text{nm} \) is \(\underline{\hspace{1cm}}\) mm.

The water table in an unconfined aquifer at a place near the coast is 1 m above the Mean Sea Level. Given the densities of fresh and saline water as 1.001 and 1.025 g/cc, respectively, the fresh-saline water interface at the same location should be at a depth of \(\underline{\hspace{1cm}}\) m from the water table.

The volume percentage of galena and quartz in an ore body of Pb are 90 and 10, respectively. The densities of galena and quartz are 7.6 and 2.65 g/cc, respectively. The grade of the ore body in terms of weight percent of Pb is \(\underline{\hspace{2cm}}\) (Atomic weights of Pb = 206 and S = 32).

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.

The most coaliferous unit of the Gondwana Supergroup is:

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:

Which one of the following structures indicates Syndimentary deformation?

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

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