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- Question 1 of 17
The average magnetic susceptibility of dolerite is 1400. What is its magnetic permeability in h/m? (Give answer up to 5 decimal places)CorrectIncorrect
- Question 2 of 17
A small scale seismic reflection survey was conducted with a shot point located at the middle of a 500 m long geophone spread. The NMO-corrected travel times at the end of the spread were found to be 1.227 s and 1.255 s. If the average seismic wave velocity above the reflector is 2500 m/s,
what is the dip of the reflector? (Give the value in degrees in nearest integer)CorrectIncorrect
- Question 3 of 17
The S-wave velocity in the lower continental crust is 6800 m/s and its density is 3380 kg/m3. Find its rigidity in GPa. (Give answer up to 2 decimal places)CorrectIncorrect
- Question 4 of 17
Given the frequency of an electromagnetic wave to be 1 kHz and ground conductivity to be 10 S/m, calculate the skin depth. (Give answer in nearest integer, in meters)CorrectIncorrect
- Question 5 of 17
Based on acoustic log of a well, the transit time in a water-bearing sandstone zone is found to be 75 μs/ft. The transit time of acoustic wave through the sandstone matrix and water are 50 μs/ft and 200 μs/ft, respectively. Determine the porosity of the sandstone. (Give answer up to 2 decimal places)CorrectIncorrect
- Question 6 of 17
In frequency domain IP method, frequency effect is defined asCorrectIncorrect
- Question 7 of 17
The bright spot on a seismic reflection section in a sand-shale sequence can be seen overCorrectIncorrect
- Question 8 of 17
The line joining the north and south magnetic dip poles misses the Earth’s centre by about (in km)CorrectIncorrect
- Question 9 of 17
For a three-layered earth with resistivities ρ1, ρ2, and ρ3, and corresponding thicknesses h1, h2, and h3 respectively, the quantity (h1/ρ1) + (h2/ρ2) + (h3/ρ3) stands forCorrectIncorrect
- Question 10 of 17
The distance between the centre of the Earth and the barycentre (i.e. centre of mass of the Earth- Moon system) is (in km)CorrectIncorrect
- Question 11 of 17
The change in gravity caused by Earth’s tides on the land surface in a complete tidal cycle is in the range of (in milligal)CorrectIncorrect
- Question 12 of 17
Terrestrial heat flow is the product ofCorrectIncorrect
- Question 13 of 17
According to Archie’s equation, the electrical resistivity of porous sandstone doesn’t depend on:CorrectIncorrect
- Question 14 of 17
Match the items in Group I with those in Group II.
Group I Group II
P. Magnetic susceptibility
Q. Airborne magnetic survey
R. Geomagnetic field
S. Proton precession magnetometer
1. Gyromagnetic ratio
2. Axial dipole
4. Total field intensity
5. Poisson’s relationCorrectIncorrect
- Question 15 of 17
The NMO of a diffraction hyperbola as compared to that of a reflection hyperbola isCorrectIncorrect
- Question 16 of 17
Which one of the following can be determined from the NMR log against sandstone?CorrectIncorrect
- Question 17 of 17
The peak in the response curves obtained from a geophone exhibitsCorrectIncorrect