Gravity & Magnetic Surveying
This Quiz contains the questions from the basics and applications of Gravity and Magnetic methods used in Geophysical Investigations. Enjoy the Quiz n Tk cr. . . . . Be Happy. . . All the best. . . . .
- 1.Gravity field variations on the surface :
- A.
Reflects the density variation laterally in the subsurface
- B.
Reflects the density variation vertically in the subsurface
- C.
Do not reflect density variation
- D.
Reflect topogrphic variations only
- 2.Sensitivity of a Gravimeter is :
- A.
0.01 mgal
- B.
0.1 mgal
- C.
0.002 mgal
- D.
0.001 mgal
- 3.Optical Pumping magnetometer works on the pinciple of:
- A.
Doppler effect
- B.
Proton Precession
- C.
Magnetic saturation
- D.
Zeeman effect
- 4.The half width of vertical magnetic intensity anomaly over a magnetised sphere is 25 meters . Calculate the depth to the center of sphere from surface ??
- A.
32.5 m
- B.
50 m
- C.
25 m
- D.
None of these
- 5.Van allen zones form at :
- A.
North Pole
- B.
South Pole
- C.
North and South both
- D.
Equator
- 6.The scale of Geodetic Survey is :
- A.
1:250000
- B.
1:10000
- C.
1:5000
- D.
1:50000
- 7.At magnetic equator, the inclination of total magnetic field is :
- A.
90 degree
- B.
60 degree
- C.
45 degree
- D.
0 degree
- 8.A gravity profile across a schist belt within a Granitic country rock will give rise to a :
- A.
Central low
- B.
Central High
- C.
Response is flat
- D.
High and Low at the edges
- 9.Which of the following is non-magnetic ???
- A.
Granite
- B.
Gabbro
- C.
Limestone
- D.
Diorite
- 10.A large sedimenary basin 2 km deep with density contrast of 0.3 gm/cc will approximately give rise to gravity anomaly of :
- A.
5 mgal
- B.
15 mgal
- C.
25 mgal
- D.
50 mgal
- 11.Relationship of geometrical and gravitational flattening of Earth is given by :
- A.
Gauss Theorem
- B.
Green's Theorem
- C.
Hayford's Theorem
- D.
Clairaut's Theorem
- 12.The Bouguer anomaly over an isostatically compensated region is :
- A.
Zero
- B.
Positive
- C.
Negative
- D.
Same as isostatic anomaly
- 13.Magnetic equator coincides with the Geomagnetic equator.
- A.
True
- B.
False
- 14.SI unit of manetic induction is
- A.
Tesla
- B.
Gauss
- C.
Oesterd
- D.
None of above
- 15.The magnetic domains are due to :
- A.
Covalent bonds
- B.
Doping
- C.
Hysteresis loss
- D.
Spin excange interaction
- 16.Terrain correction is not generally applied to magnetic field data .
- A.
True
- B.
False
- 17.Curie point temperature for Haematite is :
- A.
578 degree celsius
- B.
670 degree celsius
- C.
550 degree celsius
- D.
None of these
- 18.Which of the following exhibits negative magnetic susceptibility ???
- A.
Pyroxene
- B.
Quartz
- C.
Olivine
- D.
Biotite
- 19.To derive magnetic field from gravity field , the poisson relation can be used only when the direction of magnetization is :
- A.
Horizontal ( 0 degree)
- B.
45 degree
- C.
60 degree
- D.
Vertical ( 90 degree)
- 20.Gravity measurement is made on a ship sailing at the speed of 6 knots in the direction N650E at 200N latitude. The Eotvos correction (in mGal) is :
- A.
+ 38.5
- B.
+ 24.5
- C.
- 35.5
- D.
-39.5
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