Discussion
Which of the following statements is correct ?
(i) Seismic reflection method depends on acoustic impedance contrast
(ii) Gravity method is sensitive to lateral density variations
(iii) Magnetic method is sensitive to susceptibility contrast
(iv) Electrical method depends on electrical resistivity variations
Answer: D
All four statements are correct, so the answer is (i), (ii), (iii) and (iv) are correct.
- Seismic reflections arise where acoustic impedance (density times velocity) changes between layers (i).
- Gravity surveys detect lateral changes in density, which produce anomalies in the gravity field (ii).
- Magnetic surveys respond to contrasts in magnetic susceptibility (and remanent magnetisation) of rocks (iii).
- Electrical methods map variations in electrical resistivity (iv).
Each statement gives the physical property its method measures, so any option leaving one out is incomplete.
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