Gravity Method

1.which instrument measures the variations in the earth's gravitational field

• A. Resistivitymeter
• B. Magnetometer
• C. Gravimeter
• D. Radiometri
• E. Seismograph

2.Gravity field variations on the surface

• A. Reflect the density variation laterally in the subsurface
• B. Reflects the density variation vertically in the subsurface
• C. Do not reflect density variation
• D. Reflect topographic variations only
• E. Reflect sea tides variations

3.Sensitivity of a gravimeter is

• A. 0,01 mgal
• B. 0.1 mgal
• C. 0.002 mgal
• D. 0.001 mgal
• E.0.2 mgal

4.Gravity method is a…..... Method

• A. Active
• B. Passive
• C. Both
• D. Not both
• E. Hyperactive

5.What factors determine the density variations with depth in the earth , except

• A. Composition
• B. Crystalinity
• C. Vora fraction
• D. Water saturation
• E. Porosity

6. The basis of the gravity survey method is

• A. Newton's Law
• B. Hooke's Law
• C. Faraday's Law
• D. Newton's Law of Gravitation
• E. Archimedes' Law

7. The gravity method can be applied for exploration of, except

• A. Fossil fuels
• B. Metalliferous mineral deposits
• C. Bulk mineral deposits
• D. Underground water supplies
• E. Construction site investigation

8. The density of a rock is dependent on

• A. Mineral composition
• B. Porosity
• C. Volume
• D. A and B
• E. A, B and C

9. Gravity anomalies result is caused by the difference in

• A. Composition
• B.Sea Tides
• C. Density contrast
• D. Specific gravity
• E. Rock color

10. What is the main cause of density variation in sedimentary rocks?

• A. Variation in holes
• B. Variation in porosity
• C. Variations in lamination
• D. Variation in Grain size
• E. None of the above