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Geophysics Exam I, Summaries of Physics
An exam or test for a geophysics course, covering topics such as gravity, magnetism, seismic waves, and rock properties. The exam consists of multiple-choice questions, true/false questions, and calculation problems related to these geophysical concepts. A comprehensive assessment of the student's understanding of fundamental geophysical principles and their application in various scenarios. The range of questions covers a broad spectrum of geophysical methods, including gravity, magnetic, and seismic surveys, as well as the interpretation of geophysical data. This exam could be useful for students studying geophysics at the university level, particularly in courses related to exploration geophysics, applied geophysics, or general geophysics. The document could serve as a valuable study resource, providing practice questions and reinforcing key concepts in the field of geophysics.
Typology: Summaries
2015/2016
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GEOP 102 Exam I
Name: ID:
I. Complete the following sentences. [30 pts]
- A g of 9.81 m/s^2 is equivalent to 981000 mGal
- As the feature causing the anomaly gets deeper the gravity profile gets wider
- Geoid is Gravitational-equipotential and hypothetical surface from which topographic heights and ocean depths are measured
- The units of the measured signal in magnetometer is nT
- The most commonly used type for magnetic data in land is proton magnetometer
- The most widely used geophysical method is Seismic
II. Choose the correct answer. [20 pts]
- Which of the following does not affect the earth gravity: a. Elevation b. Latitude c. Earth shape d. Earth Rotation e. Longitude
- A fault that goes through purely sedimentary rocks (that have different density) without affecting the uniform basement below can result in: a. Gravity anomaly and magnetic anomaly b. Magnetic anomaly but no gravity anomaly c. Gravity anomaly but no magnetic anomaly d. Neither gravity nor magnetic anomaly e. None of the above f. None of the above III. Determine whether the following statements are correct or not. [25 pts]
- The temperature point above which the rock can exhibit permanent magnetization is called Curie point
T F
T F
GEOP 102 Exam I
- Identical bodies can still give different magnetic readings depending on their latitude
- It is very simple to interpret gravity data without prior geological knowledge T F
- The magnetic field of the earth is thought be generated due to convection current in outer core
T F
- Geophysics has some applications in aerospace domain T F
IV. Calculation Questions: [25 pts]
- You are given a rock that has perfect cylindrical shape with diameter of 2 cm and length of 5 cm. You measured its porosity and found it to be 30%. You saturated the rock with brine (density of 1.1 g/cc). If the rock is fully saturated and the mass of the saturated rock is 40 g, write the final answer with units for : a. Bulk density: 2.55 g/cc b. Grain density of the rock: 3.17 g/cc
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