Geophysics – MCQs

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1. The branch of earth science that studies the physical properties of Earth is:





2. The average thickness of the Earth’s continental crust is about:





3. The Earth’s magnetic field is generated mainly by:





4. Which seismic wave travels the fastest?





5. S-waves cannot travel through:





6. The boundary between crust and mantle is called:





7. The Gutenberg discontinuity separates:





8. The inner core of Earth is mainly composed of:





9. Which seismic scale measures the magnitude of an earthquake?





10. Which seismic scale measures the intensity of shaking?





11. The point inside Earth where an earthquake originates is called:





12. The point on Earth’s surface directly above the focus is called:





13. The branch of geophysics concerned with measuring Earth’s gravity field is:





14. Gravity anomalies are used to detect:





15. Magnetic surveys are mainly used for locating:





16. Electrical resistivity surveys are used for:





17. The geothermal gradient is the increase of temperature with depth, usually:





18. Heat flow from Earth’s interior is highest at:





19. The study of past magnetic fields recorded in rocks is called:





20. Paleomagnetism provides evidence for:





21. The deepest part of the ocean floor is the:





22. Seismic refraction method is useful for:





23. Seismic reflection method is widely used in:





24. The Earth’s lithosphere is broken into:





25. Plate boundaries with earthquakes and volcanoes are called:





26. The speed of seismic waves increases with:





27. The layer of partially molten rock beneath lithosphere is:





28. Which geophysical method measures the electrical properties of rocks?





29. Oceanic crust is primarily composed of:





30. Continental crust is mainly composed of:





31. The Kola Superdeep Borehole in Russia reached a depth of about:





32. Which layer of Earth generates seismic shadow zones for S-waves?





33. A gravimeter measures:





34. A magnetometer measures:





35. Seismic tomography is used to:





36. The Curie point in geophysics refers to:





37. Which type of plate boundary creates mid-ocean ridges?





38. Wadati-Benioff zones are associated with:





39. Earth’s magnetic poles reverse approximately every:





40. The study of earthquake waves is known as:





41. The velocity of P-waves in granite is about:





42. Liquefaction during an earthquake occurs in:





43. GPS is used in geophysics to measure:





44. Which is the densest layer of Earth?





45. Oceanic lithosphere becomes denser as it:





46. Which geophysical property is most useful in oil exploration?





47. Which geophysical technique is most useful in archaeology?





48. The shape of Earth is best described as:





49. The average density of Earth is about:





50. Which geophysical evidence confirmed seafloor spreading?





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