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JAM 2015-GG-Q1-30-explanation-upload

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Kumar Ayyasami
Presidency College, Chennai
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JAM 2015- KEY: 1. B. Mars-2; Uranus-27. Venus-0; Mercury-0 2. D. Galena. 3. C. Aquaclude is completely impermeable. Artesian-self flowing 4. D. Arenite. Greywacke more than 15%. 5. D. Bauxite. Residual deposit. Wollastonite- thermally metamorphosed impure lst. Asbestosmetamorphism of Peridotite. 6. A. 7. D 8. B. Graptolite in Devonian. Ammonite in Cretaceous. Ediacaran in Ediacaran time 9. C. 10. A. 11. D. 12. A. Dip greater than the slope gradient 13. C. 14. B. Face the fault. Left shift indicates sinistral. 15. C. Drive or drift is a horizontal or nearly horizontal underground opening developed on the underground levels along the strike of ore body. A cross-cut is a horizontal underground passageway that provides access to mining operations and is usually bored from the mining shaft at near right angles to the strike of a vein or ore body (across strike). A shaft is driven vertically downwards where as a raise is driven vertically or at a steep angle upwards. 16. C 17. B 18. A 19. C. 20. C 21. B 22. A 23. D 24. B mm=2- or mm= 1/2 25. D 26. A Taxodont-taxing(more teeth), dysodont (mytilus family), The schizodont hinge has reverse "V" shaped scissurate teeth, (bifurcating) and often an elongated lateral tooth, The heterodont hinge has two to three wedge-shaped cardinal teeth set in the center near the umbones, 27. B 28. C 29. A 30. D

 

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