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JAM-2016-GG- Q1-30 explained-upload

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Kumar Ayyasami
Presidency College, Chennai
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JAM-2016-key for 1-30 Questions: 1. A. Aluminium. Most abundant element is Oxygen 2. A. The least stable is olivine and stablest is quartz. 3. C. Where there is a steep slope, the contours will be nearer 4. D. Plagioclase. Gabbro is known as pyroxeneplagioclase adcumulate (93-100% dominant mineral) 5. B. Jharia coal field. Coking coal is bituminous and so mainly Gondwana coal. 6. B. 100 times. The numbers on the Richter Scale are logarithmic. What that means is that as you increase by one integer, you are actually describing an increase in earthquake intensity by a factor of 10. 7. D. Aulacogen. Failed rifts are the result of continental rifting that failed to continue to the point of break-up. 8. A. Next to diamond is Corundum, that is Aluminium oxide. 9. C. Tidel current. Tides raise and fall with the phase of moon. 10. A. Chlorine. 11. C. 12. B. 13. D Pleochroism. 14. C. A unique rotation axis is one that exists by itself and is not produced by another symmetry operation. In this case, all three 2-fold axes are unique, because each is perpendicular to a different shaped face, so we write a 2 (for 2fold) for each axis 15. C 16. A 17. D 18. A Sargur &Chitradurga in Karnataka and Ajabgarh & Udaipur in Rajasthan 19. C 20. D. They spread from the center. 21. C 22. D. Beds with 10 to 30 inclination in the upstream direction (i.e., beds with gentle upstream dip): Such a situation is ideal and much better where the occurrence of a geological structure brings advantage to the associated rocks of a given site. This is so because: (i) The resultant force (which is more important and relevant than the weight of the dam) acts more or less perpendicular to the bedding planes which are dipping in the upstream side. Hence the rocks are best positioned to take the loads effectively. (ii) By virtue of the prevailing upstream dip, any percolated water of the reservoir is directed by the bedding planes to the upstream side (i.e. Towards the reservoir side only), i.e., there is no scope of leakage of water below the dam towards the downstream side. This is doubly advantageous because (a). scope for occurrence of uplift pressure on the dam is nil and (b) the percolated water is returned to the reservoir side only. I.e., there is no scope for real loss or leakage of reservoir water. For these reasons, gentle upstream dip is ideal for dam location. 23. B 24. B Cumbum F Cuddapah Group (Bairankonda F above Cumbum F) Baisakhi F- Jurassic Jaisalmer (Jaisalmer, Baisakhi and Bedesar), Kopili F- Cenozoic (Prang, Kopili, Barail) Assam; Barakar F-Palaeozoic, Permian 25. B Once the sediments can flow, the instability creates the "hanging" lobes and knobs of the load casts as plumes of the denser sediment descend into the lessdense layer. Load casts are a common kind of sole marking. (a) Groove casts are straight parallel ridges that are raised a few millimeters from the bedding surface (b) Gutter casts are isolated elongate ridges on the soles of sandstone and limestone beds. They are symmetrically or asymmetrically U or V-shaped in cross-section (c) flute casts are scours dug into soft, fine sediment which typically get filled by an overlying bed (hence the name cast). Measuring the long axis of the flute cast gives the direction of flow, with the tapered end pointing toward the flow and the steep end up current. The concavity of the flute cast also points stratigraphically up. 26. B (i) Escutcheon: A small curved area on the dorsal margin posterior to the beak. Both valves must be joined to view the escutcheon. (ii) The plastron is the name given to the enlarged interambulacral zone on the lower surface behind the mouth. (iii) delthyrium (aperture bisecting ventral cardinal area or pseudointerarea, commonly serving as pedicle opening) and articulating with dental sockets in dorsal valve. (iv) Siphuncle is a calcareous tube containing living tissue running through all the shell chambers, serving to pump fluid out of vacant chambers in order to adjust buoyancy. 27. A 28. B Eutectic homogeneous xalisation, Fractional Xal-zoning, Exsolution, in mineralogy, process through which an initially homogeneous solid solution separates into at least two different crystalline minerals without the addition or removal of any materials. Submarine eruption- pillow 29. D 30. A The coordination number of stishovite is 6, so the silicon atoms are all surrounded by 6 oxygen atoms.

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