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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

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