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Kerala (English Medium)->Plus 2 Biology Science Questions

Total Questions 664
what is cyclonic rainfall
a hemispherical vessel with inner radious 30 cm is full of water.from this water is flowing out at the rate of 4*3.14 lit/min.how much time will it take to empty the vessel
what are the important points in the chapter chemical bonding?
what are the important equations in trigonometry?