56.Which one of the following is the busiest ocean route in the world?

57.Which one of the following is NOT correctly matched?

58.The Indian sub-continent was originally part of a huge landmass called:

59.Assertion (A) : The frequency of floods in North Indian plains has increased during the last couple of decades. Reason (R) : There has been reduction in the depth of river valleys due to deposition of silt

60.Which one of the following state has the lowest sex ratio among the states?