666: The words in the first column are written in a secret code in the second column. However, the secret writings in the second column are not in the same order. What is the code assigned for the letter D?
BRAIN 13529
DRAIN 35293
RIVER 13754
DRIVE 83754
(a) 3
(b) 5
(c) 1
(d) 9
667: Brahmaputra is an example of ____ drainage
(a) Annular
(b) Antecedent
(c) Superimposed
(d) Radial
668: Which one of the following is not a sub-index of the World Banks 'Ease of Doing Business Index'?
(a) Maintenance of law and order
(b) Paying taxes
(c) Registering property
(d) Dealing with construction permits
669: Which one of the following is a very significant aspect of the Champaran Satyagraha?
(a) Active all-India participation of lawyers, students and women in the National Movement
(b) Active involvement of Dalit and Tribal communities of India in the National Movement
(c) Joining of peasant unrest to India's National Movement
(d) Drastic decrease in the cultivation of plantation crops and commercial crops
670: A box contains 5 sets of balls while there are 3 bails in each set. Each set of balls has one colour which is different from every other set. What is the least number of balls that must be removed from the box in order to claim with certainty that a pair of bails of the same colour has been removed?
(A) 6
(B) 7
(C) 8
(D) 9