1171: The age of a man is three times the sum of the ages of his two sons. Five years hence, his age will be doubled of the sum of the ages of his sons. The father's present age is
(a) 40 years
(b) 45 years
(c) 50 years
(d) 55 years
1172: At which one of the cities labelled as A, B, C and D on the given map of Europe was the historic treaty between NATO and Warsaw Pact countries signed in 1998 ?
(a) A
(b) B
(c) C
(d) D
1173: The surface area of a cube is 216 sq.m. What is its volume ?
(a) 100 cu m
(b) 216 cu m
(c) 480 cu m
(d) 512 cu m
1174: Which of the following crops helps in nitrogen fixation?
(a) Rice
(b) Wheat
(c) Maize
(d) Beans
1175: Why do you feel chill after having a dip in sea water?
(a) The difference in temperature between sea water and the atmosphere
(b) Evaporation of water from the body
(c) Deposition of salt on the body
(d) None of these