NDA National Defence Academy Examination General Intelligence Part A April 2011 Original Question Paper with answers and detailed explanations
1. Complete the series :
11, 12, 17, 18, 23, 24 ...
(1) 30
(2) 35
(3) 12
(4) 14
(5) None of these
Ans : (5)
Explanation : Alternate numbers increase by 6.
2. Complete the series :
1, 8, 27, 64, 125, 216 .....
(1) 343
(2) 512
(3) 729
(4) 1000
(5) None of these
Ans : (1)
Explanation : The series is
13, 23, 33, 43 .......
Hence missing figure : 73 = 343
3. Suppose you are in charge of a Military Command guarding a bridge and you receive a message from the bridge that the enemy forces have almost reached the other side of the bridge. What telephone message would you send ?
(1) Order air-shelling
(2) Break the bridge
(3) Send more troops
(4) Surrender to them
(5) None of these
Ans : (2)
4. Supply the missing figure :
3, 11, 8, 16, 13 .... 18
(1) 15
(2) 17
(3) 14
(4) 21
(5) None of these
Ans : (4)
Explanation : In the series take alternate terms and see, it is increasing by 5.
Thus missing figure is 16 + 5 = 21
11, 16, (16 + 5), .....
5. Usha is twice as old as Rita. Three years ago she was three times as old as Rita. How old is Usha now ?
(1) 7 years
(2) 9 years
(3) 6 years
(4) 12 years
(5) None of these
Ans : (4)
Explanation : Now U = 2R (U - Usha's age R - Rita's age)
Three years ago,
(U - 3) = 3(R - 3)
? (2R - 3) = 3(R - 3) (? U = 2R)