UPSC General Science Solved Papers Contributed by Parthipan updated on Oct 2020
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NDAÂ National Defence Academy Examination General Intelligence Part A April 2011 Original Question Paper with answers and detailed explanations

1.Â  Complete the series :

11,Â  12,Â  17,Â  18,Â  23,Â  24Â  ...Â Â

(1) 30

(2) 35

(3) 12

(4) 14

(5) None of these

Ans :Â  (5)

Explanation :Â Â  Alternate numbers increase by 6.

Â

2.Â  Complete the series :

1,Â  8,Â  27,Â  64,Â  125,Â  216 .....

(1) 343

(2) 512

(3) 729

(4) 1000

(5) None of these

Ans :Â  (1)

Explanation :Â Â  The series is

13, 23, 33, 43Â .......

Hence missing figure :Â  73Â = 343

Â 3.Â  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 :Â  (2)

Â 4.Â  Supply the missing figure :

3,Â  11,Â  8,Â  16,Â  13Â  ....Â  18

(1) 15

(2) 17

(3) 14

(4) 21

(5) None of these

Ans :Â  (4)

Explanation :Â Â  In the series take alternate terms and see, it is increasing by 5.

Thus missing figure is 16 + 5 = 21

11,Â  16,Â  (16 + 5),Â  .....Â

5.Â  Usha is twice as old as Rita.Â  Three years ago she was three times as old as Rita.Â  How old is Usha now ?

(1) 7 years

(2) 9 years

(3) 6 years

(4) 12 years

(5) None of these

Ans :Â  (4)

Explanation :Â Â  Now U = 2RÂ  (U - Usha's ageÂ  R - Rita's age)

Three years ago,

(U - 3) = 3(R - 3)

?Â Â Â  (2R - 3) = 3(R - 3)Â Â Â Â Â Â Â Â Â  (? U = 2R)