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1.
Income of a company doubles after every one year. If the initial income was Rs. 4 lakhs, what would be the income after 5 years?
  • A.
    Rs. 1.24 crores
  • C.
    Rs. 2.52 crores
  • E.
    None of these
  • B.
    Rs. 1.28 crores
  • D.
    Rs. 2.56 crores
  • Answer & Explanation
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Answer : [B]
Explanation :
 
Income after 1 year = Rs. (4 x 21) lakhs.  
 
Income after 2 years = Rs. (4 x 2 x 2) lakhs = Rs. (4 x 22) lakhs  
 
 
 Income after 5 years = Rs. (4 x 25) lakhs = Rs. 128 lakhs = Rs. 1.28 crores.  
 
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2.
The marks scored in an examination are converted from 50 to 10 for the purpose of internal assessment. The highest marks were 47 and the lowest were 14. The difference between the maximum and the minimum internal assessment scores is:
  • A.
    3.3
  • C.
    6.6
  • B.
    4.8
  • D.
    7.4
  • Answer & Explanation
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Answer : [C]
Explanation :
 
Maximum internal assessment score =
47
50
 x 10  = 9.4  
 
Minimum internal assessment score =
14
50
 x 10  = 2.8  
 
 
  Required difference = (9.4 2.8) = 6.6  
 
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3.
In a certain shop, 9 oranges cost as much as 5 apples, 5 apples cost as much as 3 mangoes and 4 mangoes cost as much as 9 lemons. If 3 lemons cost Rs. 4.80, the price of an orange is
  • A.
    Rs. 1.20
  • C.
    Rs. 1.40
  • B.
    Rs. 1.30
  • D.
    Rs. 1.50
  • Answer & Explanation
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Answer : [A]
Explanation :
 
Cost of 4 mangoes = Cost of 9 lemons = Rs.  
4.80
3
 x 9    = Rs. 14.40  
 
Cost of 1 mango = Rs.  
14.40
4
   = Rs. 3.60  
 
Cost of 5 apples = Cost of 3 mangoes = Rs. (3.60 x 3) = Rs. 10.80
 
Cost of 9 oranges = Cost of 5 apples = Rs. 10.80
 
 
 Cost of 1 orange = Rs.  
10.80
9
   = Rs. 1.20  
 
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4.
In a group of buffaloes and ducks, the number of legs are 24 more than twice the number of heads. What is the number of buffaloes in the group?
  • A.
    6
  • C.
    10
  • B.
    8
  • D.
    12
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Answer : [D]
Explanation :
 
Let the number of buffaloes be x and the number of ducks be y.
 
Then, 4x + 2y = 2(x + y) + 24
 
 
  2x = 24  
 
 
  x = 12  
 
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5.
(469 + 174)2 - (469 - 174)2
469 x 174
 = ?  
  • A.
    2
  • C.
    295
  • B.
    4
  • D.
    643
  • Answer & Explanation
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Answer : [B]
Explanation :
 
Given exp. =
(a + b)2 - (a - b)2
ab
     
 
 
4ab
ab
 = 4 (where a = 469, b = 174)  
 
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