IMO Mathematics Olympiad (SOF) Class 6: Questions 145  154 of 1049
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Question number: 145
Question
Which of the following is not a perfect cube?
Choices
Choice (4)  Response  

a.  27 

b.  342 

c.  512 

d.  216 

Question number: 146
Question
The numbers which are multiplies of 2 are called________.
Choices
Choice (4)  Response  

a.  Even 

b.  Composite 

c.  Odd 

d.  Prime 

Question number: 147
Question
The smallest value of ‘x’ in the number 156x0 so that it is divisible by10 is:
Choices
Choice (4)  Response  

a.  1 

b.  2 

c.  0 

d.  All a. , b. and c. are correct 

Question number: 148
Question
is divisible by
Choices
Choice (4)  Response  

a.  3 

b.  11 

c.  7 

d.  9 

Question number: 149
Question
The least number which when increased by 6 is exactly divisible by 12,24 and 48 is
Choices
Choice (4)  Response  

a.  42 

b.  23 

c.  54 

d.  36 

Question number: 150
Question
The reciprocal of the smallest prime is
Choices
Choice (4)  Response  

a.  1 

b.  2 

c. 


d.  0 

Question number: 151
Question
Which of the following is a perfect square?
Choices
Choice (4)  Response  

a.  68 

b.  56 

c.  48 

d.  49 

Question number: 152
Question
Which of the following is the pair of twin primes?
Choices
Choice (4)  Response  

a.  (5,11) 

b.  (7,11) 

c.  (17,19) 

d.  (19,23) 

Question number: 153
Question
The HCF of two numbers is 54. If one number is 27 and another is 162, then the LCM is
Choices
Choice (4)  Response  

a.  31 

b.  85 

c.  51 

d.  81 

Question number: 154
Question
Prime factorization of 5775 is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

