IMO Level 1 Mathematics Olympiad (SOF) Class 6: Questions 150  159 of 1059
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Question number: 150
Question
The reciprocal of the smallest prime is
Choices
Choice (4)  Response  

a.  0  
b.  2  
c.  1  
d. 
Question number: 151
Question
Which of the following is a perfect square?
Choices
Choice (4)  Response  

a.  49  
b.  68  
c.  56  
d.  48 
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.  81  
b.  51  
c.  85  
d.  31 
Question number: 154
Question
Prime factorization of 5775 is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 155
Question
The numbers which have only two factors (1 and the number itself) are called as
Choices
Choice (4)  Response  

a.  Prime  
b.  Composite  
c.  Even  
d.  Question does not provide sufficient data or is vague 
Question number: 156
Question
Multiplying three negative integers with a positive integer gives a ________ result.
Choices
Choice (4)  Response  

a.  Positive  
b.  0  
c.  Negative  
d.  None of the above 
Question number: 157
Question
There are 153 apples and 119 oranges. These fruits are to be arranged in heaps containing the same number of fruits. Then the greatest number of fruits possible in each heap is
Choices
Choice (4)  Response  

a.  23  
b.  15  
c.  17  
d.  20 
Question number: 158
Question
Number of prime numbers from 1 to 50 are
Choices
Choice (4)  Response  

a.  15  
b.  12  
c.  20  
d.  18 
Question number: 159
Question
The HCF and LCM of two numbers is 16 and 192 respectively. If one of the numbers is 64, the other one is
Choices
Choice (4)  Response  

a.  24  
b.  45  
c.  48  
d.  72 