IMO Mathematics Olympiad Class 7: Questions 25  31 of 1012
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Question number: 25
Question
Which integer is the additive inverse of itself?
Choices
Choice (4)  Response  

a.  0 

b.  2 

c.  3 

d.  1 

Question number: 26
Question
The value of , where is absolute value of an integer is________.
Choices
Choice (4)  Response  

a.  1 

b.  2 

c.  0 

d.  3 

Question number: 27
Question
Which pair of numbers does not have a product equal to 45?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 28
Question
A tank contains 500 liters of water. Due to a small hole in the tank, the quantity of water is decreasing at the rate of 9 liters every hour. What will be the quantity of the water in the tank after 10 hours?
Choices
Choice (4)  Response  

a.  410 liters 

b.  90 liters 

c.  491 liters 

d.  400 liters 

Question number: 29
Question
For any two rational numbers x and y which of the following are correct, if x is positive and y is negative?
1. X < Y 2. X = Y 3. X > Y
Choices
Choice (4)  Response  

a.  Only 3 is correct 

b.  Only 1 and 2 are correct 

c.  Only 2 and 3 are correct 

d.  All of the above 

Question number: 30
Question
Which of the following statements is true?
Choices
Choice (4)  Response  

a.  Irrational number is not written in ration form 

b.  2 is a prime number 

c.  is a rational number 

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

Question number: 31
Question
Which of the following number sentence below best describes the problem shown on the number line?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

