IMO Level 1 Mathematics Olympiad (SOF) Class 7: Questions 33  39 of 1022
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Question number: 33
Question
An insect crawls up 7 cm every second on an 80 cm vertical rod and then falls down 3 cm over the next second. How many seconds will it take to climb the rod?
Choices
Choice (4)  Response  

a.  30 seconds 

b.  20 seconds 

c.  60 seconds 

d.  39 seconds 

Question number: 34
Question
Which of the following statements is true?
Choices
Choice (4)  Response  

a.  The product of two rational numbers is a rational number 

b.  Zero has no reciprocal 

c.  1 and 1 are reciprocal of themselves 

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

Question number: 35
Question
The product of two rational numbers is. If one of the numbers is , then the other number is________.
Choices
Choice (4)  Response  

a.  22 

b.  36 

c.  49 

d.  27 

Question number: 36
Question
The value of y such that and are equivalent rational numbers is________.
Choices
Choice (4)  Response  

a. 


b. 


c.  5 

d.  15 

Question number: 37
Question
Simplify
Choices
Choice (4)  Response  

a.  8 

b.  7 

c. 


d. 


Question number: 38
Question
A gardener plans to plant 630 trees in 21 rows each containing the same number of trees, then how many trees will there be in each row?
Choices
Choice (4)  Response  

a.  3 

b.  30 

c.  21 

d.  300 

Question number: 39
Question
The sign of the product of one positive integer and one negative integer is________.
Choices
Choice (4)  Response  

a.  Negative 

b.  Positive or Negative 

c.  Positive 

d.  Cannot be determined 
