Surface Area and Volumes (IMO Mathematics Olympiad Class 9): Questions 10  13 of 104
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Question number: 10
» Surface Area and Volumes
Question
27 metal balls each of radius r are melted together to from one big sphere of radius R. Then the ratio of surface area of the big sphere to that of a ball is ________
Choices
Choice (4)  Response  

a.  3 

b.  9 

c. 


d. 


Question number: 11
» Surface Area and Volumes
Question
A rectangle is divided into four smaller rectangles, as shown in the figure. Three of them have areas, and as indicated. Then the area of the shaded rectangle is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 12
» Surface Area and Volumes
Question
A rectangular field has its length and breadth in the ratio. Its area is 3.75 hectares. The cost of fencing it at Rs. 5 per meter is ________
Choices
Choice (4)  Response  

a.  Rs. 1000 

b.  Rs. 500 

c.  Rs. 4000 

d.  Rs. 400 

Question number: 13
» Surface Area and Volumes
Question
If the altitude of an equilateral triangle is , its area is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

