Surface Area and Volumes (IMO Mathematics Olympiad Class 9): Questions 10  14 of 104
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 919 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 450.00 or
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. 


Question number: 14
» Surface Area and Volumes
Question
A triangle and a trapezoid are equal in area. They also have the same altitudes. If the base of the triangle is 18 inches, the mean of the parallel sides of the trapezoid is ________
Choices
Choice (4)  Response  

a.  36 inches 

b.  Not obtained from this data 

c.  18 inches 

d.  9 inches 
