IMO Mathematics Olympiad Class 8: Questions 432  437 of 1029
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Question number: 432
Question
A hoop is resting vertically at staircase as shown in the diagram. AB = 12 cm and BC = 6 cm. The radius of the hoop is________.
Choices
Choice (4)  Response  

a.  11 cm 

b.  10 cm 

c.  15 cm 

d.  12 cm 

Question number: 433
Question
Find the surface area of a cylinder with diameter of base 5 cm and height 30 cm.
Choices
Choice (4)  Response  

a.  505 

b.  510 

c.  511 

d.  610 

Question number: 434
Question
Two rectangles ABCD and DBEF are as shown in the figure. The area of rectangle DBEF in square units is________.
Choices
Choice (4)  Response  

a.  120 

b.  90 

c.  160 

d.  140 

Question number: 435
Question
Two cubes have their volumes in the ratio 1: 8. Find the ratio of their surface areas.
Choices
Choice (4)  Response  

a.  1: 9 

b.  5: 3 

c.  1: 4 

d.  7: 9 

Question number: 436
Question
A child walked 17 m to cross a rectangular field diagonally. If breadth of field is 8 m, its length is________.
Choices
Choice (4)  Response  

a.  12 m 

b.  15 m 

c.  20 m 

d.  11 m 

Question number: 437
Question
Three cubes whose edges are 3 cm, 4 cm, and 5 cm respectively are melted without any loss of metal into a single cube. The edge of new cube is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

