IMO Level 1 Mathematics Olympiad (SOF) Class 8: Questions 433  438 of 1040
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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.  510 

b.  610 

c.  505 

d.  511 

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.  140 

c.  90 

d.  160 

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: 4 

b.  7: 9 

c.  1: 9 

d.  5: 3 

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.  15 m 

b.  20 m 

c.  11 m 

d.  12 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. 


Question number: 438
Question
If a wire is bent into the shape of a square, then the area of the square is 49 sq. cm. When the wire is bent into a semicircular shape, then the area of the semicircle will be________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

