IMO Mathematics Olympiad (SOF) Class 8: Questions 442  447 of 1029
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Question number: 442
Question
Three solid cubes of sides 3 cm, 4 cm and 5 cm are melted to form a new cube. Find the surface area of the cube so formed.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 443
Question
Between a square of perimeter 64 cm and a circle of circumference 64 cm, which figure has larger area and by how much?
Choices
Choice (4)  Response  

a.  Circle, 70 

b.  Circle, 60 

c.  Square, 70 

d.  None of the above 

Question number: 444
Question
A square garden measuring 5 m on a side is surrounded by a 1 m wide path. What is the area of the path?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 445
Question
The radii of the bases of two cylinders are in the ratio of 3: 4 respectively and their heights are in the ratio 4: 5 respectively, find the ratio of their volumes.
Choices
Choice (4)  Response  

a.  20: 3 

b.  20: 9 

c.  9: 20 

d.  3: 20 

Question number: 446
Question
A rectangle field has its length and breadth in the ratio 2: 3. Its area is 3.80 hectares. The cost of fencing it at Rs. 2 per meter is________.
Choices
Choice (4)  Response  

a.  Rs 1000 

b.  Rs 1600 

c.  Rs 1100 

d.  Rs 1500 

Question number: 447
Question
ABC is a right angled triangle with. AH is drawn perpendicular to BC where H lies on BC. If AB = 40 cm and AC = 60 cm, then BH = ________.
Choices
Choice (4)  Response  

a.  25 

b.  50 

c.  30 

d.  40 
