IMO Level 1 Mathematics Olympiad (SOF) Class 8: Questions 450  455 of 1040
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Question number: 450
Question
The perimeter of a trapezoid is 60 cm and its nonparallel sides are each equal to 13 cm and its altitude is 12 cm. Its area is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 451
Question
The ratio of radii of two cylinders is 1: 3 and heights are in the ratio 3: 5. The ratio of their volume is________.
Choices
Choice (4)  Response  

a.  1: 14 

b.  12: 3 

c.  1: 12 

d.  1: 15 

Question number: 452
Question
A metal sheet 49 cm long, 7 cm broad and 1 cm thick is melted into a cube. The difference between surface areas of two solids is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 453
Question
A rectangle field has its length and breadth in the ratio 5: 3. Its area is 4.50 hectares. The cost of fencing it at Rs. 5 per meter is________.
Choices
Choice (4)  Response  

a.  Rs 4600 

b.  Rs 4100 

c.  Rs 4400 

d.  Rs 4000 

Question number: 454
Question
In the given figure PQRS is a rectangle inscribed in a circle with center O and radius r. The total area of shaded region is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 455
Question
The dimensions of an open box are 30 cm, 20 cm and 11 cm. Its thickness is 2 cm. If 1 cubic cm of metal used in the box weights 1 gms, find the weight of the box.
Choices
Choice (4)  Response  

a.  2.856 kg 

b.  4.561 kg 

c.  1.860 kg 

d.  1.99 kg 
