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 non-parallel sides are each equal to 13 cm and its altitude is 12 cm. Its area is________.
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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________.
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| Choice (4) | Response | |
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| a. | 1: 14 |
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| b. | 12: 3 |
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| c. | 1: 12 |
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| d. | 1: 15 |
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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________.
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Question number: 453
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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________.
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| Choice (4) | Response | |
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| a. | Rs 4600 |
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| b. | Rs 4100 |
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| c. | Rs 4400 |
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| d. | Rs 4000 |
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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________.
PQRS Rectangle is Inscribed in a Circle of Center O and radiusR
Find out total area of shaded region of inscribing rectangle in a circle
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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.
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| Choice (4) | Response | |
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| a. | 2.856 kg |
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| b. | 4.561 kg |
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| c. | 1.860 kg |
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| d. | 1.99 kg |
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