# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 452 - 457 of 1042

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## Question 452

### Question

MCQ▾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 | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 453

### Question

MCQ▾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 | |
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a. | Rs 4600 | |

b. | Rs 4100 | |

c. | Rs 4400 | |

d. | Rs 4000 |

## Question 454

### Question

MCQ▾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 | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 455

### Question

MCQ▾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 |

## Question 456

### Question

MCQ▾If the area of a triangle with base a is equal to area of a square of side a, the altitude of the triangle is________.

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 457

### Question

MCQ▾Two cubes have their volumes in the ratio 1: 64. Find the ratio of their surface areas.

### Choices

Choice (4) | Response | |
---|---|---|

a. | 7: 9 | |

b. | 1: 16 | |

c. | 16: 3 | |

d. | 1: 9 |