# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 458 - 463 of 1042

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## Question 458

### Question

MCQ▾The radius of a cylinder is tripled but its lateral surface area is unchanged. Then its height must be________.

### Choices

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

a. | Halved | |

b. | Constant | |

c. | One third | |

d. | Doubled |

## Question 459

### Question

MCQ▾A cylindrical tower is 7 meters in diameter and 15 meters height. The cost of white washing its curved surface at 75 paisa per is

### Choices

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

a. | 250 | |

b. | 247 | |

c. | 240 | |

d. | 257 |

## Question 460

### Question

MCQ▾A hoop is resting vertically at staircase as shown in the diagram. AB = 8 cm and BC = 4 cm. The radius of the hoop is________.

### Choices

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

a. | 12 cm | |

b. | 11 cm | |

c. | 14 cm | |

d. | 10 cm |

## Question 461

### Question

MCQ▾The radius of a cylinder is doubled but its lateral surface area is unchanged. Then its height must be________.

### Choices

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

a. | Tripled | |

b. | Constant | |

c. | Doubled | |

d. | Halved |

## Question 462

### Question

MCQ▾Between a square of perimeter 36 cm and a circle of circumference 36 cm, which figure has larger area and by how much?

### Choices

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

a. | Square, 22 | |

b. | Circle, 26 | |

c. | Circle, 22 | |

d. | All of the above |

## Question 463

### Question

MCQ▾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. | 90 | |

b. | 60 | |

c. | 40 | |

d. | 70 |