# IMO Level 1- Mathematics Olympiad (SOF) Class 9: Questions 289 - 295 of 931

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## Question 289

## Question 290

### Question

MCQ▾If the coordinate of the two points are P (4, -5) and Q (-2,3) then ________

### Choices

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

a. | -2 | |

b. | -5 | |

c. | -3 | |

d. | -4 |

## Question 291

### Question

MCQ▾The radii of two cones are in ration 3: 1, their volumes are equal. Find the ratio of their heights.

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 292

### Question

MCQ▾A solid consists of a circular cylinder with an exact fitting right circular cone placed on the top. The height of a the cone is h. If the total volume of the solid is three times the volume of the cone, then the height of the cylinder is ________

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 293

### Question

MCQ▾The area of rhombus is and one of its diagonals is 8 cm. Its perimeter is ________

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 294

### Question

MCQ▾Centroid of a triangle is the point of concurrency of its ________

### Choices

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

a. | Triangle | |

b. | Perpendicular bisectors | |

c. | Medians | |

d. | Angle |

## Question 295

### Question

MCQ▾216 plastic balls each of radius r are melted together to from one big sphere of radius R. then the ratio of surface area of the big sphere to that of a ball is ________

### Choices

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

a. | 9 | |

b. | 36 | |

c. | ||

d. |