# Mental Ability-Basic Arithmetic (NCO- Cyber Olympiad Class 7): Questions 47 - 54 of 122

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## Question number: 47

» Mental Ability » Basic Arithmetic

### Question

If each side of a cube is doubled, its volume

### Choices

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

a. | Becomes 6 times | |

b. | Becomes 8 times | |

c. | Becomes 4 times | |

d. | Is doubled |

## Question number: 48

» Mental Ability » Basic Arithmetic

### Question

In an election, two candidates contested. A candidate secured 30 % of the valid votes and is elected by a majority of 150 votes. Find the total number of valid votes.

### Choices

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

a. | 375 | |

b. | 570 | |

c. | 400 | |

d. | 510 |

## Question number: 49

» Mental Ability » Basic Arithmetic

### Question

Simplify:

### Choices

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

a. | 10 | |

b. | 20 | |

c. | 11 | |

d. | 21 |

## Question number: 50

» Mental Ability » Basic Arithmetic

### Question

An ore contain 9 % lead. How many kilograms of the ore are required to get 60 kg of lead?

### Choices

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

a. | 666.66 kg | |

b. | 850.78 kg | |

c. | 544 kg | |

d. | 144.22 kg |

## Question number: 51

» Mental Ability » Basic Arithmetic

### Question

Which is greatest in

### Choices

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

a. | 0.15 | |

b. |
| |

c. |
| |

d. | None of the above |

## Question number: 52

» Mental Ability » Basic Arithmetic

### Question

An ore contain 8 % copper. How many kilograms of the ore are required to get 68 kg of copper?

### Choices

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

a. | 85 kg | |

b. | 850 kg | |

c. | 544 kg | |

d. | 5.44 kg |

## Question number: 53

» Mental Ability » Basic Arithmetic

### Question

The cost of cultivating a square field at the rate of rupees 360 per hectare is rupees 3240. What is the cost of putting a fence around it at 75 paise per meter?

### Choices

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

a. | 600 rupees | |

b. | 900 rupees | |

c. | 700 rupees | |

d. | 800 rupees |

## Question number: 54

» Mental Ability » Basic Arithmetic

### Question

If 30 men working 8 hours a day can do a piece of work in 15 days, in how days will 15 men working for 7 hours a day to do the same piece of work?

### Choices

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

a. | 55 days | |

b. | 34.28 days | |

c. | 30 days | |

d. | 12 days |