# NSO Level 1- Science Olympiad (SOF) Class 10: Questions 18 - 24 of 986

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## Question number: 18

### Question

Copper oxide in a beaker and add slowly while stirring,

The color of the solution is

### Choices

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

a. | Blue to green color | |

b. | Blue to greenish blue | |

c. | Blue to black color | |

d. | No change |

## Question number: 19

### Question

A farmer built a fence around his square plot. He used 32 fence poles on each side of the square. How many poles did he need together?

### Choices

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

a. | 128 | |

b. | 124 | |

c. | 144 | |

d. | 132 |

## Question number: 20

### Question

If , then value of is ________.

### Choices

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

a. | 1 | |

b. | 2 | |

c. | 0 | |

d. | Question does not provide sufficient data or is vague |

## Question number: 21

### Question

In a lottery, there are 9 prizes and 18 blanks. What is the probability of getting a prize?

### Choices

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

a. |
| |

b. |
| |

c. |
| |

d. | Question does not provide sufficient data or is vague |

## Question number: 22

### Question

The difference between the exterior angles of two regular polygon having sides equal to and is 18. Find the value of .

### Choices

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

a. | 5 | |

b. | 4 | |

c. | 6 | |

d. | 8 |

## Passage

DIRECTION: The following questions are based on the diagram given below.

I. Square represents female.

II. Triangle represents doctor.

III. Square represents African.

IV. Circle represents uneducated.

## Question number: 23 (1 of 3 Based on Passage) Show Passage

### Question

Who among the following is female doctor but not an African?

### Choices

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

a. | 5 | |

b. | 10 | |

c. | 8 | |

d. | 4 |

## Question number: 24 (2 of 3 Based on Passage) Show Passage

### Question

Who among the following is an African but not uneducated, female and doctor?

### Choices

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

a. | 15 | |

b. | 9 | |

c. | 10 | |

d. | 19 |