# Atoms and Nuclei-Nuclear Fission and Fusion [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 6

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## Question number: 1

» Atoms and Nuclei » Nuclear Fission and Fusion

### Question

Which of the following are not examples of nuclear fusion?

(1) Formation of Ba and Kr from U ^{235}

(2) Formation of Pu ^{235} from Th ^{235}

(3) Formation of water from hydrogen and oxygen

(4) Formation of He from H

Select the correct answers and mark it according to the following codes:

### Choices

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

a. | 1 and 3 are correct | |

b. | 2 and 4 are correct | |

c. | 1 and 2 are correct | |

d. | 1,2 and 3 are correct |

## Question number: 2

» Atoms and Nuclei » Nuclear Fission and Fusion

### Question

Power output of _{92} U ^{235} reactor if it takes 30 days to use up 2 kg of fuel, and if each fission gives 185 MeV of useable energy is-

### Choices

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

a. | 5.846 kW | |

b. | 58.46 MW | |

c. | 0.5846 kW | |

d. | All of the above |

## Question number: 3

» Atoms and Nuclei » Nuclear Fission and Fusion

### Question

The energy released per fission of U ^{235} is about 200 MeV. A reactor using U ^{235} as fuel is producing 1000 kilowatt power. The number of U ^{235} nuclei undergoing fission per sec is, approximately-

### Choices

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

a. | 10 | |

b. | 3 × l0 | |

c. | 2 × 10 | |

d. | 931 |

## Question number: 4

» Atoms and Nuclei » Nuclear Fission and Fusion

### Question

Fission of nuclei is possible because the binding energy per nucleon in them,

### Choices

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

a. | Increases with mass number at high mass number | |

b. | Decreases with mass number at low mass numbers | |

c. | Increases with mass number at low mass numbers | |

d. | Decreases with mass number at high mass number |