# Classical Mechanics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 77 - 81 of 84

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## Question 77

Appeared in Year: *2006*

### Question

MCQ▾A particle is moving in an inverse square force field. If the total energy of the particle is positive, then trajectory of the particle is –

### Choices

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

a. | Parabolic | |

b. | Circular | |

c. | Elliptical | |

d. | Hyperbolic |

## Question 78

Appeared in Year: *2006*

### Question

MCQ▾The energy of electrons of wavevector in a solid is given by , where and are constants. The effective mass of the electron at is –

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 79

Appeared in Year: *2017*

### Question

MCQ▾If the Lagrangian is modified to , which one of the following is TRUE?

### Choices

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

a. | The canonical momentum and equation of motion do not change | |

b. | Canonical momentum does not change, equation of motion changes | |

c. | Canonical momentum changes, equation of motion does not change | |

d. | The canonical momentum and equation of motion change |

## Question 80

Appeared in Year: *2017*

### Question

MCQ▾The Poisson bracket is equal to:

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 81

Appeared in Year: *2017*

### Question

MCQ▾Electromagnetic interactions are:

### Choices

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

a. | non – conserving but conserving | |

b. | non – conserving | |

c. | non – conserving but conserving | |

d. | conserving |