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

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## Question 77

Classical Mechanics

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

Classical Mechanics

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

Classical Mechanics

Appeared in Year: 2017

### Question

MCQ▾

The Poisson bracket is equal to:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 81

Classical Mechanics

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

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