# Mathematical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 21 - 27 of 76

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## Question 21

Appeared in Year: *2011*

### Question

MCQ▾The unit vector normal to the surface at the point is –

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 22

Appeared in Year: *2013*

### Question

MCQ▾If and are constant vectors, then is –

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 23

Appeared in Year: *2013*

### Question

MCQ▾is equal to –

[Given and ]

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 24

Appeared in Year: *2013*

### Question

MCQ▾In the most general case, which one of the following quantities is NOT a second order tensor?

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Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 25

Appeared in Year: *2013*

### Question

MCQ▾A monochromatic plane wave at oblique incidence undergoes reflection at a dielectric interface. If and are the unit vectors in the directions of incident wave, reflected wave and the normal to the surface respectively, which one of the following expressions is correct?

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Choice (4) | Response | |
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b. | ||

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d. |

## Question 26

## Question 27

Appeared in Year: *2013*

### Question

MCQ▾For a scalar function satisfying the Laplace equation, has –

### Choices

Choice (4) | Response | |
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a. | Zero curl and zero divergence | |

b. | Zero curl and non – zero divergence | |

c. | Non – zero curl and non – zero divergence | |

d. | Non – zero curl and zero divergence |