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NDA 2014
Exam
NDA
Year
2014
Subject
Mathematics
Chapter
Three Dimensional Geometry

NDA 2014 · Mathematics · Three Dimensional Geometry

Paragraph : Let a vector r make angles 60^ ^ , 30^ ^ with x and y...

Paragraph : Let a vector rˉ\bar{r} make angles 60∘60^{{}^{\circ}}, 30∘30^{{}^{\circ}} with xx and yy-axis respectively.
Question : What angle does r⃗\vec{r} make with zz-axis?

Options

  1. A30∘30^{{}^{\circ}}
  2. B60∘60^{{}^{\circ}}
  3. C90∘90^{{}^{\circ}}
  4. D120∘120^{{}^{\circ}}

Correct answer

C. 90∘90^{{}^{\circ}}

Step-by-step solution

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