MCQOPTIONS
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MCQOPTIONS
| 1. |
If a line makes an angle of 120 , 45 , 30 with the positive x, y, z-axis respectively then find the direction cosines. |
| A. | l= ( frac{1}{2}, ,m= frac{1}{ sqrt{2}}, ,n= frac{ sqrt{3}}{2} ) |
| B. | l=- ( frac{1}{2}, ,m=- frac{1}{ sqrt{2}}, ,n=- frac{ sqrt{3}}{2} ) |
| C. | l=- ( frac{1}{2}, ,m= frac{1}{ sqrt{2}}, ,n= frac{ sqrt{3}}{2} ) |
| D. | l= (0, ,m= frac{1}{ sqrt{2}}, ,n= frac{ sqrt{3}}{2} ) |
| Answer» D. l= (0, ,m= frac{1}{ sqrt{2}}, ,n= frac{ sqrt{3}}{2} ) | |