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Direction cosines of a line , whose dire...

Direction cosines of a line , whose direction ratios are `-2,1,2 ` are

A

`(-2)/3 ,1/3 ,2/3`

B

`2/3,(-1)/3,2/3`

C

`2/3,1/3,(-2)/3`

D

`2/3,1/3,4/3`

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The correct Answer is:
A
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MARVEL PUBLICATION-THREE DIMENSIONAL GEOMETRY-MULTIPLE CHOICE QUESTIONS
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  2. If a line is equally inclines to co - ordinate to co - ordinate axes ,...

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  3. Direction cosines of a line , whose direction ratios are -2,1,2 are

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  4. If P is (-1,1,2) , then direction cosines of line OP are

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  7. Given P = (3,-6,10)and PQ = sqrt(17) . If direction cosines of line PQ...

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  9. If |bar(u)| = sqrt(3) and bar(u) is equally inclined to co - ordinate...

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  10. If |bar(u)|=2 and bar(u) makes angles of 60^(@) and 120^(@) with OX a...

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  11. If a line makes angles theta(1), theta(2), theta(3) with the coordinat...

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  12. Find the angle between the lines whose direction ratios are: 2,-3,4 ...

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  13. If bar(a),bar(b),bar (c ) are pair wise mutually perpendicular vectors...

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  14. If direction ratios of two lines are 2,-6,-3 and 4,3,-1 then directi...

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  15. A line makes 45^(@) with OX and equal angles with OY and OZ .Then the ...

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  16. What is the angle between the two lines whose direction numbers are (s...

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  17. If the line of the vector bar (r ) = lambda I + 2j - k makes angles a...

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  18. The number of lines which are equally inclined to the axes is :

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  19. The projection of the line segment joining the points A(-1,0,3) and B(...

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  20. Direction Cosines of a normal to the XOY - plane are

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