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If the line vec(OR) makes angles theta(...

If the line `vec(OR)` makes angles ` theta_(1),theta_(2),theta_(3)` with the planes ` XOY, YOZ, ZOX` respectively , then ` cos^(2)theta_(1)+cos^(2)theta_(2)+cos^(2)theta_(3)` is equal to

A

`-1`

B

0

C

1

D

2

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The correct Answer is:
d
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MARVEL PUBLICATION-THREE DIMENSIONAL GEOMETRY-MULTIPLE CHOICE QUESTIONS
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  2. What is the angle between the two lines whose direction numbers are (s...

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

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

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

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

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  7. If the direction cosines of a line are 1/c,1/c,1/c rthen (A) c.0 (B) 0...

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  8. A mirror and a source of light are situated at the origin O and at a...

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  9. The direction Cosines of two lines at right angles are l(1),m(1),n(1)a...

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  10. The graph of the equation x^2+y^2=0 in the three dimensional space is ...

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  11. If the line OP of length r makes an angle alpha with the X - axis , an...

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  12. l = m = n = 1 are the direction Cosines of

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  13. STATEMENT-1 : The direction ratios of a line joining the points (0, 0,...

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  14. Co - ordinates of the foot of the perpendicular from the point (a,b,c)...

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  15. In three dimensional space , the equation xy = 0 represents

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  16. In space , the equation 3x-4y=0 represents

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  17. A line lies in ZX plane and makes 60^(@) with x - axis ,then direction...

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  18. The ratio in which XOZ plane divides A(2,-3,1) and B(-1,4,5) is :

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  19. If the line vec(OR) makes angles theta(1),theta(2),theta(3) with the ...

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  20. The direction ratios of a line which is perpendicular to the two vect...

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