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The direction cosines of any normal to t...

The direction cosines of any normal to the xy-plane are

A

1, 0, 0

B

0, 1, 0

C

0, 0, 1

D

1, 1, 0

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The correct Answer is:
C
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NIKITA PUBLICATION-THREE DIMENSIONAL GEOMETRY -MULTIPLE CHOICE QUESTIONS
  1. All point X-axis have

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  2. The pairs of rectangular co-ordinate planes have equations

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  3. The direction cosines of any normal to the xy-plane are

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  4. The direction cosines of any normal to YZ-plane are

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  5. The direction cosines of any normal to ZX-plane are

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  6. If l, m, n are the direction consines of a line, then

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  7. If p hati+q hatj+r hatk is vector along a line, then p, q, r are

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  8. The co-ordinate of the point P are (x, y, z) and the direction cosines...

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  9. Two lines (x-x(i))/(l(i))=(y-y(i))/(m(i))=(z-z(i))/(n(i)), (i=1,2) are...

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  10. If alpha,beta,gamma are the angles which a line makes with OX,OY and O...

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  11. If a line makes angles alpha,beta,gamma with co-ordinate axes, then co...

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  12. If a line makes angles (alpha)/(2), (beta)/(2), (gamma)/(2) with co-o...

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  13. Two lines with direction cosines l(1),m(1),n(1) and l(2), m(2), n(2) a...

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  14. The straight lines whose direction cosines are given by al + bm + cn =...

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

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  16. If the line passing through origin makes angles theta(1), theta(2), th...

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  17. If a variable line in two adjacent position has direction cosines l,m,...

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  18. A line makes angles alpha,beta,gammaand deltawith the diagonals of a...

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  19. Find the angle between any two diagonals of a cube.

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  20. A line makes an angle alpha, beta, gamma, delta with the four diagonal...

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