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If the direction cosine of a line are < ...

If the direction cosine of a line are < k,k,k >, then,

A

kgt0

B

0ltklt1

C

k=1

D

`k=1/sqrt3 or -1/sqrt3`

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PRADEEP PUBLICATION-THREE DIMENSIONAL GEOMETRY-EXERCISE
  1. Distance of the point (alpha, beta,gamma) from y-axis is

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  2. The distance of a point P(a,b,c) from x axis is:

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  3. If the direction cosine of a line are < k,k,k >, then,

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  4. If a line makes angles alpha,beta,gamma respectively with positive dir...

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  5. Distance of the point (alpha, beta,gamma) from y-axis is

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  6. The co-ordinates of foot of the perpendicular drawn from the point (2,...

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  7. The equation of x-axis is of the form

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  8. A set of D.R of the line vecr=(hati+hatj+hatk)+1(2hati+3hatj+6hatk)are

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  9. If alpha, beta, gamma are the angles that a line makes with the positi...

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  10. P is a point on the line segment joining the points (3, 2, -1) and (6,...

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  11. The shortest destance between vecr = veca1 + lambdavecb and vecr = vec...

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  12. The area of the quadrilateral ABCD, where A 0,4, 1), B (2, 3, -1), C (...

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  13. The line x=1, y=2 is

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  14. The distance between the planes 3x+2y-6z=14=0 and 3x+2y-6z+21=0 is

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  15. The line (x-x1)/0=(y-y1)/1=(z-z1)/2 is

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  16. The line (x-x1)/0=(y-y1)/1=(z-z1)/2 is

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  17. The locus represented by x y + yz=0 is

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  18. The line (x-x1)/a=(y-y1)/b=(z-z1)/c is at right angles to the plane Ax...

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  19. The line (x-x1)/a=(y-y1)/b=(z-z1)/c is parallel to the plane Ax+By+Cz+...

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  20. The lines vecr=a1+tvecv1 and vecr=a2+svecv2 lie in a plane (vecv1xxvec...

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