Parallel
Intersecting
Skew
Coincident
A point (x.y.z) moves parallel to XY plane Which of three variables x,y,z remain fixed
z
x
y
x and y
The equation of a plane which cuts equal intercepts of unit length on the axes ,is
x+y+z = 0
x+y+z = 1
x+y-z = 0
x/a + y/a + z/a = 1
The angle between the planes 2x - y + z =6 and x + y + 2z = 7 is
π
2π/3
π/2
π/3
If the direction ratios of a line are 1,-3,2 ;then its direction cosines are
1/√14 , -3/√14 ,2/√14
1/√14 , 2/√14 , 3/√14
-1/√14 , 3/√14 , -2/√14
-1/√14 , -2/√14 , -3/√14
00
300
450
900
If α ,β, γ are the angles which a half ray makes with the positive directions of the axes , then
sin2α + sin2β + sin2γ =
1
2
-1
0
The cosine of the angle between any two diagonals of a cube
1/3
1/2
2/3
1/√3
The direction cosines of any normal to the XY-plane are
(1,0,0)
(0,1,0)
(1,1,0)
(0,0,1)
-13/4
-17/4
4
None of these
