The planes x=0 and y=0` (A) are parallel (B) are perpendicular to each other (C) interesect in z-axis (D) none of these

The plane x+y=0 (A) is parallel to y-axis (B) is perpendicular to z-axis (C) passes through y-axis (D) none of these

The two lines x=ay+b, z=cy+d and x=a'y+b', z=c'y+d' are perpendicular to each other, if

The planes: 2x-y+4z=5 and 5x-2.5y+10z=6 are (A) Perpendicular (B) Parallel (C) intersect y-axis (D) passes through (0,0,(5)/(4))

Two circles x^2 + y^2 + 2x-4y=0 and x^2 + y^2 - 8y - 4 = 0 (A) touch each other externally (B) intersect each other (C) touch each other internally (D) none of these

Let the equations of a line and plane be (x+3)/(2)=(y-4)/(3)=(z+5)/(2) and 4x-2y-z=1 respectively,then a.the line is parallel to the plane b.the line is perpendicular to the plane c.the line lies in the plane d.none of these

The lines (x-1)/2=(y-2)/3=(z-3)/4 and (x-1)/3=(y-2)/4=(z-3)/5 are (A) parallel to x-axis (B) skew (C) intersecting (D) none of these

The line x=1,y=2 is (A) parallel to x-axis (B) parallel to y-axis (C) parallel to z-axis (D) ies in a plane parallelto xy-plane.

The line x=x_1,y=y_1 is (A) parallel to x-axis (B) parallel to y-axis (C) parallel to z-axis (D) parallel to XOY plane