The equation of y-axis are (A) `x=0,y=0` (B) `x=0,z=0` (C) `y=0,z=0` (D) none of these

for every point (x,y,z) on the y-axis: (A) x=0,y=0 (B) x=0,z=0 (C) y=0,z=0 (D) y!=0,x=0,z=0

The equation vecr=lamda hati+muhatj represents the plane (A) x=0 (B) z=0 (C) y=0 (D) none of these

The equation of the righat bisector plane of the segment joining (2,3,4) and (6,7,8) is (A) x+y+z+15=0 (B) x+y+z-15=0 (C) x-y+z-15=0 (D) none of these

The equation of the parallel plane lying midway between the parallel planes 2x-3y+6z-7=0 and 2x-3y+6z+7=0 is (A) 2x-3y+6z+1=0 (B) 2x-3y+6z-1=0 (C) 2x-3y+6z=0 (D) none of these

The equation of the plane through the point of intersection of plane x+2y+3z=4 and 2x+y-z-5 and perpendicular to the plane 5x+3y+6z+8=0 is (A) 7x-2y+3z+81=0 (B) 23x+14y-9z+48=0 (C) 51x+15y+50z+173=0 (D) none of these

The image of plane 2x-y+z=2 in the plane mirror x+2y-z=3 is (a) x+7y-4x+5=0 (b) 3x+4y-5z+9=0 (c) 7x-y+2z-9=0 (d) None of these

What is the locus of a point for which (i) x =0, y =0 (ii) y =0, z =0 (iii) z =0, x =0 (iv) x =a, y =b (v) y =b, z =0 (vi) z =c, x =a ?

What is the jocus of a point a point for which (i) x =0, y =0 (ii) y =0 , z =0 (iii) z =0, x =0 (iv) x =a, y =a (v) y =b, z =c (vi) z =c, x =a ?

If A=[(5,x),( y,0)] and A=A^T , then a) x=0,\ \ y=5 (b) x+y=5 (c) x=y (d) none of these

The equation to the normal to the curve y=sinx at (0,\ 0) is (a) x=0 (b) y=0 (c) x+y=0 (d) x-y=0