Equation of Parabola When Its Axis Is Parallel to X or Y Axis

Q. $x-3=t^2,y=4t$ are the parametric equations of the parabola

1. $y^2=16x$
2. $y^2-16x+48=0$
3. $y^2-16x-48=0$
4. $y^2-4x+16=0$

Q. $x-3=t^2,y=4t$ are the parametric equations of the parabola

1. $y^2=16x$
2. $y^2-16x+48=0$
3. $y^2-16x-48=0$
4. $y^2-4x+16=0$

Q. If tangents are drawn on any focal chord of a parabola, then choose the correct option(s)

1. both the tangents will always be perpendicular to each other
2. extremities of the focal chord and intersection point of the tangents will lie on the circles discribed on the focal chord as diameter
3. both the tangents need not be perpendicular to each other
4. tangents will intersect each other at directrix