No.
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any isosceles triangle
Not always because the diagonals of a rectangle bisect each other but they are not perpendicular to each other.
True, because the slant height and the altitude, or height, of the pyramid form one leg and the hypotenuse of a triangle withing the pyramid, and the hypotenuse of a triangle is always the longest side- it is not possible for the hypotenuse to be equal to the legs of a right triangle. (It is a right triangle because an altitude is perpendicular to the base of a pyramid.)
The angle bisectors always intersect inside the triangle. (This is not true for altitudes and right bisectors.)
The perpendicular bisectors only intersect on the triangle when it is an isosceles right triangle.