Yes.
False. In order for the line PQ to lie in plane B, then both P and Q must lie in plane B.
they lie in the same plane
Yes because a line can lie in many planes so one we add one point not on that line, we define a unique plane.
Yes, a plane containing 2 points of a line contains the entire line. Let us consider two points on a plane and then draw a line segment joining those two points. Since the points lie on the plane so line segment has to lie completely on that plane too. Now if we extend the line segment indefinitely in both directions we get a line and that line also has to lie on the same plane since some definite part(line segment) of it(line) also lies on the same plane.
True.
Points or lines that lie on the same plane are coplanar.
It is a Geometry Theorem. "A line and a point not on the line lie in exactly one place" means what it says.
Not necessarily. Coplanar means that points lie on the same plane whereas collinear means that points lie on the same line. Points on a plane do not necessarily lie along the same line.
Always; although that line can lie in infinitely many planes.
>> Burger vector and dislocation line both not lie in single active slip plane in sessile dislocation.
parallel