Yes it is.
It is false
a vertical one
The vertical distance of a heavy projectile. Heavy so that air resistance can be ignored.
Indirectly, yes. If the graph is a straight line there is no acceleration, if the graph is not linear there is acceleration.
No. It would imply motion at infinite speed.
distance-time graph
If it is distance from a point versus time, with distance on the vertical axis and time on the horizontal axis, it would show a steep vertical climb on the graph. The steeper vertical change, the faster, but never completely vertical. Large "rise" (distance) over short "run" (time). With 0 acceleration, the graph is a straight line.
It is not possible since it would imply that the object moved some distance in no time. This would imply infinite speed which is not possible.
False
Distance and Time are variables and always moving. Therefore the answer is no. Let's suppose: If time is the vertical axis and distance (travelled) the horizontal axis. Standing still (not travelling) would show a vertical graph line. If distance is the vertical axis and time the horizontal axis. Then standing still would form a horizontal line based on time alone.
The main difference is that the vertical scale for a frequency graph is in units (or numbers) whereas in a percentage graph, it is in percentages,
Typically distance is plotted on the y-axis of a distance-time graph.