an event can′t be accomplished until activities leading to it are completed

no activity from any event can be started from preceding event till it is completed

length of arrow has nothing to do with time

all of the above.

a straight line

a number enclosed in a circle or a square

a straight line with circles at the ends

a dotted line

all activities should be numbered

only important activities should be numbered

only critical activities are numbered

only selected activities are numbered

ahead of schedule

beyond schedule

as per schedule

on critical path

the maximum time which an activity might require

the average time required for a job

the most probable time considering all conditions

the minimum time in which an activity can possibly be accomplished