Trying to decipher your handwriting:
Q1. Picture on right [there are six diagrams on the right, all too fuzzy to read the labels - which one?] represents diamagnetism effect when we apply a magnetic field [the 3rd and 4th from the top show a ##\vec B## ... I think] [?] shows orbiting electron around a nucleus [the 3rd and 4th ones seem to show a particle orbiting a point labelled O - the 3rd has negative spin and the 4th positive by the right-hand rule].
(a) Is it the only contribution for diamagnetism
(b) Does spin too contribute to the diamagnetism. [Is?] spin contribution less.
(c) Does both orbiting and spin contribute?
(d) What change is there in...
... I'll stop there: this looks like the sort of thing that gets set for homework.
The text you got the pictures from should explain the diagrams and the model being used. If not, then you need to find a reference which does.
There are a number of models possible depending on your education level and what you hope to achieve.