Hii
I am pursuing mba and I love my senior.he is also in same college.but I don't know whether he loves me or not.we talk to each other.some time I call him and some time he call me.in a week we talk 2-3 times for half an hour but sometimes it may be 10 days we didn't talked to each other.because I don't know what he feel for me and it will not look good calling him again and again.he answer my all question whatever I ask it may be related to his personal life or his close friends personal life.so how *** I know he loves me or not?

I don't know what a senior means in this context - a student teaching assistant in charge of a certain class, or a mentor for all classes? (I'm in the US.)
If something like that, and he calls you on occasion to just chat, I would say that there is a very fine line between doing his job by seeing how you are doing vs. wanting to chat to get to know you personally. You are going to have to distinguish this yourself by tiny clues.
You could ask him lightly if he gives this much attention to all his students, laugh a little, say you are honored. The question isn't whether he loves you or not, WAAAY too soon for love. The brave step to take would be to see if he would answer study questions in the cafeteria. Seeing his face and eyes will tell you much more. Say if he doesn't have time (school and work), you understand.

ERROR: You must spread some Reputation around before giving it to joypulv again.

I don't know what he is thinking, nor how old you both are, or how appropriate a romantic relationship is with your senior, but I doubt he loves you. If it is permitted find out in person if he has an interest in you by inviting him to a one on one discussion of your courses over coffee, and then work to the questions you want to ask him personally. It may not be love at this point, but you can judge is he just friendly and open, or if he is interested in knowing you better.

No high hopes though, way to early for that. Besides if he wanted more would he pursue you more? Again the question of is it appropriate. So define senior for me please.

Hey you...

Its not that hard to find out whether he loves you or not... you can know that in the way he speaks to you... the way he reacts to you when he see you...
The actual part we doesn't knew what he message you or what he speak with you...
But if he loves you he would message you daily or call you daily... he would have an interest in what you do by this time... so be calm think and analyze... wait for some days... if you like him don't try to impress him much... guys can easily find out what's going on with girls... Don't give such a chance,, you mentioned that you only question him and he answers... if he loves you he would ask you many things... so I there is only 25% chance...
Don't think much about this... chill out and surely you would knew whether he loves you in his behavior...