Factors that break wudhu

Q: What is actually urine exiting, whether it should exit the tip of the private part or I can say as urine exited by just seeing some drop of urine within inside outer most tip of private part but not came out fully.

Q: In the English Behishti Zewar, it is written that "Similarly, if there is pain in the eyes and they are sore, and in addition to this they water or tears come out, then too wudhu will break (as in the case of pink eyes). But if there is no pain in the eyes nor are they sore, then wudhu will not break by the mere flowing of tears." Does this mean that the wudhu breaks when we slice onions?

Q: If one breaks wind during performance of wudhu , what would be its effect on wudhu?

Q: If the blood does not flow beyond the wound but if I touch the blood with my finger and the blood is on my finger. Does my wudhu break?

Q: If one tries to control his fart and no feeling of gas being passed is felt but is relieved of the feeling for sometime. Will he consider his wudhu to be broken?

Q: When I pee, after I rub or press my penis on to the toilet seat there is a light and/or heavy (sometimes) string of fluid I believe, does this break wudhu? Plus how to prevent it? What is it?

Q: A mufti recently said wadi breaks whudu which breaks Salaah. I didn't know this before and I performed Salaah in this state. So due to the fact I did not know, I won't have to redo the Salaah? Plus I forgot which Salaah it was.

Q: Does the wudhu of a diabetic break if he/she swabs the injection site (e.g abdomen, side of upper arm, front of thigh) with an alcohol pad and await awhile for it to dry prior to injecting himself/herself with insulin?

Q: Does wadi break wudhu?

Q: Does touching one's private part break one's whudhu even if it maybe a necessity?