Qaf is one of the Muqatta'e(broken) letters and because this Surah starts with this letter, it has been named Qaf
As for Muqatta'e letters, it is said that no one exactly knows the meaning of these letters and at that time it drew the attention of the pagans so much when these verses were recited. 
There are other reasons as well
Please visit:

He had this right to gift any of his property to anyone he wanted and it doesn't matter that he himself inherited these properties and didn't acquire them through his own endeavors

The significance of marriage is to the extent that it is said that one will save half of his/her religion by getting married. It means that the potentiality of getting involved with sexual sins decreases by getting married.
As for the second part of your question, according to the popular viewpoint of Maraje' a Muslim man can marry an ahlul kitab i.e. Christian, Jew or Zoroastrian woman in temporary marriage only and not vice versa. 

The criterion for starting a fast is to avoid any invalidators of fast from the Fajr Azan till Maghrib Azan.
So as far as I understood from your question, you missed the due time so if you want to start the fast, you should not eat anything and continue till Maghrib

If there is a chance of getting involved in haraam acts, then it's haraam to be alone in these places.

No, there is no need for being in state of Wudhu for touching the screen
No difference of opinions in this regard

Being sterilized or using any other means of contraception don't have anything to do with observing Iddah period.
In fact preventing Ikhtilate Miah* is one of the reasons of putting this law and not the entire reason.
It is said that the respect of the previous marriage is among the reasons.
Unless she has reached the age of menopause, so in this case there is no need for observing Iddah period.

*It means the mixture of semens and to avoid uncertainty in whose child the foetus will be, is intended by it.