Does taking Covid-19 test during day time of Ramadan render one`s fast invalid?

Does eating, or drinking while the Mo`azn says (Allah Akbbar) at the beginning of the second call for dawn prayer nullify fasting ?

What is the ruling on masturbating during the day of Ramadan? Is it considered one of the matters that invalidates a person’s fasting? And what is due on one who does that?

I used to taste food while observing fast, but after a while I got to know that it wasn`t permissible. What am I liable for?

What is the ruling when a person swallows his/her mucus while fasting in Ramadan?

My husband wanted to have sexual intercourse with me during the daytime in Ramadan, but I objected to that. However, he engaged in foreplay with me but without insertion. What am I liable for?

Do nicotine patches applied to the skin in Ramadan invalidate fast if they were used to help the person quit smoking, or even to continue fast?

A person was observing supererogatory fast and forgetfully slept with his wife, but she didn`t know that he was fasting. Should he continue his fast or is it considered broken?

While observing fast in Ramadan, I realized that I didn`t become free of menses because I quickly made Ghusl (Ritual bath) before making sure that it has ended. As a result, I estimated the number of these days as I thought most probable and made up for them on the basis that I have my menses in Ramadan for one time, but I don`t remember if I had experienced it twice or not in that same month?