wudhu

Q: In wudhu, masah of quarter of the head is fardh. How do you determine or how do you measure quarter of the head? Please give easy explanation in detail so that I can explain to the children?

Q:

1. Is it permissible to do tayammum for salah after having cataract surgery, the doctor has advised to avoid water?

2. What is the method of doing tayammum?

3. Is it permissible to do tayammum on a roof slate or roof tile?

Q: I wanted to know the sunnah method of khilaal of the fingers. Should one place the fingers of the left hand in the right hand only or vice-versa as well?

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: Is it permissible to touch a mus'haf without performing ablution/wudhu? Or let's say is if permissible to study qur'an without wudhu? Because I am memorizing Qur'an and I always go to the comfort room, always pee so I find it hard to make a wudhu every after entering the comfort room. It is also very cold in my country especially in morning. But if it is impermissible or not permissible then I will have no choice but to make wudhu every time after entering the comfort room.