Method of Salaah

What should the imaam and muqtadi say when coming up from ruku?

Q:

1. Do you have to read samiallahu liman hamidah whilst getting up from rukoo or can you say it after you stand up?

2. Will the salah be invalid or makruh if one says it after getting up?

3. When praying salah in jamat, when the imam says samiallahu liman hamidah does the muqtadi have to say it too or can he just say rabbana lakal hamd?

4. Likewise, does the imam have to say rabbana lakal hamd or does he just say samiallahu liman hamidah and stays quiet after that?

Muqtadis reciting Surah Faatihah in salaah

Q: In chapter no 7 (Surah Al-Araf) verse number 204 it is stated that "When the Qur'an is read, listen to it with attention, and hold your peace: that ye may receive Mercy". So why do people when praying Fajr, Maghrib and Isha (fardh) behind the imam (first 2 rakahs), when the imam finishes reciting surah AL-Fatiha, many people recite surah fatiha, although the imam is reciting another surah. Please do clarify this.

Dua after Durood in Salaah

Q: Is the following commonly recited dua after durood thabit?

اللهم اغفرلي و لوالدي و لأستاذي و لجميع المؤمنين و المؤمنات و المسلمين و المسلسلات برحمتك يا أرحم الراحمين

Reciting a surah or aayaat equivalent to a surah in Salaah

Q: I believe that in a book I read titled, Laws of salah, written by Muhammad Ilyas Attar Qadari Razavi (Dawat-e-Islami) it said on the hundred and fifth page these following words:-

'After you finish surah Fatihah, utter amin in a low volume and then recite either three short ayahs or one long ayah that is equivalent to three short ayahs or any surah such as surah Ikhlas.'

I had a query based on the last line of this paragraph. When it quotes, 'or any surah,' do you think that this is implying that after surah Fatihah has been recited you can recite another surah, or is it suggesting that after surah fatihah you can recite an ayah that is equivalent to another surah, or do you think that it can be referring to both?