ruku

Q: While offering zuhr prayer alone, I mistakenly started to recite surah al faatihah in the rukoo. Should I have offered Sejdah sahw?

Q: I'm in a habit of reading ruba (quarter) para daily. One alima told me that if there's no ruku sign at the ruba (quarter), then I must not stop at the ruba (quarter), instead I should continue till the point where the ruku sign is. I wanted to inquire if it is so?

Q: At what stage should the Imaam commence reciting the Takbeer when going into ruku and sajdah? Should he commence as he changes posture or is it permissible for him to recite this Takbeer after going into ruku or sajdah? 

Q: Is it permissible to do nafl ruku out of salaah like we sometimes do nafl sajdah?

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?

Q: What is the status of performing salaah on a chair? If a person is unable to sit on the ground, and cannot perform the sajdahs on the ground, can he sit on a chair and perform salaah with gestures? 

Q: Mufti sahab, I joined the imam in congregation salaah while the imaam was in ruku and I didn't get time to say subhana rabbiyal azeem? Did I get that rakaat? When does a person get the rakaat?

Q: I joined the Asr salaah when the Imam was coming up from ruku in the second rakaat. While he was coming up from ruku I joined the Salaah and went into ruku by accident. At the end of the salaah, I stood up and completed two rakaats and made sajda-e-sahw. Is the Salaah valid?