ANSWER:

It is mandatory for the followers praying behind an Imam to recite the fateha in the silent rakahs and silent prayers, without which your prayer is invalid.

It is not mandatory to recite another surah after fateha but you would lose the reward if you didn’t recite it. What is mandatory is to recite the fateha. Besides, what will you be doing standing there and not reciting anything? 

In silent prayers, behind imam, do you recite a surah after fatiha?

Prayer | November 19, 2019 6:38 pm
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“When u hear the Adhan, repeat what the Mu’adhin says. Then ask Allah 2 exalt my mention because everyone who does so will receive in return ten rewards from Allah. Then beseech Allah to grant me Al-Wasilah…” Does this mean that we repeat the Adhan as instructed, then send blessing upon the Prophet, then say the Waseelah dua?
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I read that it is recommended that the hearer of the iqamah should repeat it after the muqim (the one who announces the iqamah), and when he says “Qad qamati-s-Salah” the hearer should respond by saying: Aqamaha-llahu wa adamaha (May Allah keep it established forever). If incorrect, please inform what is 2 be said when the Muqim announces the Iqamah and esp when he says ‘Qad Qamataissalah’.