Jamaat Salaah and Imaamat

Q: I am a Sunni Muslim and we pray different to Shia Muslims.

My question is, how should I pray with jamaat when I visit Karbala. Can you please put some light on this.

Q: Can a 15 year old boy lead fardh jamaat salaah?

Q: I have a few questions;

1. I’m a student at a university in Saudi Arabia. I sometimes have lectures from 3pm- 4pm, when asr time is around 3:20pm. The Muslims around me don’t get up and perform their salah when the prayer is called, they make it up after the lecture is over. So I wanted to ask, is it permissible to not attend to salaah because you are in a lecture hall while the teacher is teaching? I was very confused because I didn’t know whether I was just being overly attentive to my salah times and stressing over how to manage my classes timings and the salaah timings, or whether it’s essential for us Muslims to attend to our salaah immediately and a lecture is no excuse.

2. Sometimes I am eating, and the azaan is called, what should I do in that case? Should I stop eating and pray, then come back and finish my food? Or should I finish my food and then go pray?

Q: I read the Q&A related to performing jamaat salaah in a hotel in Al Haram, at http://muftionline.co.za/node/13093 and http://muftionline.co.za/node/25791 and http://muftionline.co.za/node/27480

In Pakistan, many masjids have 1st floor and few have 2nd floors as well. Please enlighten me that performing jamaat salaah on 1st and 2nd floor is valid or not?

Q:

1. If I am praying behind the imam and I have a few rakats to pray, when do I stand up; after the imam's first salam or when he finishes both salams?

2. If I stand up after the first salam, is my prayer valid?

Q: Is it permissible to have 2 jamaats in the masjid for the same prayer?

Q:

1. If 2 rakaats are missed in Maghrib Salaah, would the first rakaat after the imams salaam contain tashahhud?

2. If 3 rakaats are missed in Esha Salaah, would the first rakaat or the second after the imams salaam contain tashahud? 

Q:

1. If a person joins jumuah prayer in the second rakaat after rukoo, should he complete his remaining prayer or should he perform zuhar prayer?

2. In eid prayer, in the same above mentioned condition, will his eid namaz be considered performed?

Q: There is no masjid which pray namaz as per the true Sunnah method in our area. The nearest masjid is almost 14 km away. The nearest masjid follows Hanafi Fiqh. What should I do; should I pray alone at home or I got to the Hanafi masjid and pray as per Sunnah method?

Q: What is the Islamic ruling on someone praying maghrib salaat at the back of the Imam that is praying esha salaah?