Qur'an

Q: If a person who is looking to become a hafiz and memorizes a surah and completed it but with a few mistakes, is he allowed to progress to the following surah? 

Q: I am a Muslim. One night a thought strikes my mind that "may be after the scientists have discovered some particular thing then the arabs have added those discoveries in the Quran by replacing the previous ayats.

Please try to understand that I am not saying that the Quran is written by humans, rather my question is that may be they have done some mixing by adding the scientific ayats and saying that it is already written in the Quran.

For example in surah "Al ambiya" it says that the heavens and the earths were joined together and we cleft it asunder". My question is that in Surah al Ambiya may be after the big bang theory was discovered the arabs added this verses in the surah al anbiya about the big bang theory?

My question is that was there such adding if scientific ayats in the Quran by the arabs or the Muslims and I am not saying that the Quran is written by humans but my question is that was there any addition of scientific verses in the Quran by the arabs secretly? 

Q:

1. What is the meaning of the 3rd ayat of Surah Noor about the fornicator males are for the fornicator females?

2. I have come across that if a wife quarrels with her husband then her husbands hoors curse his wife. Is it true? What happens when it is his fault and he does wrong to the wife?

Q:

1. Zaid recited a sajdah verse in salah, he didn't do sajdah tilaawat straight away but did sajdah tilaawat after reciting a few verses. Is the sajda tilaawat valid?

2. Zaid recited a sajdah verse in salah, he didn't do sajdah tilaawat straight away but did sajdah tilaawat in the second rakaat, is the sajda tilaawat valid? 

Q: I am a Muslim and I was reading the Quran and a thought struck my mind that "Maybe after scientists discovered a particular thing, then the Muslims or the Arabs wrote about it in the Quran and said to the world that it is already written in the Quran about 1400 years ago. Take embryology for example, maybe the Arabs were advanced in embryology and discovered things about the embryo and wrote it in the Quran or an=bout astronomy". Please help give a logical answer.

Q: In the Quran Paak 15:26 man created from mud (I translated in my own words please check reference) while 21:30 every living thing is created from water (again my own words please check reference). Please tell about these two verses and also, jinat and angels are created from fire and noor? 

Q: I have memorized 10 paras so far and my tajweed and recitation is not very good. Is it advisable for me to continue or stop with my hifz?

Q: Can you please tell me if these are Quranic Ayahs or not.

1. اذا رأيت من غيرك خلقاً ذميماً فتجنب من نفسك أمثاله

2. أبشروا باليسر يا أهل العسر؛ فوالله لن يغلب عسر يسرين 

3. اذا رأيت أخاك مكروباً فقل له ؛ أبشر الفرج قريب وإذا رأيته في عسرة فقل له؛ أبشر اليسر قريب

4. فالكم بشرى تسر قلوبكم

Q: Are the following wordings from the Qur'an Shareef and/or Ahadeeth Shareef?

1. "Hasbiyallaahu fid-deen; Hasbiyallaahu fid-dunya; Hasbiyallaahu laa ilaaha illa huwa 'alayhi tawakkaltu wa huwa Rabbul 'Arshil 'Azeem."

2. "Sitrul 'arshi masbuulun 'alayna, wa 'ainullahi naazhiratun ilayna, bi hawlillahi la yuqdiru 'alayna"

3. "Unsurnaa fi-innaka khayrun-naasireen. Waf-tah lanaa fi-innaka khayrul faatiheen. Wagh-fir lanaa fi-innaka khayrul ghaafireen. War-hamnaa fi-innaka khayrurraahimeen. War-zuqnaa fi-innaka khayrur-raaziqeen."

Q: In the masjid where I learn tajweed of Quran, it is a common practice that the one entering the masjid says salaam and does musaafaha with everyone present there, even if the person is busy in recitation of Quran. Should the person reciting the Holy Quran answer to his salam and do musaafaha with him?