Answer: Arabic
The Qu'ran came down to Arab speaking people, so when they compiled it into a book, they naturally wrote it in their tongue, Arabic.
From Quiz: Islam Basics
Answer: Five
Five times a day. Once in the morning, then at lunch, then afternoon, evening, and night.
From Quiz: Do You Really Know Islam?
Answer: Jahiliyyah
This is known as the period of unbelief or ignorance.
From Quiz: Islamic Terms
Answer: Iblees
Iblees became Shaytan when he refused to obey the order to fall prostrate before Adam.
Zeit and Narr are Arabic words for "oil" and "fire". According to the Qur'an 7:12 Shaytan was created out of fire.
According to the Qur'an 18:50 Shaytan could also be called a Djinn which in essence means "somebody who remains hidden". This should not be understood however as if Shaytan were just another jinn.
Though djinns are often unreliable, there also are pious djinns.
What is essentially typical of djinns is their being able to see us without being seen by us. They remain hidden. Some of them kind of misbehave by misleading humans e.g. by mixing the true information they get by eavesdropping on the angels with untruths of their own making. Yet being mischievous is not part of their essence.
From Quiz: Truths And Untruths About Islam
Answer: Friday
Friday is the holy day of the week for Muslims, and is called Jumah. The Jumu'ah are specific prayers held every Friday after noon. During the Jumu'ah, the khutbah or sermon is delivered, which could involve preaching on particular aspects of the religion or explanations of certain texts in the Qur'an. The person delivering the sermon is called the khatib.
From Quiz: Help! I Don't Know These Islamic Terms
Answer: 50
In the Qur'an, it is said that originally Allah decided that Muslims should pray fifty times a day. But Moses told Muhammad that the people were too weak for it and he told Muhammad to ask Allah to lower the daily prayers. So Muhammad asked Allah and Allah lowered the prayer to forty. Moses said this was still too much so Muhammad asked Allah again and Allah kept lowering the prayers until it got to five. Moses thought that this number should be lowered but Muhammad was too ashamed to ask Allah again.
From Quiz: A is for Allah
Answer: 28
From Quiz: What I know about Islam and the last Prophet
Answer: Isa
Isa will arrive to defeat the Dajjal sometime during the Mahdi's lifetime. He will have three tasks when he returns: defeat the dajjal, protect the Muslims from the Gog and Magog, and rule as a caliph.
From Quiz: Islam: Day of Judgement
Answer: 40 years
Jesus will remain on this Earth for 40 years. He will get married, and have children. He will die a normal death. According to Islam, Jesus never actually died; he was merely taken by God to wait until he was needed for the Al-Qiyamah, the resurrection. Source: inter-islam.org
From Quiz: Day of Judgement
Answer: to perform the Hajj
It is required by all Muslims to perform the Hajj, or sacred pilgrimage to Mecca, unless you cannot afford the trip or are in poor health. A male Muslim has to wear an Ihram, an article of clothing made of two simple white pieces of cloth, to symbolize men are equal before their Creator, despite their worldly status. Women just have to wear modest clothing that cover their body. The Hajj is taken place from the 8 of Dhul-Hijja, the last month in the lunar Islamic calender, to the 13th. Some required activities during the Hajj are the Tawaf, the circling of the Kaaba, the holiest mosque in Islam, and the Sai, the running between the hills of Safa and Marwa seven times to imitate Hagar's hectic search for water. Muslims also partake in a day of contemplation of their lives at Mount Arafat and stone large walls representing the wicked devil. Most Muslims also choose to visit the sacred Zam-Zam well, and drink its water, and visit the Prophet's Mosque, in Medina, where he is buried.
From Quiz: Legendary "Lasts" In Islam