Question: The Diwan of Umar, assigning annuities to all Arabs and to the Muslim soldiers of other races, underwent a change in the hands of the Umayyads. The Umayyads meddled with the register and the recipients regarded pensions as the subsistence allowance even without being in active service. Hisham reformed it and paid only to those who participated in battle. On the pattern of the Byzantine system the Umayyads reformed their army organization in general and divided it into five corps: the centre, two wings, vanguards and rearguards, following the same formation while on march or on a battle field. Marwan II (740–50) abandoned the old division and introduced Kurdus (cohort), a small compact body. The Umayyad troops were divided into three divisions: infantry, cavalry and artillery. Arab troops were dressed and armed in Greek fashion. The Umayyad cavalry used plain and round saddles. The artillery used arradah (ballista), manjaniq (the mangonel) and dabbabah or kabsh (the battering ram). The heavy engines, siege machines and baggage were carried on camels behind the army.
Is there an answer to this question: Who didn't change the Diwan of Umar?

Answer: unanswerable


Question: Football gameday traditions During home games, activities occur all around campus and different dorms decorate their halls with a traditional item (e.g. Zahm House's two-story banner). Traditional activities begin at the stroke of midnight with the Drummers' Circle. This tradition involves the drum line of the Band of the Fighting Irish and ushers in the rest of the festivities that will continue the rest of the gameday Saturday. Later that day, the trumpet section will play the Notre Dame Victory March and the Notre Dame Alma Mater under the dome. The band entire will play a concert at the steps of Bond Hall, from where they will march into Notre Dame Stadium, leading fans and students alike across campus to the game.
Is there an answer to this question: What songs does the trumpet section of the Band of the Fighting Irish play preceding home football games?

Answer: the Notre Dame Victory March and the Notre Dame Alma Mater


Question: Most types of capacitor include a dielectric spacer, which increases their capacitance. These dielectrics are most often insulators. However, low capacitance devices are available with a vacuum between their plates, which allows extremely high voltage operation and low losses. Variable capacitors with their plates open to the atmosphere were commonly used in radio tuning circuits. Later designs use polymer foil dielectric between the moving and stationary plates, with no significant air space between them.
Is there an answer to this question: What sort of capacitors have traditionally been used in radio tuning circuits?

Answer: Variable capacitors


Question: The Seven Years' War was fought between 1755 and 1764, the main conflict occurring in the seven-year period from 1756 to 1763. It involved every great power of the time except the Ottoman Empire, and affected Europe, the Americas, West Africa, India, and the Philippines. Considered a prelude to the two world wars and the greatest European war since the Thirty Years War of the 17th century, it once again split Europe into two coalitions, led by Great Britain on one side and France on the other. For the first time, aiming to curtail Britain and Prussia's ever-growing might, France formed a grand coalition of its own, which ended with failure as Britain rose as the world's predominant power, altering the European balance of power.
Is there an answer to this question: What major power of the time was not involved in The Seven Years' War?

Answer:
It involved every great power of the time except the Ottoman Empire