Problem: A treaty is null and void if it is in violation of a peremptory norm. These norms, unlike other principles of customary law, are recognized as permitting no violations and so cannot be altered through treaty obligations. These are limited to such universally accepted prohibitions as those against the aggressive use of force, genocide and other crimes against humanity, piracy, hostilities directed at civilian population, racial discrimination and apartheid, slavery and torture, meaning that no state can legally assume an obligation to commit or permit such acts.
What will a treaty be if it is in violation of a peremptory norm?
The answer is the following: null and void

Problem: Late in the 19th century, Paris hosted two major international expositions: the 1889 Universal Exposition, was held to mark the centennial of the French Revolution and featured the new Eiffel Tower; and the 1900 Universal Exposition, which gave Paris the Pont Alexandre III, the Grand Palais, the Petit Palais and the first Paris Métro line. Paris became the laboratory of Naturalism (Émile Zola) and Symbolism (Charles Baudelaire and Paul Verlaine), and of Impressionism in art (Courbet, Manet, Monet, Renoir.)
What type of art did Courbet, Manet, Monet and Renoir create?
The answer is the following: Impressionism

Problem: In 1941, Nasser was posted to Khartoum, Sudan, which was part of Egypt at the time. Nasser returned to Sudan in September 1942 after a brief stay in Egypt, then secured a position as an instructor in the Cairo Royal Military Academy in May 1943. In 1942, the British Ambassador Miles Lampson marched into King Farouk's palace and ordered him to dismiss Prime Minister Hussein Sirri Pasha for having pro-Axis sympathies. Nasser saw the incident as a blatant violation of Egyptian sovereignty and wrote, "I am ashamed that our army has not reacted against this attack", and wished for "calamity" to overtake the British. Nasser was accepted into the General Staff College later that year. He began to form a group of young military officers with strong nationalist sentiments who supported some form of revolution. Nasser stayed in touch with the group's members primarily through Amer, who continued to seek out interested officers within the Egyptian Armed Force's various branches and presented Nasser with a complete file on each of them.
In what year was Nasser posted to Sudan?
The answer is the following: 1941

Problem: Ibn Sīnā wrote extensively on early Islamic philosophy, especially the subjects logic, ethics, and metaphysics, including treatises named Logic and Metaphysics. Most of his works were written in Arabic – then the language of science in the Middle East – and some in Persian. Of linguistic significance even to this day are a few books that he wrote in nearly pure Persian language (particularly the Danishnamah-yi 'Ala', Philosophy for Ala' ad-Dawla'). Ibn Sīnā's commentaries on Aristotle often criticized the philosopher,[citation needed] encouraging a lively debate in the spirit of ijtihad.
What is one subject that Ibn SIna specialized in?
The answer is the following:
ethics