Tanganyika (modern-day mainland Tanzania) was a former German colony in East Africa. Following World War I, it became a Class B mandate under the administration of Great Britain, while the smaller neighboring territories of Ruanda-Urundi were assigned to Belgium.

Class A mandates consisted of former Ottoman territories deemed nearly ready for independence. While Iraq and Palestine were assigned to Great Britain, Syria (along with Lebanon) was placed under the mandate of France. The answer 'France' specifically applies to the Syrian portion of the question.

The Permanent Mandates Commission was the body responsible for oversight of the territories taken from the defeated powers of WWI (Germany and the Ottoman Empire). It was formally constituted and held its first session in 1921 to review the administration of these mandated territories under Article 22.

The International Labour Organization (ILO) was created as an affiliated agency of the League of Nations. Its headquarters were established in Geneva, Switzerland, alongside the League of Nations, to facilitate close cooperation between the two bodies regarding international social and labor issues.

Although the statute for the Permanent Court of International Justice was approved in late 1920, the judges were elected in 1921, and the Court held its first inaugural sitting in February 1922 at the Peace Palace in The Hague.

Judges of the Permanent Court of International Justice were elected for a term of nine years. They were elected by the Council and the Assembly of the League of Nations and were eligible for re-election upon the completion of their term.

The Permanent Court of International Justice (PCIJ), established by the League, originally consisted of eleven judges and four deputy judges. However, usually, the quorum required was nine judges. Later amendments increased the number, but early structures often referenced nine active judges for proceedings.

The Secretary-General was the chief administrative officer of the League. While the specific tenure could vary in subsequent appointments or resignations, the initial understanding for the office, as seen with Sir Eric Drummond's service, was a long-term appointment, often cited as a ten-year term to ensure stability and continuity in administration.

The headquarters and the permanent Secretariat of the League of Nations were located in Geneva, Switzerland. Geneva was chosen because of Switzerland's long-standing tradition of neutrality, providing a safe and impartial venue for international diplomacy.

Germany joined the League and the Council in 1926 but withdrew in 1933 under Adolf Hitler. Japan, a founding permanent member, withdrew in 1933 (effective later) following the League's condemnation of its invasion of Manchuria. Note that the year 1931 in the question refers to the start of the Manchurian crisis which precipitated Japan's exit, although the formal withdrawal notices came in 1933.