Problem: On March 10, 1876, three days after his patent was issued, Bell succeeded in getting his telephone to work, using a liquid transmitter similar to Gray's design. Vibration of the diaphragm caused a needle to vibrate in the water, varying the electrical resistance in the circuit. When Bell spoke the famous sentence "Mr. WatsonCome hereI want to see you" into the liquid transmitter, Watson, listening at the receiving end in an adjoining room, heard the words clearly.
What did the vibrations cause to change?
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Answer: electrical resistance

Problem: The Riigikogu elects and appoints several high officials of the state, including the President of the Republic. In addition to that, the Riigikogu appoints, on the proposal of the President of Estonia, the Chairman of the National Court, the chairman of the board of the Bank of Estonia, the Auditor General, the Legal Chancellor and the Commander-in-Chief of the Defence Forces. A member of the Riigikogu has the right to demand explanations from the Government of the Republic and its members. This enables the members of the parliament to observe the activities of the executive power and the above-mentioned high officials of the state.
What can the Riigikogu monitor for abuse of influence?
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Answer: activities of the executive power

Problem: The Prussian army was controlled by the General Staff, under Field Marshal Helmuth von Moltke. The Prussian army was unique in Europe for having the only such organisation in existence, whose purpose in peacetime was to prepare the overall war strategy, and in wartime to direct operational movement and organise logistics and communications. The officers of the General Staff were hand-picked from the Prussian Kriegsakademie (War Academy). Moltke embraced new technology, particularly the railroad and telegraph, to coordinate and accelerate mobilisation of large forces.
The officers of the General Staff were hand-selected from which place?
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Answer:
Prussian Kriegsakademie (War Academy)