Basic General Knowledge
In 1943, Franklin D. Roosevelt, Winston Churchill and Joseph Stalin met at Teheran primarily

to discuss the strategy to be adopted by the Allies to invade Germany
for creating an effective instrument for maintaining international peace
to work out a common line of action against Japan
to consider a common plan of action by the Allies forces against the axis powers

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Basic General Knowledge
To produce sound it is necessary that

the source should execute longitudinal vibrations
the source may execute any type of vibrations
the source should execute transverse vibrations
the vibrations of source are not necessary

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