Basic General Knowledge
Super conductivity is a phenomenon in which the resistance of a substance

does not change with temperature
decreases with temperature
becomes zero at very low temperature
increases with temperature

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Basic General Knowledge
The main objectives of the UN are

to develop friendly relations among nations
All of these
to maintain peace and security in the world
to work together to remove poverty, disease and illiteracy and encourage respect for each other's rights of basic freedom.

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