Basic General Knowledge
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

on a cloudy night the clouds are warm and therefore retard the cooling
current of air carry the heat away from the earth on a clear night
the clear sky allows radiant energy to escape readily from the earth
the clear sky allows the cold of outer space to reach the earth

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Basic General Knowledge
Which of the following agencies related to the United Nations is concerned with promoting the growth of international trade and equilibrium in balance of payments?

United Nation Development Programme
United Nations Industrial Development Organisation
International Bank for Reconstruction and Development Organisation
International Development Association

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