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

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

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Basic General Knowledge
The exhaled air contains

a mixture of carbon dioxide and nitrogen
a mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage
carbon dioxide only
a mixture which has more carbon dioxide than oxygen

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Basic General Knowledge
Which are the important meeting of the Commonwealth?

Regular meeting of the minister of education, law, health and other minister
Biennial meeting of the Commonwealth Heads of Government (CHOGM)
Annual meeting of the finance minister of the member countries
All of these

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