Basic General Knowledge
The term hit wicket in cricket refers to

when the bowler bowls out three batsman with three successive balls
None of these
when the batsman intercepts the ball with his leg or any part of his body between the wicket
when the batsman, while hitting the ball, strikes his own wicket with his bat or body and is declared out

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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

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
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

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