Physics
The swing of a spinning cricket ball in air can be explained on the basis of

Buoyancy of air.
Turbulence caused by wind.
Bernoulli's theorem.
Sudden change in wind direction.

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short wave broadcasts are made by nearby radio stations.
Short waves are unaffected by atmospheric disturbances.
Short waves are more energetic than long waves.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

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Physics
Pressure Cooker cooks faster because

It cooks the food at low pressure
The material of the cooker is a good conductor
Boiling point decreases with rise of pressure
Higher temperature is attained for cooking

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