Physics
Which of the following instrument is used to measure Soil Water Tension?

Pyrometer
Tensiometer
Psychrometer
Photometer

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

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

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Metals are good conductors of heat
Plastics have a lower density than metals
Metals have higher thermal capacity than plastics
Plastics have a higher thermal conductivity than metals

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