Physics
Bats can sense obstacles because they produce

Supersonic sound waves
Infrasonic sound waves
Ultrasonic sound waves
Micro sound waves

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at the top of Mt. Everest
at a place in a valley below sea level
at sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

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