Question { Amazon, 2285 }

how sensors are working?

Answer

A sensor converts the physical action to be measured into an electrical equivalent and processes it so that the electrical signals can be easily sent and further processed. The sensor can output whether an object is present or not present (binary) or what measurement value has been reached (analog or digital).

The terms "sensor" and "transducer" have often been used as synonyms. The American National Standards Institute (ANSI) standard MC6.1 defines a transducer as "a device which provides a usable output in response to a specific measurand" (Instrument Society of America, 1975).

Question { Amazon, 3563 }

In a locked empty room from inside a man hanged himself to a fan above 10 feet and there is nothing in the room on which he could have stand and hung up but there is some water on the floor can anybody give the answee

Answer

The man committed suicide. He stood on a big ice cube and hung himself. After some time the ice melted and water puddle only present in the scene along with the hung man.
This is a stupid question, but that's what they're looking for. No one is asking where did the block of ice come from? Was all the water turned into ice when the man hang himself? If so, how did he know that he would die of hanging and not of cold? If he was force in there when the water was frozen, he would have die long before the Ice melted. Ice cubes do not stay steady and they're slippery.