Question

Passive and omnidirectional sensor is
a. Temperature
b. Water-level
c. Soil moisture
d. All of the above

Answer 1

All of the natural phenomena, like, temperature, water level, soil, the moisture of the soil are checked and sensed by the passive sensors.

Passive sensors are different from active ones as they do not take in wavelengths as sensors, but takes into account the vibrations, movements and ripples of the physical natural phenomena.

Answer 2

‘Passive and omnidirectional sensor’ is helpful in ‘Temperature, Water-level, Soil moisture’  

Option (d)

Explanation:

• Passive sensors 'sense' the data without ‘manipulating the environment’ by active probing. The ‘Passive and omnidirectional sensor’ is the ‘image sensor’ that can observe ‘360-degree’ at a time.
• The surrounding scenery is reflected in the ‘omnidirectional mirror’, and it takes a ‘picture of the image with the camera upward installed’.  
• ‘Omnidirectional sensors’ have no ‘notion of direction’ involved in their measurements. The ‘passive and omnidirectional sensor’ is helpful in ‘Temperature, Water-level, and Soil moisture’.

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