Elements Of Remote Sensing
The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:

Sensors
None of these
Active sensors
Passive sensors

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Elements Of Remote Sensing
Pick up the correct definition from the following with response to GIS.

All of these
Common boundary between two areas of a locality is known as adjacency
The area features which are wholly contained within another area feature, is known so containment
The geometric property which describes the linkage between line features is defined as connectivity

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