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
Passive sensors
None of these
Active sensors

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Elements Of Remote Sensing
Geodimeter is based on:

Propagation of infrared radiation
High frequency radio waves
The visible light as carrier with frequency of the order of 5 × 1014 Hz
Propagation of modulated light waves

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

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

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