Elements Of Remote Sensing
A perfectly black body:

Emits power of every wave length
All listed here
Absorbs all the radiations of every wave lengths
Is a diffuse emitter

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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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Elements Of Remote Sensing
According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on another medium (refractive index m₂);

Neither (A) nor (B)
The angle of incidence is equal to the angle of refraction
Both (A) and (B)
The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi

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