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Elements Of Remote Sensing

Elements Of Remote Sensing
The altitudinal distance of a geostationary satellite from the earth is about:

30,000 km
44,000 km
26,000 km
36,000 km

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Elements Of Remote Sensing
The maximum sun's radiation occurs around:

0.7 μ wave length
0.55 μ wave length
0.4 μm wave length
None of these

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Elements Of Remote Sensing
The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

10-10 to 1010 m
10-8 to 106 m
10-8 to 108 m
10-10 to 106 m

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Elements Of Remote Sensing
Critical angle of electromagnetic radiation takes place if

Angle of incidence is equal to angle of refraction
Angle of refraction is equal to 90°
Angle of incidence is greater than the angle of refraction
Angle of incidence is equal to 90°

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Elements Of Remote Sensing
A passive sensor uses:

Flash light as a source of energy
Its own source of energy
None of these
Sun as the source of energy

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Elements Of Remote Sensing
Pick up the important characteristic of a target which facilitates its identification from the following:

Spectral variation
All of these
Temporal variation
Spatial variation

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