Civil Engineering - Elements of Remote Sensing

Exercise :: Elements of Remote Sensing - Section 3

36. 

Electromagnetic waves are characterised by :

A. frequency
B. wave length
C. intensity
D. direction of travel and plane of polarisation.
E. All of these

Answer: Option E

Explanation:

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37. 

The solid angle subtended by the sphere is :

A.
B.
C.
D.

Answer: Option C

Explanation:

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38. 

For accurate position fix, the three satellites:

A. must be along a common arc
B. must be in vertical line above the receiver
C. must be widely separated and well distributed
D. must be such that one satellite is overhead of the receiver and other two widely separated

Answer: Option C

Explanation:

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39. 

Pick up the correct statement from the following:

A. Water molecules and salt-ions in the ocean scatter the lower wave length more
B. An increase in the back scattering coefficient with shorter wave length gives a deep blue colour for clear oceanic water
C. The ratio of the upwelling irradiance just below the surface and downwelling irradiance just above the surface is called reflectance ratio.
D. All of these

Answer: Option D

Explanation:

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40. 

Pick up the correct statement from the following:

A. The wave length of gamma rays is 10-10 m
B. The wave length of radio rays is 106 m
C. The visible length occupies a small portion of the electromagntic spectrum extending roughly from 0.4 μ m to 0.7μm wave length.
D. All of these

Answer: Option D

Explanation:

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