Civil Engineering - Elements of Remote Sensing

Exercise :: Elements of Remote Sensing - Section 2

46. 

The changes in the reflectivity/emis-sivity with time, is called :

A. spectral variation
B. spatial variation
C. temporal variation
D. None of these

Answer: Option C

Explanation:

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47. 

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

A. the angle of incidence is equal to the angle of refraction
B. the angle of refraction (θr) is given by
C. Both (a) and (b)
D. neither (a) nor (b)

Answer: Option B

Explanation:

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48. 

Pick up the correct statement from the following:

A. Phytoplankton contains photosyn-thetically active pigment.
B. An increase of phytoplankton increases the back scattering in the green region
C. An increase of phytoplankton absorbs the bule region rapidly
D. An increase of phytoplankon decreases the back scattering in the green region

Answer: Option D

Explanation:

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49. 

Which one of the following factors does not affect the scale of the air photographs :

A. focal length
B. flying height
C. ground elevation
D. None of these

Answer: Option D

Explanation:

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50. 

While propagating through homogeneous, isotropic media,

A. directions of both the fields are orthogonal
B. both the fields are at right angles to the direction of propagation.
C. both (a) and (b)
D. niether (a) nor (b)

Answer: Option C

Explanation:

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