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Civil Engineering Objective Questions { Elements Of Remote Sensing }

99. Pick up the correct statement from the following
A. The ratio of the up flux and down flux just above the snow surface, is called albedo
B. Spectral albedo of snow is calculated for the semi-infinite snow thickness
C. Water equivalent height of snow is the height of water column obtained by melting snow,
D. All of these

100. Fresh and pure snow reflectance
A. is very high in visible region
B. falls off steeply in the near-IR region
C. remains low for longer wave lengths
D. All of these

101. Snow albedo is affected by :
A. wave length
B. grain size
C. solar zenith angle
D. All of these

102. Which one of the following statements is correct ?
A. Snow albedo falls at all wave length with the increase of grain size
B. The effect of grain size on reflection is maximum in the near-IR region
C. The effect of grain size on reflection is low in the visible region of the spectrum
D. All of these

103. The semi-infinite snow albedo is proportional to the square root of the grain radius :
A. in the 0,2 to 0.4 gm wave length region
B. in the 0.4 to 0.8 gm wave length region
C. in the 0.8 to 1.2 gm wave length
D. None of these

104. The optical property of a water body depends on:
A. absorption by the disolved material
B. absorption by the suspended particulate matter
C. scattering by the surpended particulate matter
D. All of these

105. Phytoplanktons
A. are microscopic plants
B. are the first link in all the aquatic and marine food chains
C. convert solar energy, dissolved carbon and nitrogen into organic biomass
D. All of these

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