Civil Engineering - Elements of Remote Sensing

Exercise :: Elements of Remote Sensing - Section 3

26. 

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

Answer: Option D

Explanation:

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27. 

The maximum absorption of solar radiation due to ozone occurs at wave lengths:

A. shorter than 0.3 μm
B. shorter than 0.2 μm
C. greater than 0.3 μm
D. None of these

Answer: Option A

Explanation:

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28. 

Which one of the following statements is correct to remote sensing?

A. The basic property used to identify objects, is called signature.
B. The ratio of the reflected flux to incident flux is called reflectance which varies fron 0 to 1
C. The surface from which emergent radiance is constant in all directions is called Lambertian surface.
D. All of these.

Answer: Option D

Explanation:

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29. 

Which one of the following frequencies is a GPS ?

A. L1 with frequency 1520 MHz
B. L1 with frequency 1575.42 MHz
C. L1 with frequency 1227.6 MHz
D. L1 with frequency 1280.43 Hz

Answer: Option B

Explanation:

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30. 

Snow cover on the earth surface :

A. gives the highest reflectance in the visible spectrum
B. shows marked variation in its reflectance characteristics
C. Shows side variation in the grain size
D. All the above

Answer: Option D

Explanation:

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