elements-of-remote-sensing civil-engineering question and answers -Page 5

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1. Which one of the following statements is correct regarding the GPS satellites?
Options
A. The nominal altitude is about 20, 200 km
B. The inclination of axis satellite is 55�
C. The satellite transmits two L band signals (L₁ with 1575.42 MHz and L₂ with 1276.6 MHz)
D. All of these

2. Pick up the correct statement from the following:
Options
A. Permeability is a measure of conducting the magnetic lines of force in the material.
B. Permeability is a measure of the extent to which magnetic lines of force can penetrate a medium.
C. Permeability is expressed as the ratio of the magnetic flux density (B) to the field strength of the magnetizing field.
D. The force between the magnetic poles is inversely proportional to the permeability of the medium.
E. All of these

3. Due to pertubation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its
Options
A. six ground stations
B. five ground stations
C. four ground stations
D. three ground stations

4. Pick up the correct statement from the following
Options
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. A homogeneous snow pack is one whose average grain size does not vary with depth.
E. All of these

6. The coherence length over which there is a strong relationship between amplitudes is;
Options
A. directly proportional to the bandwidth
B. inversely proportional to the bandwidth
C. the square of the bandwidth
D. none of these

8. The reflection of solar energy is characterised by the water content in the leaf, in the reflective optical infrared:
Options
A. visible (0.4 - 0.7 ?m) region
B. near-IR (0.7 - 1.3 ?m) region
C. short wave-IR (1.3 - 2.7 ?m) region
D. None of these

9. Which one of the following parameters is considered to determine the reflectance of a vegetation canopy
Options
A. Solar zenith angle
B. Azimuth angle
C. Look angle
D. Number and arrangement of leaves
E. All of these

10. 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);
Options
A. the angle of incidence is equal to the angle of refraction
B. the angle of refraction (?r) is given by
C. Both (a) and (b)
D. neither (a) nor (b)

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