Elements of Remote Sensing problems
- 1. In sun light, water rich in phytoplanktons appears :
Options- A. red
- B. green
- C. brown
- D. blue Discuss
Correct Answer: green
- 2. Pick up the correct statement from the following:
Options- 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 Discuss
Correct Answer: All of these
- 3. The semi-infinite snow albedo is proportional to the square root of the grain radius :
Options- A. in the 0.2 to 0.4 ?m wave length region
- B. in the 0.4 to 0.8 ?m wave length region
- C. in the 0.8 to 1.2 ?m wave length
- D. None of these Discuss
Correct Answer: in the 0.4 to 0.8 ?m wave length region
- 4. For perfect coherent radiation, which one of the following statement is correct?
Options- A. Both the waves must have single frequencies
- B. The directions of motion of both waves are parallel.
- C. The waves must be collimated
- D. All of these Discuss
Correct Answer: All of these
- 5. Snow albedo is affected by :
Options- A. wave length
- B. grain size
- C. solar zenith angle
- D. snow pack thickness
- E. All of these Discuss
Correct Answer: All of these
- 6. The energy transported by the electromagnetic wave is proportional to :
Options- A. the altitude of the wave
- B. the square of the altitude of the wave
- C. the cube of the altitude of the wave
- D. the square roof of the amplitude Discuss
Correct Answer: the square of the altitude of the wave
- 7. Pick up the correct statement from the following:
Options- 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 ? m to 0.7?m wave length.
- D. All of these Discuss
Correct Answer: All of these
- 8. Which one of the following is incorrect statement? While passing through the atmosphere, the solar radiation,
Options- A. remains unaffected
- B. gets scattered
- C. gets absorbed partially
- D. None of these Discuss
Correct Answer: remains unaffected
- 9. Which one of the following statements is correct?
Options- A. The ratio of the permitivity of a medium and the free space, is called relative permitivity.
- B. Dielectric constant is a pure number and has no dimensions.
- C. The dielectric constant of pure water is 80.
- D. Higher the dielectric constant of a medium, the poorer is its electric conductivity.
- E. All of these Discuss
Correct Answer: All of these
- 10. Which one of the following statements is correct to remote sensing?
Options- 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. Discuss
Correct Answer: All of these.
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