Elements of Remote Sensing

11. Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:

  1. USA
  2. European Union
  3. Russia
  4. India

Correct answer: (D)
India

12. DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within

  1. 25 km
  2. 50 km
  3. 75 km
  4. 100 km

Correct answer: (D)
100 km

13. Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

  1. Six ground stations
  2. Five ground stations
  3. Four ground stations
  4. Three ground stations

Correct answer: (B)
Five ground stations

14. Due to scan geometry of a satellite sensor:

  1. The off-nadir resolution is degraded
  2. The ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir
  3. The details towards the edge of the scan get compressed
  4. All of these

Correct answer: (D)
All of these

15. Earth observations from a satellite platform provide:

  1. Synoptic view of a large area
  2. Constant solar zenith angles and similar illumination conditions
  3. Repetitive observations of the same area with intervals of a few minutes to a few weeks
  4. All of these

Correct answer: (D)
All of these

16. Electromagnetic radiation:

  1. Produces a time varying magnetic field and vice versa
  2. Once generated, remains self-propagating
  3. Is capable to travel across space
  4. All of these

Correct answer: (D)
All of these

17. Electromagnetic spectrum contains:

  1. Gamma rays (wave length < 10-10 m)
  2. Ultraviolet rays (wave length < 10-6 m)
  3. Infrared rays (wave length < 10-4 m)
  4. All of these

Correct answer: (D)
All of these

18. For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is:

  1. 130 km
  2. 230 km
  3. 250 km
  4. 500 km

Correct answer: (B)
230 km

19. For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is:

  1. Circular orbit
  2. Sun-synchronous orbit
  3. Near polar orbit
  4. None of these

Correct answer: (B)
Sun-synchronous orbit

20. Formation of snow occurs if the cloud temperature is

  1. Just above the freezing point
  2. At the freezing point
  3. Below the freezing point
  4. None of these

Correct answer: (C)
Below the freezing point

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