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MCQs

Total Questions : 687 | Page 3 of 69 pages
Question 21. The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called:
  1.    Reflectance
  2.    Reflectance factor
  3.    Albedo
  4.    None of these
 Discuss Question
Answer: Option C. -> Albedo
Question 22. If electric permittivity and magnetic permeability of the medium are respectively ‘ε’ and ‘μ’, then the velocity (Cm) of the electromagnetic wave in the medium is given by:
  1.    Cm = 1/εμ
  2.    Cm = 1/√8 μ
  3.    Cm = 5/√εμ
  4.    None of these
 Discuss Question
Answer: Option B. -> Cm = 1/√8 μ
Question 23. Which one of the following parameters is accurate for DGPS?
  1.    Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
  2.    Positional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station
  3.    Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
  4.    Positional accuracies ~ 5 - 10 m if rover is less than 25 km
 Discuss Question
Answer: Option A. -> Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
Question 24. Which one of the following errors is produced by platform characteristics of the sensor?
  1.    Altitude variation
  2.    Altitude
  3.    Orbit drift
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 25. The altitudinal distance of a geostationary satellite from the earth is about:
  1.    26,000 km
  2.    30,000 km
  3.    36,000 km
  4.    44,000 km
 Discuss Question
Answer: Option C. -> 36,000 km
Question 26. Which one of the following statements is correct regarding the GPS satellites?
  1.    The nominal altitude is about 20,200 km
  2.    The inclination of axis satellite is 55°
  3.    The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 27. 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
 Discuss Question
Answer: Option B. -> 230 km
Question 28. Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:
  1.    Electric waves
  2.    Sound waves
  3.    Electromagnetic waves
  4.    Wind waves
 Discuss Question
Answer: Option C. -> Electromagnetic waves
Question 29. A perfectly black body:
  1.    Is a diffuse emitter
  2.    Absorbs all the radiations of every wave lengths
  3.    Emits power of every wave length
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 30. Which one of the following parameters is considered to determine the reflectance of a vegetation canopy?
  1.    Solar zenith angle
  2.    Azimuth angle
  3.    Look angle
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these

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