Remote Sening

31. Pick up the correct statement from the following:

  1. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
  2. Topological characteristics of an object are independent of scale measurement
  3. The three elements of topology are adjacency, containment, and connectivity
  4. All of these

Correct answer: (D)
All of these

32. Pick up the important characteristic of a target which facilitates its identification from the following:

  1. Spectral variation
  2. Spatial variation
  3. Temporal variation
  4. All of these

Correct answer: (D)
All of these

33. Rayleigh's criterion for a rough surface is: (where letters carry their usual meanings).

  1. h> λ/Δ cos θ
  2. h = λ/8 cos θ
  3. h> λ/8 cos θ
  4. h< λ/8 cos θ

Correct answer: (C)
h> λ/8 cos θ

34. 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

Correct answer: (C)
Electromagnetic waves

35. Repetitive observations of the same area at equal interval of time are useful to monitor the dynamic phenomena:

  1. Cloud evolution
  2. Vegetative cover
  3. Snow cover
  4. All of these

Correct answer: (D)
All of these

36. Spatial variation in horizontal and vertical directions is caused due to:

  1. Physical weathering of rocks
  2. Chemical weathering of rocks
  3. Biological weathering of rocks
  4. All of these

Correct answer: (D)
All of these

37. 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

Correct answer: (C)
36,000 km

38. The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called:

  1. Spectral variation
  2. Spatial variation
  3. Temporal variation
  4. None of these

Correct answer: (B)
Spatial variation

39. The basic requirement of any sensor system is:

  1. Radiometric resolution
  2. Spatial resolution
  3. Spectral resolution
  4. All of these

Correct answer: (D)
All of these

40. The changes in the reflectivity/emissivity with time, is called:

  1. Spectral variation
  2. Spatial variation
  3. Temporal variation
  4. None of these

Correct answer: (C)
Temporal variation

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