Elements Of Remote Sensing MCQ

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

  Cloud evolution

  খ

  Vegetative cover

  গ

  Snow cover

  ঘ

  All of these
• Which one of the following attributes is not associated with digital maps
  ক

  Color

  খ

  Symbology

  গ

  Legends

  ঘ

  South arrow
• The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is :
  ক

  8

  খ

  12

  গ

  16

  ঘ

  24
• Formation of snow occurs if the cloud temperature is
  ক

  Just above the freezing point

  খ

  At the freezing point

  গ

  Below the freezing point

  ঘ

  None of these
• A reduction of nitrogen nutrient in plants:
  ক

  Affects leaf color

  খ

  Reduces pigment concentration

  গ

  Increase the visible reflectivity

  ঘ

  All of these
• The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as:
  ক

  Ozone hole

  খ

  Atmospheric window

  গ

  Ozone window

  ঘ

  Black hole
• The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:
  ক

  10^-10 to 10⁶ m

  খ

  10^-8 to 10⁶ m

  গ

  10^-10 to 10¹⁰ m

  ঘ

  10^-8 to 10⁸ m
• For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is:
  ক

  Circular orbit

  খ

  Sun-synchronous orbit

  গ

  Near polar orbit

  ঘ

  None of these
• Which one of the following residual biases involves the GPS accuracy?
  ক

  Satellite dependent biases due to uncertainty in the orbital parameters of the satellite

  খ

  Receiver-dependent biases due to clock stability with line

  গ

  Signal propagation biases due to the sphere and troposphere propagation

  ঘ

  All the above
• 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
  ক

  25 km

  খ

  50 km

  গ

  75 km

  ঘ

  100 km
• A passive sensor uses:
  ক

  Sun as the source of energy

  খ

  Flash light as a source of energy

  গ

  Its own source of energy

  ঘ

  None of these
• The basic requirement of any sensor system is:
  ক

  Radiometric resolution

  খ

  Spatial resolution

  গ

  Spectral resolution

  ঘ

  All of these
• Coherence of two electromagnetic waves takes place if their phase difference is:
  ক

  Constant in time

  খ

  Constant in space

  গ

  Constant in time and space

  ঘ

  None of these
• Due to scan geometry of a satellite sensor:
  ক

  The off-nadir resolution is degraded

  খ

  The ground distance swept by the senor, IFOV is proportional to sec²θ, where θ is the angle of scan measured from the nadir

  গ

  The details towards the edge of the scan get compressed

  ঘ

  All of these
• Consider the following statements regarding the satellite imaging: <br> 1. The satellite orbit is fixed in the inertial space<br> 2. During successive across-track imaging, the earth rotates beneath the sensor<br> 3. The satellite images a skewed area<br>Which one of the following statements is/are correct?
  ক

  1, 2, 3

  খ

  1, 3

  গ

  2, 3

  ঘ

  1, 2
• Pick up the correct statement from the following
  ক

  The ratio of the up flux and down flux just above the snow surface, is called albedo

  খ

  Spectral albedo of snow is calculated for the semi-infinite snow thickness

  গ

  Water equivalent height of snow is the height of water column obtained by melting snow

  ঘ

  All of these
• The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:
  ক

  Sensors

  খ

  Passive sensors

  গ

  Active sensors

  ঘ

  None of these
• Earth observations from a satellite platform provide:
  ক

  Synoptic view of a large area

  খ

  Constant solar zenith angles and similar illumination conditions

  গ

  Repetitive observations of the same area with intervals of a few minutes to a few weeks

  ঘ

  All of these
• Electromagnetic spectrum contains:
  ক

  Gamma rays (wave length -10 m)

  খ

  Ultraviolet rays (wave length -6 m)

  গ

  Infrared rays (wave length -4 m)

  ঘ

  All of these
• Which one the following is a correct statement?
  ক

  The vertical section of the soil extending into the parent material, is called profile

  খ

  The layers of the soil parallel to the earth surface are called horizons

  গ

  The transitional layer between two adjoining horizons is called boundary

  ঘ

  All of these
• The reflection of solar energy is characterized by the water content in the leaf, in the reflective optical infrared:
  ক

  Visible (0.4 - 0.7 μm) region

  খ

  Near-IR (0.7 - 1.3 μm) region

  গ

  Short wave-IR (1.3 - 2.7 μm) region

  ঘ

  None of these
• Critical angle of electromagnetic radiation takes place if
  ক

  Angle of incidence is equal to angle of refraction

  খ

  Angle of incidence is greater than the angle of refraction

  গ

  Angle of incidence is equal to 90°

  ঘ

  Angle of refraction is equal to 90°
• The maximum sun's radiation occurs around:
  ক

  0.4 μm wave length

  খ

  0.55 μ wave length

  গ

  0.7 μ wave length

  ঘ

  None of these
• The reflectance from a surface is called specular reflection if it follows:
  ক

  Snell’s law

  খ

  Lambert

  গ

  Planktan

  ঘ

  All of these
• 'A time varying electric field produces a magnetic field.' This phenomenon is called:
  ক

  Hertz's law

  খ

  Ampere Maxwell's law

  গ

  Faraday's law

  ঘ

  Kirchoff’s law
• Pick up the important characteristic of a target which facilitates its identification from the following:
  ক

  Spectral variation

  খ

  Spatial variation

  গ

  Temporal variation

  ঘ

  All of these
• The various stages occuring in GPS system are described below: <br> 1. Generation of an output to the user<br> 2. Detection of the GPS signals<br> 3. Processing the data in the built-in-computer<br> 4. Decoding the GPS signal.<br>The correct sequence of the stages is:
  ক

  1, 2, 3, 4

  খ

  2, 3, 4, 1

  গ

  2, 4, 3, 1

  ঘ

  3, 1, 2, 4
• The object of photo-interpretation is:
  ক

  Identification

  খ

  Recognition of objects

  গ

  Judging the significance of objects

  ঘ

  All of these
• Which one of the following statements regarding remote sensing is correct?
  ক

  The interaction of the electromagnetic radiation with the target

  খ

  The emission of electromagnetic radiation from the target

  গ

  Both (A) and (B)

  ঘ

  Neither (A) nor (B)
• The code based GPS receivers are generally used for:
  ক

  Vehicle tracking

  খ

  Land navigation

  গ

  Trans movement

  ঘ

  All of these