এলিমেন্ট অফ রিমোট সেন্সিং

  • ০০। "All bodies at temperatures above absolute zero degree emit electromagnetic radiation at different wave length", is known as:
    • ক) Plank‘s law
    • খ) Planktan‘s law
    • গ) Lambert‘s cosine law
    • ঘ) None of these
  • ০১। "An Electromagnetic wave falls on to a boundary between two loss less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as :
    • ক) Fresnel reflection
    • খ) Fresnel refraction
    • গ) Snell‘s law
    • ঘ) None of these
  • ০২। A and B are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?
    • ক) Height displacement of A will be less than that of B
    • খ) Height displacement of B will be less than that of A
    • গ) Height displacement of A and B is equal
    • ঘ) Height displacement of A and B will be towards each other
  • ০৩। 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
  • ০৪। A perfectly black body :
    • ক) is a diffuse emitter
    • খ) absorbs all the radiations of every wave lengths
    • গ) emits power of every wave length
    • ঘ) All the above
  • ০৫। A reduction of nitrogen nutrient in plants :
    • ক) affects leaf colour
    • খ) reduces pigment concentration
    • গ) increase the visible reflectivity
    • ঘ) All of these
  • ০৬। A remote sensor photographic camera :
    • ক) responses spectrum up to about 0.9 μ
    • খ) does not cover short wave IR region
    • গ) does not cover thermal IR region
    • ঘ) All the above
  • ০৭। According to the Snell‘s law if an electromagnetic wave is incident in a medium (refractive index n1) on an other medium (refractive index m2);
    • ক) the angle of incidence is equal to the angle of refraction
    • খ) the angle of refraction (θr) is given by
    • গ) Both (a) and (b)
    • ঘ) neither (a) nor (b)
  • ০৮। Assuming n as the frequency of radiation, n0 as the threshold frequency and k as a constant, the energy of the photo-electrons (E) is related as
    • ক) E = k (n - n0)
    • খ) E = k (n + n0)
    • গ) E = k (n x n0)
    • ঘ)
  • ০৯। 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
  • ১০। Consider the following statements regarding the satellite imaging : 1. The satellite orbit is fixed in the inertial space 2. During successive across-track imaging, the earth rotates beneath the sensor 3. The satellite images a skewed area Which one of the following statements is/are correct?
    • ক) 1, 2, 3
    • খ) 1, 3
    • গ) 2, 3
    • ঘ) 1, 2
  • ১১। 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°
  • ১২। Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:
    • ক) USA
    • খ) European Union
    • গ) Russia
    • ঘ) India
  • ১৩। Depending upon the nature of the targeted object and the wave length of the electromagnetic radiation incident on it, the radiation gets :
    • ক) reflected
    • খ) absorbed
    • গ) re-radiated
    • ঘ) transmitted through
    • ঙ) All of these
  • ১৪। DGPS is based on the concept that bais 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
    • ঙ) 1250 km
  • ১৫। Due to pertubation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its
    • ক) six ground stations
    • খ) five ground stations
    • গ) four ground stations
    • ঘ) three ground stations
  • ১৬। Due to scan geometery 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
  • ১৭। Earth observations from a satellite platform provides :
    • 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
  • ১৮। Electromagnetic radiation :
    • ক) produces a time varying magnetic field and vice versa
    • খ) once generated, remains self-propagat-ing.
    • গ) is capable to travel across space
    • ঘ) consists of magnetic and electric fields
    • ঙ) All of these
  • ১৯। Electromagnetic spectrum contains :
    • ক) gamma rays (wave length < 10-10 m)
    • খ) ultraviolet rays (wave length < 10-6 m)
    • গ) infrared rays (wave length < 10-4 m)
    • ঘ) radio rays (wave length > 1 m)
    • ঙ) All of these
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