Elements of Remote Sensing Quiz | Elements of Remote Sensing Objective Type Questions and Answers

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Questions
21 Pick up the correct statement from the following:
A An increase of phytoplankton decreases the back scattering in the green region
B An increase of phytoplankton increases the back scattering in the green region
C Phytoplankton contains photosynthetically active pigment
D An increase of phytoplankton absorbs the bule region rapidly

Answer: An increase of phytoplankton decreases the back scattering in the green region
22 Which one of the following statements is correct?
A During the night, earth emits radiation from its surface
B During the day, earth reflects solar radiation
C During the day, earth reflects both solar radiations the emission from its surface
D All of these

Answer: All of these
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23 A reduction of nitrogen nutrient in plants:
A Increase the visible reflectivity
B Reduces pigment concentration
C Affects leaf colour
D All of these

Answer: All of these
24 Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:
A Electromagnetic waves
B Sound waves
C Electric waves
D None of these

Answer: Electromagnetic waves
25 Which one of the following statement is incorrect regarding the electromagnetic radiation?
A The changing electric fields induce the changing magnetic fields in the surrounding medium
B The oscillation of charged particles sets up changing electric fields
C These are produced by the motion of electric charge
D None of these

Answer: None of these
26 The altitudinal distance of a geostationary satellite from the earth is about:
A 36,000 km
B 30,000 km
C 26,000 km
D 44,000 km

Answer: 36,000 km
27 The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called:
A Albedo
B Reflectance
C Reflectance factor
D None of these

Answer: Albedo
28 Due to scan geometry of a satellite sensor:
A The details towards the edge of the scan get compressed
B The off-nadir resolution is degraded
C The ground distance swept by the senor, IFOV is proportional to sec2 of scan measured from the nadir
D All of these

Answer: All of these
29 Pick up the correct statement from the following:
A The relative phase difference between the waves is important and not the absolute phase of a point on the wave
B The surface defined by the locus of points having same phase, is called a wave front
C The wave whose surface of constant phase are parallel planes, is known as a plane wave
D All of these

Answer: All of these
30 Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:
A India
B USA
C European Union
D Russia

Answer: India
31 The changes in the reflectivity/emissivity with time, is called:
A Temporal variation
B Spectral variation
C Spatial variation
D None of these

Answer: Temporal variation
32 Which one of the following statements is correct?
A The effect of grain size on reflection is low in the visible region of the spectrum
B The effect of grain size on reflection is maximum in the near-IR region
C Snow albedo falls at all wave length with the increase of grain size
D All of these

Answer: All of these
33 Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its
A Five ground stations
B Six ground stations
C Three ground stations
D Four ground stations

Answer: Five ground stations
34 Which one of the following helps to identify the objects on the earth surface?
A Signature
B Radiometric error
C Atmospheric window
D None of these

Answer: Signature
35 The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:
A Active remote sensing
B Neutral remote sensing
C Passive remote sensing
D None of these

Answer: Active remote sensing
36 For interpolation of satellite data used for monitoring dynamic changes that occurs on the earth surface, the most suitable orbit for the satellite is:
A Sun-synchronous orbit
B Near polar orbit
C Circular orbit
D None of these

Answer: Sun-synchronous orbit
37 Electromagnetic spectrum contains:
A Infrared rays (wave length < 10 -4 m)
B Gamma rays (wave length < 10-10 m)
C Ultraviolet rays (wave length < 10-6 m)
D All of these

Answer: All of these
38 Which one of the following quantities forms the basis of radiometry?
A Radiant intensity (I)
B Radiant flux ( )
C Radiant energy (Q)
D All of these

Answer: All of these
39 The refractive index of the ocean water:
A Decreases with temperature
B Decreases with salinity
C Increases with temperature
D Increases with salinity

Answer: Increases with salinity
40 The normal altitude of GPS satellite is about
A 20,200 km
B 36,100 km
C 16,200 km
D 24,400 km

Answer: 20,200 km

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