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Free download in PDF Elements of Remote Sensing Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(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
(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
(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
(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
(30)
Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:
[A]
India
[B]
USA
[C]
European Union
[D]
Russia
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
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
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
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
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
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