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Free download in PDF Remote Sensing Short 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.
41
The altitudinal distance of a geostationary satellite from the earth is about:
[A]
26,000 km
[B]
30,000 km
[C]
36,000 km
[D]
44,000 km
42
Pick up the correct statement from the following:
[A]
The surface defined by the locus of points having same phase, is called a wave front
[B]
The wave whose surface of constant phase are parallel planes, is known as a plane wave
[C]
The relative phase difference between the waves is important and not the absolute phase of a point on the wave
[D]
All of these
43
Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:
[A]
USA
[B]
European Union
[C]
Russia
[D]
India
44
The changes in the reflectivity/emissivity with time, is called:
[A]
Spectral variation
[B]
Spatial variation
[C]
Temporal variation
[D]
None of these
Answer: Temporal variation
45
Which one of the following statements is correct?
[A]
Snow albedo falls at all wave length with the increase of grain size
[B]
The effect of grain size on reflection is maximum in the near-IR region
[C]
The effect of grain size on reflection is low in the visible region of the spectrum
[D]
All of these
46
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its
[A]
Six ground stations
[B]
Five ground stations
[C]
Four ground stations
[D]
Three ground stations
Answer: Five ground stations
47
Which one of the following helps to identify the objects on the earth surface?
[A]
Atmospheric window
[B]
Signature
[C]
Radiometric error
[D]
All of these
48
The reflection of solar energy is characterised by the water content in the leaf, in the reflective optical infrared:
[A]
Visible (0.4 –
[B]
Near-IR (0.7 –
[C]
Short wave-IR (1.3 –
[D]
None of these
Answer: Short wave-IR (1.3 –
49
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]
Passive remote sensing
[B]
Active remote sensing
[C]
Neutral remote sensing
[D]
All of these
Answer: Active remote sensing
50
Which one of the following quantities forms the basis of radiometry?
[A]
Radiant energy (Q)
[B]
Radiant flux
[C]
Radiant intensity (I)
[D]
All of these
51
The refractive index of the ocean water:
[A]
Increases with salinity
[B]
Increases with temperature
[C]
Decreases with salinity
[D]
Decreases with temperature
Answer: Increases with salinity
52
The normal altitude of GPS satellite is about
[A]
16,200 km
[B]
20,200 km
[C]
24,400 km
[D]
None of these
53
Geodimeter is based on:
[A]
Propagation of modulated light waves
[B]
Propagation of infrared radiation
[C]
The visible light as carrier with frequency of the order of 5 × 1014 Hz
[D]
High frequency radio waves
Answer: Propagation of modulated light waves
54
The code based GPS receivers are generally used for:
[A]
Vehicle tracking
[B]
Land navigation
[C]
Trans movement
[D]
All of these
55
Pick up the correct statement from the following:
[A]
The refractive index of a medium varies according to the wavelength of the radiation
[B]
The variation of the refractive index with wave length, is called dispersion
[C]
The splitting of colours of white light by passing through a prism is caused due to dispersion
[D]
All of these
56
The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called:
[A]
Spectral variation
[B]
Spatial variation
[C]
Temporal variation
[D]
All of these
Answer: Spatial variation
57
Pick up the correct statement from the following:
[A]
Phytoplankton contains photosynthetically active pigment
[B]
An increase of phytoplankton increases the back scattering in the green region
[C]
An increase of phytoplankton absorbs the bule region rapidly
[D]
An increase of phytoplankton decreases the back scattering in the green region
Answer: An increase of phytoplankton decreases the back scattering in the green region
58
Pick up the correct statement from the following:
[A]
When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed
[B]
When the electric vector is in the plane of incidence, vertical polarisation is formed
[C]
When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed
[D]
All of these
59
Critical angle of electromagnetic radiation takes place if
[A]
Angle of incidence is equal to angle of refraction
[B]
Angle of incidence is greater than the angle of refraction
[C]
Angle of incidence is equal to 90°
[D]
Angle of refraction is equal to 90°
Answer: Angle of refraction is equal to 90°
60
Earth observations from a satellite platform provide:
[A]
Synoptic view of a large area
[B]
Constant solar zenith angles and similar illumination conditions
[C]
Repetitive observations of the same area with intervals of a few minutes to a few weeks
[D]
All of these
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