Remote Sensing MCQs | Remote Sensing Short Questions and Answers

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Questions
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

Answer: 36,000 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

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

Answer: 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

Answer: 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

Answer: Signature
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

Answer: 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

Answer: 20,200 km
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

Answer: 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

Answer: 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

Answer: 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

Answer: All of these

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