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This set of Elements of Remote Sensing Multiple Choice Questions & Answers (MCQs) focuses on Elements Of Remote Sensing Set 2
Q1 | The ratio of the total solar radiant energy returned by a planetary body to the total radiant energyincident on the body, the called:
- reflectance
- reflectance factor
- albedo
- none of these
Q2 | Which one of the following statement is correct?
- radiant energy expressed in joules, is the energy associated with electromagnetic radiation
- the rate of transfer of radiant energy is called flux and is expressed in watts
- the radiant energy which falls upon a surface is termed as irradiance
- all of these
Q3 | Which one of the following parameters is accurate for DGPS?
- positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
- positional accuracies ~ 2 - 5m if rover is less than 2-5 fm from the reference station
- positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
- positional accuracies ~ 5 - 10 m if rover is less than 25 km
Q4 | Crop Acreage and Production Estimation (CAPE) was funded and taken up in 1983 by:
- usa
- european union
- russia
- india
Q5 | 'A time varying electric field produces a magnetic field.' This phenomenon is called:
- hertz\s law
- ampere maxwell\s law
- faraday\s law
Q6 | The changes in the reflectivity/emissivity with time, is called:
- spectral variation
- spatial variation
- temporal variation
- none of these
Q7 | Which one of the following statements is correct?
- snow albedo falls at all wave length with the increase of grain size
- the effect of grain size on reflection is maximum in the near-ir region
- the effect of grain size on reflection is low in the visible region of the spectrum
- all of these
Q8 | Due to perturbation of the orbit, satellite orbit parameters are frequently updated onmeasurements carried out by its
- six ground stations
- five ground stations
- four ground stations
- three ground stations
Q9 | Which one of the following helps to identify the objects on the earth surface?
- atmospheric window
- signature
- radiometric error
- none of these
Q10 | Pick up the correct statement from the following:
- phase of a wave is expressed as a fraction of a period with respect to a reference
- phase is usually specified by angular measure with one period being 360°
- the reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction
- all of these
Q11 | The reflection of solar energy is characterised by the water content in the leaf, in the reflectiveoptical infrared:
- visible (0.4 -
- near-ir (0.7 -
- short wave-ir (1.3 -
- none of these
Q12 | The interaction of the electromagnetic radiation produced with a specific wave length toilluminate a target on the terrain for studying its scattered radiance, is called:
- passive remote sensing
- active remote sensing
- neutral remote sensing
- none of these
Q13 | For interpolation of satellite data used for monitoring dynamic changes that occurs on the earthsurface, the most suitable orbit for the satellite is:
- circular orbit
- sun-synchronous orbit
- near polar orbit
- none of these
Q14 | Electromagnetic spectrum contains:
- gamma rays (wave length < 10-10 m)
- ultraviolet rays (wave length < 10-6 m)
- infrared rays (wave length < 10-4 m)
- all of these
Q15 | Which one of the following quantities forms the basis of radiometry?
- radiant energy (q)
- radiant flux ( )
- radiant intensity (i)
- all of these
Q16 | According to the Snell's law if an electromagnetic wave is incident in a medium (refractiveindex n1) on another medium (refractive index m2);
- the angle of incidence is equal to the angle of refraction
- the angle of refraction r) is given by sin i
- both (a) and (b)
- neither (a) nor (b)
Q17 | The refractive index of the ocean water:
- increases with salinity
- increases with temperature
- decreases with salinity
- decreases with temperature
Q18 | The normal altitude of GPS satellite is about
- 16,200 km
- 20,200 km
- 24,400 km
- 36,100 km
Q19 | Geodimeter is based on:
- propagation of modulated light waves
- propagation of infrared radiation
- the visible light as carrier with frequency of the order of 5 × 1014 hz
- high frequency radio waves
Q20 | The code based GPS receivers are generally used for:
- vehicle tracking
- land navigation
- trans movement
- all of these
Q21 | Pick up the correct statement from the following:
- the refractive index of a medium varies according to the wavelength of the radiation,
- the variation of the refractive index with wave length, is called dispersion,
- the splitting of colours of white light by passing through a prism is caused due to dispersion
- all of these
Q22 | While propagating through homogeneous, isotropic media,
- directions of both the fields are orthogonal
- both the fields are at right angles to the direction of propagation
- both (a) and (b)
- neither (a) nor (b)
Q23 | The arrangement of terrain features which provides attributes: the shape, size and texture ofobjects, is called:
- spectral variation
- spatial variation
- temporal variation
- none of these
Q24 | Which one of the following errors is produced by platform characteristics of the sensor?
- altitude variation
- altitude
- orbit drift
- all of these
Q25 | Leaf reflectance depends primarily on:
- the pigments
- internal cell structure
- equivalent water content
- all of these