Elements Of Remote Sensing Set 2 MCQs

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