Elements Of Remote Sensing Set 1 MCQs

Q1 | Pick up the correct statement from the following:

topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system

topological characteristics of an object are independent of scale measurement

the three elements of topology are adjacency, containment, and connectivity

all of these

Q2 | Pick up the correct statement from the following:

in remote sensing technique, the observation place, is called a platform

platforms may be either stationary or mobile

spatial resolution of the imaging system becomes poorer with increase of platform height

all of these

Q3 | Formation of snow occurs if the cloud temperature is

just above the freezing point

at the freezing point

below the freezing point

none of these

Q4 | In the given figure the phase of

crest a

b

trough c is 3

all of these

Q5 | Coherence of two electromagnetic waves takes place if their phase difference is:

constant in time

constant in space

constant in time and space

none of these

Q6 | The coherence length over which there is a strong relationship between amplitudes is;

directly proportional to the bandwidth

inversely proportional to the bandwidth

the square of the bandwidth

none of these

Q7 | Pick up the correct statement from the following:

a graphical representation of spectral reflectance verses the various growth stages of a crop, depicts a phonologic pattern

the changes in the polarisation of the radiation reflected or emitted by an object, is known as polarisation variation

the degree of polarisation is a characteristic of the object which helps in the identification of the object

all of these

Q8 | Repetitive observations of the same area at equal interval of time are useful to monitor thedynamic phenomena:

cloud evolution

vegetative cover

snow cover

all of these

Q9 | Which one of the following parameters is considered to determine the reflectance of a vegetationcanopy?

solar zenith angle

azimuth angle

look angle

all of these

Q10 | A perfectly black body:

is a diffuse emitter

absorbs all the radiations of every wave lengths

emits power of every wave length

all the above

Q11 | sensor IFOV isproportional to:

sin2

cos2

sec2

tan2

Q12 | Which one the following is a correct statement?

the vertical section of the soil extending into the parent material, is called profile

the layers of the soil parallel to the earth surface are called horizons

the transitional layer between two adjoining horizons is called boundary

all of these

Q13 | In case of reflection and refraction of electromagnetic radiation,

angle of incidence = angle of refraction

angle of incidence = angle of reflection

angle of refraction = sum of the angles of incidence and refraction

all the above

Q14 | Which one of the following factors does not affect the scale of the air photographs?

focal length

flying height

ground elevation

none of these

Q15 | Which one of the following statements regarding remote sensing is correct?

the interaction of the electromagnetic radiation with the target

the emission of electromagnetic radiation from the target

both (a) and (b)

neither (a) nor (b)

Q16 | The optical property of a water body depends on:

absorption by the dissolved material

absorption by the suspended particulate matter

scattering by the suspended particulate matter

all of these

Q17 | Pick up the correct statement from the following:

frequency is the number of wave crests passing a fixed point in one second

frequency of a wave is measured in hertz (hz)

amplitude of a wave is the height of its crust from the mid-point

all of these

Q18 | The object of photo-interpretation is:

identification

recognition of objects

judging the significance of objects

all of these

Q19 | Pick up the correct statement from the following:

phytoplankton contains photosynthetically active pigment

an increase of phytoplankton increases the back scattering in the green region

an increase of phytoplankton absorbs the bule region rapidly

an increase of phytoplankton decreases the back scattering in the green region

Q20 | Which one of the following statements is correct regarding the GPS satellites?

the nominal altitude is about 20,200 km

the inclination of axis satellite is 55°

the satellite transmits two l band signals (l1 with 1575.42 mhz and l2 with 1276.6 mhz)

all of these

Q21 | Which one of the following statements is correct?

during the day, earth reflects solar radiation

during the day, earth reflects both solar radiations the emission from its surface

during the night, earth emits radiation from its surface

all of these

Q22 | A reduction of nitrogen nutrient in plants:

affects leaf colour

reduces pigment concentration

increase the visible reflectivity

all of these

Q23 | Remote sensing techniques make use of the properties of ___________ emitted, reflected ordiffracted by the sensed objects:

electric waves

sound waves

electromagnetic waves

wind waves

Q24 | Which one of the following statement is incorrect regarding the electromagnetic radiation?

these are produced by the motion of electric charge

the oscillation of charged particles sets up changing electric fields

the changing electric fields induce the changing magnetic fields in the surrounding medium

none of these

Q25 | The altitudinal distance of a geostationary satellite from the earth is about:

26,000 km

30,000 km

36,000 km

44,000 km