Elements Of Remote Sensing Set 3 MCQs

Q1 | If flying height of a spacecraft is H, the length of air base is B and the parallax difference betweentwo points is dp, then the difference in height

h = dp/(b/h)

h = (b/h) dp

h = dp/(h/b)

h = (h/b) dp

Q2 | Critical angle of electromagnetic radiation takes place if

angle of incidence is equal to angle of refraction

angle of incidence is greater than the angle of refraction

angle of incidence is equal to 90°

angle of refraction is equal to 90°

Q3 | Earth observations from a satellite platform provide:

synoptic view of a large area

constant solar zenith angles and similar illumination conditions

repetitive observations of the same area with intervals of a few minutes to a few weeks

all of these

Q4 | DGPS is based on the concept that bias errors in the position of locations in a given local area, aresame if their distances are within

25 km

50 km

75 km

100 km

Q5 | Electromagnetic radiation:

produces a time varying magnetic field and vice versa

once generated, remains self-propagating

is capable to travel across space

all of these

Q6 | Which one of the following residual biases involves the GPS accuracy?

satellite dependent biases due to uncertainty in the orbital parameters of the satellite

receiver-dependent biases due to clock stability with line

signal propagation biases due to the sphere and troposphere propagation

all the above

Q7 | A and B are two towers of equal height diametrically opposite on either side of the nadir point,at 3 km and 5 km distances. Which one of the following statements is correct?

height displacement of a will be less than that of b

height displacement of b will be less than that of a

height displacement of a and b is equal

height displacement of a and b will be towards each other

Q8 | The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is:

8

12

16

24

Q9 | Pick up the important characteristic of a target which facilitates its identification from thefollowing:

spectral variation

spatial variation

temporal variation

all of these

Q10 | The value of energy quantum for radiation of any frequency is proportional to:

the frequency

the reciprocal of the energy

the square of the frequency

the square root of the frequency

Q11 | Which one of the following geometric errors of satellite sensors is random?

scan skew

panoramic distortion

earth rotation

altitude variation

Q12 | Pick up the correct statement from the following:

the first man-made satellite, sputnik-l\ was launched on 4th october, 1957

the united state\s explorer 6 transmitted the first picture of the earth in august 1959

television infrared observation satellite (tiros) designed for meteorological observations, started systematic earth observations from space from 1, april, 1960

all of these

Q13 | Which one of the following frequency regions is a part of sun's radiation?

ultraviolet frequency region

infrared frequency region

radio frequency region

all of these

Q14 | The spectral region of the electromagnetic radiation which passes through the atmospherewithout much attenuation is known as:

ozone hole

atmospheric window

ozone window

black hole

Q15 | In GPS, receivers used are;

electronic clocks

atomic clocks

quartz clocks

mechanical clocks

Q16 | For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherencelength loch is:

130 km

230 km

250 km

500 km

Q17 | Which one of the following attributes is not associated with digital maps

colour

symbology

legends

south arrow

Q18 | The instruments which provide electromagnetic radiation of specified wave length or a band ofwave lengths to illuminate the earth surface are called:

sensors

passive sensors

active sensors

none of these

Q19 | The most widely used antenna in GPS is

parabolic antenna

microstrip antenna

horn antenna

slotted antenna

Q20 | Orbital radius of GPS satellites is approximately:

15,200 km

26,600 km

18,400 km

36,000 km

Q21 | The part radiation due to scattered/diffused radiation entering the field of view of a remotesensor other than that from the required target,

reduces the contrast of the image and also its sharpness

increases the contrast of the image but reduces the sharpness

increases both the contrast and sharpness

reduces the contrast but increases the sharpness

Q22 | Pick up the correct statement from the following

the ratio of the up flux and down flux just above the snow surface, is called albedo

spectral albedo of snow is calculated for the semi-infinite snow thickness

water equivalent height of snow is the height of water column obtained by melting snow

all of these

Q23 | Spatial variation in horizontal and vertical directions is caused due to:

physical weathering of rocks

chemical weathering of rocks

biological weathering of rocks

all of these