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This set of Elements of Remote Sensing Multiple Choice Questions & Answers (MCQs) focuses on Elements Of Remote Sensing Set 3
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