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Objective Questions

Latest CMD DSSSC Kerala GIS Experts Exam Question (Objective Questions), MCQ in English

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Question Bank CMD DSSSC Kerala GIS Experts Exam - English
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GIS Experts

Question 1Single Answer
What is the basic source of energy in passive remote sensing?
  1. ARadar system
  2. BSun
  3. CSatellite sensor
  4. DEarth surface
Question 2Single Answer
Which part of the electromagnetic spectrum is visible to the human eye?
  1. A0.01–0.4 µm
  2. B0.4–0.7 µm
  3. C0.7–1.3 µm
  4. D1.3–3.0 µm
Question 3Single Answer
Which wavelength region is mainly used in thermal remote sensing?
  1. AVisible
  2. BNear infrared
  3. CThermal infrared
  4. DUltraviolet
Question 4Single Answer
Which region of EMS is commonly used in radar remote sensing?
  1. AUltraviolet
  2. BVisible
  3. CInfrared
  4. DMicrowave
Question 5Single Answer
Which electromagnetic radiation has the shortest wavelength?
  1. AInfrared
  2. BMicrowave
  3. CGamma rays
  4. DRadio waves
Question 6Single Answer
What does wavelength represent in electromagnetic radiation?
  1. AEnergy intensity
  2. BDistance between successive wave crests
  3. CSpeed of radiation
  4. DFrequency of radiation
Question 7Single Answer
Which unit is commonly used to measure wavelength in remote sensing?
  1. AHertz
  2. BJoule
  3. CMicrometer
  4. DTesla
Question 8Single Answer
Which law explains the relationship between wavelength and temperature of emitted radiation?
  1. APlanck’s law
  2. BWien’s displacement law
  3. CStefan–Boltzmann law
  4. DNewton’s law
Question 9Single Answer
Which law states that total radiant energy emitted is proportional to the fourth power of temperature?
  1. APlanck’s law
  2. BWien’s law
  3. CStefan–Boltzmann law
  4. DKirchhoff’s law
Question 10Single Answer
Which term describes the number of wave cycles per second?
  1. AAmplitude
  2. BVelocity
  3. CFrequency
  4. DRadiance
Question 11Single Answer
What happens when EMR is scattered by atmospheric particles?
  1. AEnergy is absorbed
  2. BEnergy is reflected
  3. CDirection of energy changes
  4. DEnergy is destroyed
Question 12Single Answer
Which type of scattering is caused by particles smaller than wavelength?
  1. AMie scattering
  2. BRayleigh scattering
  3. CNon-selective scattering
  4. DRaman scattering
Question 13Single Answer
Why does the sky appear blue?
  1. AAbsorption of red light
  2. BReflection of blue light
  3. CRayleigh scattering of shorter wavelengths
  4. DAtmospheric refraction
Question 14Single Answer
Which scattering occurs due to dust and smoke particles?
  1. ARayleigh scattering
  2. BMie scattering
  3. CNon-selective scattering
  4. DSpecular scattering
Question 15Single Answer
Which scattering affects visible and infrared wavelengths equally?
  1. ARayleigh
  2. BMie
  3. CNon-selective
  4. DAtmospheric window
Question 16Single Answer
Which atmospheric constituent strongly absorbs ultraviolet radiation?
  1. ANitrogen
  2. BOxygen
  3. COzone
  4. DCarbon dioxide
Question 17Single Answer
Which gas mainly absorbs thermal infrared radiation?
  1. AOxygen
  2. BNitrogen
  3. CWater vapor
  4. DHelium
Question 18Single Answer
What is an atmospheric window?
  1. AArea with no clouds
  2. BRegion of EMS with minimal atmospheric absorption
  3. CHole in ozone layer
  4. DRadar reflection zone
Question 19Single Answer
Which wavelength range is least affected by atmospheric conditions?
  1. AUltraviolet
  2. BVisible
  3. CMicrowave
  4. DThermal infrared
Question 20Single Answer
Atmospheric absorption mainly reduces which property of EMR?
  1. AWavelength
  2. BFrequency
  3. CEnergy reaching the sensor
  4. DSpeed of light
Question 21Single Answer
Which are the three main interactions of EMR with Earth surface?
  1. AReflection, refraction, absorption
  2. BReflection, absorption, transmission
  3. CDiffraction, scattering, absorption
  4. DEmission, conduction, convection
Question 22Single Answer
What is reflectance?
  1. AAbsorbed energy
  2. BEmitted energy
  3. CRatio of reflected energy to incident energy
  4. DTotal incoming energy
Question 23Single Answer
Which surface reflects energy uniformly in all directions?
  1. ASpecular surface
  2. BLambertian surface
  3. CSmooth surface
  4. DMetallic surface
Question 24Single Answer
Which surface causes mirror-like reflection?
  1. ARough surface
  2. BVegetated surface
  3. CSpecular surface
  4. DLambertian surface
Question 25Single Answer
Which factor does NOT affect surface reflectance?
  1. ASurface roughness
  2. BMoisture content
  3. CSun angle
  4. DSatellite orbit height
Question 26Single Answer
Which soil property strongly affects reflectance?
  1. AColor
  2. BTexture
  3. CMoisture content
  4. DAll of the above
Question 27Single Answer
Wet soil shows what reflectance behavior?
  1. AHigher reflectance
  2. BLower reflectance
  3. CNo change
  4. DMaximum reflectance in visible
Question 28Single Answer
Dry soils generally reflect more in which region?
  1. AUltraviolet
  2. BVisible and near infrared
  3. CMicrowave
  4. DThermal infrared
Question 29Single Answer
Soil organic matter mainly affects which spectral region?
  1. AMicrowave
  2. BVisible
  3. CThermal infrared
  4. DRadio waves
Question 30Single Answer
Which soil type has highest reflectance?
  1. AWet clay soil
  2. BOrganic soil
  3. CDry sandy soil
  4. DPeaty soil
Question 31Single Answer
Pure water strongly absorbs EMR in which region?
  1. ABlue
  2. BGreen
  3. CNear infrared
  4. DUltraviolet
Question 32Single Answer
Why do deep water bodies appear dark in satellite images?
  1. AHigh reflection
  2. BHigh absorption
  3. CHigh transmission
  4. DHigh scattering
Question 33Single Answer
Which wavelength penetrates water the least?
  1. ABlue
  2. BGreen
  3. CRed
  4. DNear infrared
Question 34Single Answer
Turbid water reflects more in which region?
  1. ANear infrared
  2. BVisible
  3. CMicrowave
  4. DThermal infrared
Question 35Single Answer
Which factor increases water reflectance?
  1. ADepth
  2. BChlorophyll
  3. CSuspended sediments
  4. DSalinity
Question 36Single Answer
Vegetation strongly reflects in which region?
  1. ABlue
  2. BRed
  3. CNear infrared
  4. DThermal infrared
Question 37Single Answer
Why does healthy vegetation appear green?
  1. AAbsorbs green light
  2. BReflects green light
  3. CAbsorbs blue light only
  4. DReflects red light only
Question 38Single Answer
Which pigment absorbs red and blue light?
  1. ACarotene
  2. BXanthophyll
  3. CChlorophyll
  4. DAnthocyanin
Question 39Single Answer
Which vegetation condition gives highest NIR reflectance?
  1. ADry vegetation
  2. BStressed vegetation
  3. CHealthy vegetation
  4. DDead vegetation
Question 40Single Answer
Red edge refers to what phenomenon?
  1. ARed absorption peak
  2. BSharp increase from red to NIR reflectance
  3. CThermal emission
  4. DMicrowave reflection
Question 41Single Answer
Which index uses red and NIR bands?
  1. ANDVI
  2. BSAVI
  3. CEVI
  4. DAll of the above
Question 42Single Answer
Which surface shows lowest reflectance in visible spectrum?
  1. ADry soil
  2. BHealthy vegetation
  3. CWater body
  4. DUrban area
Question 43Single Answer
Which EMR interaction dominates thermal remote sensing?
  1. AReflection
  2. BAbsorption
  3. CEmission
  4. DScattering
Question 44Single Answer
Active remote sensing differs from passive because it uses?
  1. ASun energy
  2. BReflected energy
  3. CIts own energy source
  4. DThermal energy
Question 45Single Answer
Radar sensors operate independent of which factor?
  1. ASurface roughness
  2. BCloud cover
  3. CMoisture
  4. DGeometry
Question 46Single Answer
Which wavelength is best for vegetation health analysis?
  1. ABlue
  2. BGreen
  3. CNear infrared
  4. DThermal infrared
Question 47Single Answer
Which surface acts closest to Lambertian reflector?
  1. ACalm water
  2. BBare soil
  3. CDense vegetation
  4. DMetal roof
Question 48Single Answer
Which factor increases atmospheric scattering?
  1. ALonger wavelength
  2. BSmaller particles
  3. CMicrowave radiation
  4. DLow altitude
Question 49Single Answer
Which spectral band is most affected by atmospheric scattering?
  1. ABlue
  2. BRed
  3. CNIR
  4. DMicrowave
Question 50Single Answer
Which region is ideal for night-time imaging?
  1. AVisible
  2. BNIR
  3. CThermal infrared
  4. DUltraviolet
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