REMOTE SENSING INTERVIEW QUESTIONS Source & Courtesy: http://www.indiabix.com/

Phytoplanktons: are microscopic plants are the first link in all the aquatic and marine food chains convert solar energy, dissolved carbon and nitrogen into organic biomass All of these Answer: Option D

27.  The maximum absorption of solar radiation due to ozone occurs at wave lengths: A. shorter than 0.3 μm B. shorter than 0.2 μm C. greater than 0.3 μm D. None of these   Answer: Option A

Which one of the following statements is correct to remote sensing? The basic property used to identify objects, is called signature. The ratio of the reflected flux to incident flux is called reflectance which varies fron 0 to 1 The surface from which emergent radiance is constant in all directions is called Lambertian surface. C. D. All of these. Answer: Option D

Which one of the following frequencies is a GPS? L1 with frequency 1520 MHz L1 with frequency 1575.42 MHz L1 with frequency 1227.6 MHz L1 with frequency 1280.43 Hz Answer: Option B

Snow cover on the earth surface: gives the highest reflectance in the visible spectrum shows marked variation in its reflectance characteristics Shows side variation in the grain size All the above Answer: Option D

Electromagnetic waves are characterised by: frequency wave length intensity direction of travel and plane of polarisation. All of these Answer: Option E

Answer: Option C The solid angle subtended by the sphere is: A. 2π B. 3π C. 4π D. 6π Answer: Option C

For accurate position fix, the three satellites: must be along a common arc must be in vertical line above the receiver must be widely separated and well distributed must be such that one satellite is overhead of the receiver and other two widely separated Answer: Option C

Pick up the correct statement from the following: Water molecules and salt-ions in the ocean scatter the lower wave length more An increase in the back scattering coefficient with shorter wave length gives a deep blue colour for clear oceanic water B. The ratio of the upwelling irradiance just below the surface and down welling irradiance just above the surface is called reflectance ratio. C. D. All of these Answer: Option D

Pick up the correct statement from the following: The wave length of gamma rays is 10-10 m The wave length of radio rays is 106 m The visible length occupies a small portion of the electromagnetic spectrum extending roughly from 0.4 μ m to 0.7μm wave length. C. D. All of these Answer: Option D

The various stages of formation of snow are listed below: Formation of ice crystals Formation of snow pallets Formation of snow flakes Formation of snow crystals Formation of rimed crystals Which one of the following sequences is correct? A. 3 2 5 1 4 B. 5 3 1 2 4 C. 1 4 3 5 2 D. 1 3 4 2 5 Answer: Option C

Snow consists of snow crystals rimed snow crystals snow flakes All of these Answer: Option D

For perfect coherent radiation, which one of the following statement is correct? Both the waves must have single frequencies The directions of motion of both waves are parallel. The waves must be collimated All of these Answer: Option D

Fresh and pure snow reflectance is very high in visible region falls off steeply in the near-IR region remains low for longer wave lengths All of these Answer: Option D

Snow albedo is affected by: wave length grain size solar zenith angle snow pack thickness All of these Answer: Option E

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The emission of electrons from a metal plate exposed to light depends on the: intensity of the light frequency of light both (a) and (b) neither (a) nor (b)

The range measurements in GPS are made with: 3 L - band frequencies 2 L - band frequencies 2 C - band frequencies 3 C - band frequencies

'A time varying magnetic field produces an electric field' 'A time varying magnetic field produces an electric field'. This phenomenon is known as Newton's law Kirchoff law Ampere Maxwell law Faraday's law

For obtaining accurate distance of the satellite the GPS receiver slides its codes backwards until it synchronises with the satellite signals the signal arrival time is corrected for tropospheric and ionospheric delays the carrier phase measurement technique is adopted All of these GPS has been widely recognized as accurate, fast and cost-effective method for the following: Collection of the geographic coordinate data used in GIS for movement of navigation For determination of precise orbit and altitude of low earth orbiting satellites All of these