Elements of Remote Sensing

A. Phytoplankton contains photosynthetically active pigment
B. An increase of phytoplankton increases the back scattering in the green region
C. An increase of phytoplankton absorbs the bule region rapidly
D. An increase of phytoplankton decreases the back scattering in the green region

A. During the day, earth reflects solar radiation
B. During the day, earth reflects both solar radiations the emission from its surface
C. During the night, earth emits radiation from its surface
D. All of these

A. Phase of a wave is expressed as a fraction of a period with respect to a reference
B. Phase is usually specified by angular measure with one period being 360°
C. The reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction
D. All of these

A. The function of an information system is to improve one s ability to make decisions
B. The information system is the chain of operations
C. A map is a collection of stored, analysed data, its stored information is suitability used in making decisions
D. All the above

A. The first man-made satellite, Sputnik-l’ was launched on 4th October, 1957
B. The United State’s Explorer 6 transmitted the first picture of the earth in August 1959
C. Television Infrared Observation Satellite (TIROS) designed for meteorological observations, started systematic earth observations from space from 1, April, 1960
D. All of these

A. The ratio of the up flux and down flux just above the snow surface, is called albedo
B. Spectral albedo of snow is calculated for the semi-infinite snow thickness
C. Water equivalent height of snow is the height of water column obtained by melting snow
D. All of these

A. Permeability is a measure of conducting the magnetic lines of force in the material
B. Permeability is a measure of the extent to which magnetic lines of force can penetrate a medium
C. Permeability is expressed as the ratio of the magnetic flux density B. to the field strength of the magnetizing field
D. All of these

A. Snow albedo falls at all wave length with the increase of grain size
B. The effect of grain size on reflection is maximum in the near-IR region
C. The effect of grain size on reflection is low in the visible region of the spectrum
D. All of these

A. The surface defined by the locus of points having same phase, is called a wave front
B. The wave whose surface of constant phase are parallel planes, is known as a plane wave
C. The relative phase difference between the waves is important and not the absolute phase of a point on the wave
D. All of these

A. Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
B. The rate of transfer of radiant energy is called flux and is expressed in watts
C. The radiant energy which falls upon a surface is termed as irradiance
D. All of these