Dear Readers, Welcome to ELEMENTS of REMOTE SENSING Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of ELEMENTS of REMOTE SENSING. These ELEMENTS of REMOTE SENSING Questions are very important for campus placement test and job interviews. As per my experience good interviewers hardly plan to ask any particular questions during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT companies.
A. Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
B. Topological characteristics of an object are independent of scale measurement
C. The three elements of topology are adjacency, containment, and connectivity
D. All of these
ANS: D
A. In remote sensing technique, the observation place, is called a platform
B. Platforms may be either stationary or mobile
C. Spatial resolution of the imaging system becomes poorer with increase of platform height
D. All of these
ANS: D
A. Just above the freezing point
B. At the freezing point
C. Below the freezing point
D. None of these
ANS: C
A. Constant in time
B. Constant in space
C. Constant in time and space
D. None of these
ANS: C
A. Indian space effort started in 1962 with the establishment of a rocket
B. Development of space (DOS) was established by the Government of India in 1972
C. Indian Space Research Organisation (ISRO) is responsible for the space technology and its application to various activities
D. All of these
ANS: D
A. For the same feature, the photograph taken from the satellite vertically above the aircraft, the height displacement is lesser than the aerial photograph
B. The scale of the aerial photograph depends upon the scale of the topography
C. The feature at the principal point has no height displacement
D. All of the above
ANS: D
A. Directly proportional to the bandwidth
B. Inversely proportional to the bandwidth
C. The square of the bandwidth
D. None of these
ANS: B
A. A graphical representation of spectral reflectance verses the various growth stages of a crop, depicts a phonologic pattern
B. The changes in the polarisation of the radiation reflected or emitted by an object, is known as polarisation variation
C. The degree of polarisation is a characteristic of the object which helps in the identification of the object
D. All of these
ANS: D
A. Cloud evolution
B. Vegetative cover
C. Snow cover
D. All of these
ANS: D
A. Solar zenith angle
B. Azimuth angle
C. Look angle
D. All of these
ANS: D
A. Is a diffuse emitter
B. Absorbs all the radiations of every wave lengths
C. Emits power of every wave length
D. All the above
ANS: D
A. sin2
B. cos2
C. sec2
D. tan2
ANS: C
A. The vertical section of the soil extending into the parent material, is called profile
B. The layers of the soil parallel to the earth surface are called horizons
C. The transitional layer between two adjoining horizons is called boundary
D. All of these
ANS: D
A. Angle of incidence = angle of refraction
B. Angle of incidence = angle of reflection
C. Angle of refraction = sum of the angles of incidence and refraction
D. All the above
ANS: B
A. The minimum frequency of light for which no electrons are emitted, is called threshold frequency
B. Polarising angle of glass is 57.5°
C. At the polarising angle, the reflected and refracted rays are orthogonal
D. All the above
ANS: D
A. Focal length
B. Flying height
C. Ground elevation
D. None of these
ANS: D
A. The interaction of the electromagnetic radiation with the target
B. The emission of electromagnetic radiation from the target
C. Both A. and B.
D. Neither A. nor B.
ANS: C
A. Absorption by the dissolved material
B. Absorption by the suspended particulate matter
C. Scattering by the suspended particulate matter
D. All of these
ANS: D
A. Frequency is the number of wave crests passing a fixed point in one second
B. Frequency of a wave is measured in Hertz (Hz)
C. Amplitude of a wave is the height of its crust from the mid-point
D. All of these
ANS: D
A. Identification
B. Recognition of objects
C. Judging the significance of objects
D. All of these
ANS: D
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
ANS: D
A. The nominal altitude is about 20,200 km
B. The inclination of axis satellite is 55°
C. The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)
D. All of these
ANS: D
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
ANS: D
A. Affects leaf colour
B. Reduces pigment concentration
C. Increase the visible reflectivity
D. All of these ANS: D
A. Electric waves
B. Sound waves
C. Electromagnetic waves
D. Wind waves
ANS: C
A. These are produced by the motion of electric charge
B. The oscillation of charged particles sets up changing electric fields
C. The changing electric fields induce the changing magnetic fields in the surrounding medium
D. None of these
ANS: D
A. 26,000 km
B. 30,000 km
C. 36,000 km
D. 44,000 km
ANS: C
A. Reflectance
B. Reflectance factor
C. Albedo
D. None of these
ANS: C
A. The off-nadir resolution is degraded
B. The ground distance swept by the senor, IFOV is proportional to sec2 of scan measured from the nadir
C. The details towards the edge of the scan get compressed
D. All of these
ANS: D
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
ANS: D
A. Positional accuracies ~ 1 – 2 m if rover is less than 1-2 km from the reference station
B. Positional accuracies ~ 2 – 5m if rover is less than 2-5 fm from the reference station
C. Positional accuracies ~ 5 – 10 m if rover is less than 5-10 km from reference station
D. Positional accuracies ~ 5 – 10 m if rover is less than 25 km ANS: A
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
ANS: D
A.
B. The cone subtended by an area on the sphere at the centre, is called the solid angle
C. The solid angle is equal to the ratio of the area on the sphere and the square of the radius of the sphere
D. All of these
ANS: D
A. USA
B. European Union
C. Russia
D. India
ANS: D
A. Hertz’s law
B. Ampere Maxwell’s law
C. Faraday’s law
D.
ANS: B
A. Spectral variation
B. Spatial variation
C. Temporal variation
D. None of these
ANS: C
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
ANS: D
A. Six ground stations
B. Five ground stations
C. Four ground stations
D. Three ground stations
ANS: B
A. Atmospheric window
B. Signature
C. Radiometric error
D. None of these
ANS: B
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
ANS: D
A. Visible (0.4 –
B. Near-IR (0.7 –
C. Short wave-IR (1.3 –
D. None of these
ANS: C
A. Passive remote sensing
B. Active remote sensing
C. Neutral remote sensing
D. None of these
ANS: B
A. Circular orbit
B. Sun-synchronous orbit
C. Near polar orbit
D. None of these
ANS: B
A. Gamma rays (wave length < 10-10 m)
B. Ultraviolet rays (wave length < 10-6 m)
C. Infrared rays (wave length < 10 -4 m)
D. All of these
ANS: D
A. Radiant energy (Q)
B. Radiant flux ( )
C. Radiant intensity (I)
D. All of these
ANS: D
A. The angle of incidence is equal to the angle of refraction
B. The angle of refraction r) is given by sin i
C. Both A. and B.
D. Neither A. nor B.
ANS: B
A. Increases with salinity
B. Increases with temperature
C. Decreases with salinity
D. Decreases with temperature
ANS: A
A. Common boundary between two areas of a locality is known as adjacency
B. The area features which are wholly contained within another area feature, is known so containment
C. The geometric property which describes the linkage between line features is defined as connectivity
D. All of these
ANS: D
1. Generation of an output to the user
2. Detection of the GPS signals
3. Processing the data in the built-in-computer
4. Decoding the GPS signal.
The correct sequence of the stages is:
A. 1, 2, 3, 4
B. 2, 3, 4, 1
C. 2, 4, 3, 1
D. 3, 1, 2 , 4
ANS: C
A. 16,200 km
B. 20,200 km
C. 24,400 km
D. 36,100 km
ANS: B
A. Propagation of modulated light waves
B. Propagation of infrared radiation
C. The visible light as carrier with frequency of the order of 5 × 1014 Hz
D. High frequency radio waves
ANS: A
A. Vehicle tracking
B. Land navigation
C. Trans movement
D. All of these
ANS: D
A. The refractive index of a medium varies according to the wavelength of the radiation,
B. The variation of the refractive index with wave length, is called dispersion,
C. The splitting of colours of white light by passing through a prism is caused due to dispersion
D. All of these
ANS: D
A. Directions of both the fields are orthogonal
B. Both the fields are at right angles to the direction of propagation C. Both A. and B.
D. Neither A. nor B.
ANS: C
A. Spectral variation
B. Spatial variation
C. Temporal variation
D. None of these
ANS: B
A. Altitude variation
B. Altitude
C. Orbit drift
D. All of these
ANS: D
A. When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed
B. When the electric vector is in the plane of incidence, vertical polarisation is formed
C. When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed
D. All of these
ANS: D
A. The pigments
B. Internal cell structure
C. Equivalent water content
D. All of these
ANS: D
A. h = dp/(B/H)
B. h = (B/H) dp
C. h = dp/(H/B)
D. h = (H/B) dp ANS: A
A. Angle of incidence is equal to angle of refraction
B. Angle of incidence is greater than the angle of refraction
C. Angle of incidence is equal to 90°
D. Angle of refraction is equal to 90°
ANS: D
A. Synoptic view of a large area
B. Constant solar zenith angles and similar illumination conditions
C. Repetitive observations of the same area with intervals of a few minutes to a few weeks
D. All of these
ANS: D
A. 25 km
B. 50 km
C. 75 km
D. 100 km
ANS: D
A. Produces a time varying magnetic field and vice versa
B. Once generated, remains self-propagating
C. Is capable to travel across space
D. All of these
ANS: D
A. Satellite dependent biases due to uncertainty in the orbital parameters of the satellite
B. Receiver -dependent biases due to clock stability with line
C. Signal propagation biases due to the sphere and troposphere propagation
D. All the above
ANS: D
A. Height displacement of A will be less than that of B
B. Height displacement of B will be less than that of A
C. Height displacement of A and B is equal
D. Height displacement of A and B will be towards each other ANS: A
A. 10-10 to 106 m
B. 10-8 to 106 m
C. 10-10 to 1010 m
D. 10-8 to 108 m
ANS: A
1. The satellite orbit is fixed in the inertial space
2. During successive across-track imaging, the earth rotates beneath the sensor
3. The satellite images a skewed area
Which one of the following statements is/are correct?
A. 1, 2, 3
B. 1, 3
C. 2, 3
D. 1, 2
ANS: A
A. 8
B. 12
C. 16
D. 24
ANS: D
A. Spectral variation
B. Spatial variation
C. Temporal variation
D. All of these
ANS: D
A. The frequency
B. The reciprocal of the energy
C. The square of the frequency
D. The square root of the frequency
ANS: A
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
ANS: D
A. Scan skew
B. Panoramic distortion
C. Earth rotation
D. Altitude variation
ANS: D
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
ANS: D
A. Ultraviolet frequency region
B. Infrared frequency region
C. Radio frequency region
D. All of these
ANS: D
A. Ozone hole
B. Atmospheric window
C. Ozone window
D. Black hole
ANS: B
A. C = v
B. C = /v
C. C = v
D. C = 1/
ANS: C
A. Electronic clocks
B. Atomic clocks
C. Quartz clocks
D. Mechanical clocks
ANS: C
A. 130 km
B. 230 km
C. 250 km
D. 500 km ANS: B
A. Colour
B. Symbology
C. Legends
D. South arrow
ANS: D
A. Sensors
B. Passive sensors
C. Active sensors
D. None of these
ANS: C
A. Parabolic antenna
B. Microstrip antenna
C. Horn antenna
D. Slotted antenna
ANS: B
A. 15,200 km
B. 26,600 km
C. 18,400 km
D. 36,000 km
ANS: B
A. Cm = 1/
B. Cm
C. Cm
D. None of these
ANS: B
A. Reduces the contrast of the image and also its sharpness
B. Increases the contrast of the image but reduces the sharpness
C. Increases both the contrast and sharpness
D. Reduces the contrast but increases the sharpness ANS: A
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
ANS: D
A. Physical weathering of rocks
B. Chemical weathering of rocks
C. Biological weathering of rocks
D. All of these
ANS: D
A. Radiometric resolution
B. Spatial resolution
C. Spectral resolution
D. All of these
ANS: D
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
ANS: D
A. Fresnel reflection
B. Fresnel refraction
C. Snell’s law
D. None of these
ANS: A
A. Sun as the source of energy
B. Flash light as a source of energy
C. Its own source of energy
D. None of these
ANS: A
A. Evelyn L. Pruitt, a geographer
B. Gaspard Felix Tournachon, a French scientist
C. Wilbur Wright, an Italian scientist
D. None of these
ANS: A