Elements Of Remote Sensing MCQs

Option A: Phytoplankton contains photosynthetically active pigment

Option B: An increase of phytoplankton increases the back scattering in the green region

Option C: An increase of phytoplankton absorbs the bule region rapidly

Option D: An increase of phytoplankton decreases the back scattering in the green region

Correct Answer: An increase of phytoplankton decreases the back scattering in the green region ✔

Option A: During the day, earth reflects solar radiation

Option B: During the day, earth reflects both solar radiations the emission from its surface

Option C: During the night, earth emits radiation from its surface

Option D: All of these

Correct Answer: All of these ✔

Option A: Phase of a wave is expressed as a fraction of a period with respect to a reference

Option B: Phase is usually specified by angular measure with one period being 360°

Option 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

Option D: All of these

Correct Answer: All of these ✔

Option A: The function of an information system is to improve one s ability to make decisions

Option B: The information system is the chain of operations

Option C: A map is a collection of stored, analysed data, its stored information is suitability used in making decisions

Option D: All the above

Correct Answer: All the above ✔

Option A: The first man-made satellite, Sputnik-l’ was launched on 4th October, 1957

Option B: The United State’s Explorer 6 transmitted the first picture of the earth in August 1959

Option C: Television Infrared Observation Satellite (TIROS) designed for meteorological observations, started systematic earth observations from space from 1, April, 1960

Option D: All of these

Correct Answer: All of these ✔

Option A: The ratio of the up flux and down flux just above the snow surface, is called albedo

Option B: Spectral albedo of snow is calculated for the semi-infinite snow thickness

Option C: Water equivalent height of snow is the height of water column obtained by melting snow

Option D: All of these

Correct Answer: All of these ✔

Option A: Permeability is a measure of conducting the magnetic lines of force in the material

Option B: Permeability is a measure of the extent to which magnetic lines of force can penetrate a medium

Option C: Permeability is expressed as the ratio of the magnetic flux density B. to the field strength of the magnetizing field

Option D: All of these

Correct Answer: All of these ✔

Option A: Snow albedo falls at all wave length with the increase of grain size

Option B: The effect of grain size on reflection is maximum in the near-IR region

Option C: The effect of grain size on reflection is low in the visible region of the spectrum

Option D: All of these

Correct Answer: All of these ✔

Option A: The surface defined by the locus of points having same phase, is called a wave front

Option B: The wave whose surface of constant phase are parallel planes, is known as a plane wave

Option C: The relative phase difference between the waves is important and not the absolute phase of a point on the wave

Option D: All of these

Correct Answer: All of these ✔

Option A: Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation

Option B: The rate of transfer of radiant energy is called flux and is expressed in watts

Option C: The radiant energy which falls upon a surface is termed as irradiance

Option D: All of these

Correct Answer: All of these ✔

Option A: Frequency is the number of wave crests passing a fixed point in one second

Option B: Frequency of a wave is measured in Hertz (Hz)

Option C: Amplitude of a wave is the height of its crust from the mid-point

Option D: All of these

Correct Answer: All of these ✔

Option A: Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system

Option B: Topological characteristics of an object are independent of scale measurement

Option C: The three elements of topology are adjacency, containment, and connectivity

Option D: All of these

Correct Answer: All of these ✔

Option A: In remote sensing technique, the observation place, is called a platform

Option B: Platforms may be either stationary or mobile

Option C: Spatial resolution of the imaging system becomes poorer with increase of platform height

Option D: All of these

Correct Answer: All of these ✔

Option A: The vertical section of the soil extending into the parent material, is called profile

Option B: The layers of the soil parallel to the earth surface are called horizons

Option C: The transitional layer between two adjoining horizons is called boundary

Option D: All of these

Correct Answer: All of these ✔

Option A: Indian space effort started in 1962 with the establishment of a rocket

Option B: Development of space (DOS) was established by the Government of India in 1972

Option C: Indian Space Research Organisation (ISRO) is responsible for the space technology and its application to various activities

Option D: All of these

Correct Answer: All of these ✔

Option A: For the same feature, the photograph taken from the satellite vertically above the aircraft, the height displacement is lesser than the aerial photograph

Option B: The scale of the aerial photograph depends upon the scale of the topography

Option C: The feature at the principal point has no height displacement

Option D: All of the above

Correct Answer: All of the above ✔

Option A: A graphical representation of spectral reflectance verses the various growth stages of a crop, depicts a phonologic pattern

Option B: The changes in the polarisation of the radiation reflected or emitted by an object, is known as polarisation variation

Option C: The degree of polarisation is a characteristic of the object which helps in the identification of the object

Option D: All of these

Correct Answer: All of these ✔

Option A: Identification

Option B: Recognition of objects

Option C: Judging the significance of objects

Option D: All of these

Correct Answer: All of these ✔

Option A: Electric waves

Option B: Sound waves

Option C: Electromagnetic waves

Option D: Wind waves

Correct Answer: Electromagnetic waves ✔

Option A: 26,000 km

Option B: 30,000 km

Option C: 36,000 km

Option D: 44,000 km

Correct Answer: 36,000 km ✔

Option A: The off-nadir resolution is degraded

Option B: The ground distance swept by the senor, IFOV is proportional to sec2 of scan measured from the nadir

Option C: The details towards the edge of the scan get compressed

Option D: All of these

Correct Answer: All of these ✔

Option A: Positional accuracies ~ 1 – 2 m if rover is less than 1-2 km from the reference station

Option B: Positional accuracies ~ 2 – 5m if rover is less than 2-5 fm from the reference station

Option C: Positional accuracies ~ 5 – 10 m if rover is less than 5-10 km from reference station

Option D: Positional accuracies ~ 5 – 10 m if rover is less than 25 km

Correct Answer: Positional accuracies ~ 1 – 2 m if rover is less than 1-2 km from the reference station ✔

Option A: Passive remote sensing

Option B: Active remote sensing

Option C: Neutral remote sensing

Option D: None of these

Correct Answer: Active remote sensing ✔

Option A: Increases with salinity

Option B: Increases with temperature

Option C: Decreases with salinity

Option D: Decreases with temperature

Correct Answer: Increases with salinity ✔

Option A: Ozone hole

Option B: Atmospheric window

Option C: Ozone window

Option D: Black hole

Correct Answer: Atmospheric window ✔

Option A: Sensors

Option B: Passive sensors

Option C: Active sensors

Option D: None of these

Correct Answer: Active sensors ✔

Option A: 15,200 km

Option B: 26,600 km

Option C: 18,400 km

Option D: 36,000 km

Correct Answer: 26,600 km ✔

Option A: Fresnel reflection

Option B: Fresnel refraction

Option C: Snell’s law

Option D: None of these

Correct Answer: Fresnel reflection ✔

Option A: Evelyn L. Pruitt, a geographer

Option B: Gaspard Felix Tournachon, a French scientist

Option C: Wilbur Wright, an Italian scientist

Option D: None of these

Correct Answer: Evelyn L. Pruitt, a geographer ✔

Option A: Sun as the source of energy

Option B: Flash light as a source of energ

Option C: Its own source of energy

Option D: None of these

Correct Answer: Sun as the source of energy ✔

Option A: Radiometric resolution

Option B: Spatial resolution

Option C: Spectral resolution

Option D: All of these

Correct Answer: All of these ✔

Option A: Reduces the contrast of the image and also its sharpness

Option B: Increases the contrast of the image but reduces the sharpness

Option C: Increases both the contrast and sharpness

Option D: Reduces the contrast but increases the sharpness

Correct Answer: Reduces the contrast of the image and also its sharpness ✔

Option A: Physical weathering of rocks

Option B: Chemical weathering of rocks

Option C: Biological weathering of rocks

Option D: All of these

Correct Answer: All of these ✔

Option A: Cm = 1/

Option B: Cm

Option C: Cm

Option D: None of these

Correct Answer: Cm ✔

Option A: Parabolic antenna

Option B: Microstrip antenna

Option C: Horn antenna

Option D: Slotted antenna

Correct Answer: Microstrip antenna ✔

Option A: Colour

Option B: Symbology

Option C: Legends

Option D: South arrow

Correct Answer: South arrow ✔

Option A: Electronic clocks

Option B: Atomic clocks

Option C: Quartz clocks

Option D: Mechanical clocks

Correct Answer: Quartz clocks ✔

Option A: 130 km

Option B: 230 km

Option C: 250 km

Option D: 500 km

Correct Answer: 230 km ✔

Option A: C = v

Option B: C = /v

Option C: C = v

Option D: C = 1/

Correct Answer: C = v ✔

Option A: Ultraviolet frequency region

Option B: Infrared frequency region

Option C: Radio frequency region

Option D: All of these

Correct Answer: All of these ✔

Option A: Scan skew

Option B: Panoramic distortion

Option C: Earth rotation

Option D: Altitude variation

Correct Answer: Altitude variation ✔

Option A: The frequency

Option B: The reciprocal of the energy

Option C: The square of the frequency

Option D: The square root of the frequency

Correct Answer: The frequency ✔

Option A: 8

Option B: 12

Option C: 16

Option D: 24

Correct Answer: 24 ✔

Option A: Spectral variation

Option B: Spatial variation

Option C: Temporal variation

Option D: All of these

Correct Answer: All of these ✔

Option A: Synoptic view of a large area

Option B: Constant solar zenith angles and similar illumination conditions

Option C: Repetitive observations of the same area with intervals of a few minutes to a few weeks

Option D: All of these

Correct Answer: All of these ✔

Option A: 25 km

Option B: 50 km

Option C: 75 km

Option D: 100 km

Correct Answer: 100 km ✔

Option A: Produces a time varying magnetic field and vice versa

Option B: Once generated, remains self-propagating

Option C: Is capable to travel across space

Option D: All of these

Correct Answer: All of these ✔

Option A: Height displacement of A will be less than that of B

Option B: Height displacement of B will be less than that of A

Option C: Height displacement of A and B is equal

Option D: Height displacement of A and B will be towards each other

Correct Answer: Height displacement of A will be less than that of B ✔

Option A: 1, 2, 3

Option B: 1, 3

Option C: 2, 3

Option D: 1, 2

Correct Answer: 1, 2, 3 ✔

Option A: 10-10 to 106 m

Option B: 10-8 to 106 m

Option C: 10-10 to 1010 m

Option D: 10-8 to 108 m

Correct Answer: 10-10 to 106 m ✔

Option A: Satellite dependent biases due to uncertainty in the orbital parameters of the satellite

Option B: Receiver -dependent biases due to clock stability with line

Option C: Signal propagation biases due to the sphere and troposphere propagation

Option D: All the above

Correct Answer: All the above ✔

Option A: Angle of incidence is equal to angle of refraction

Option B: Angle of incidence is greater than the angle of refraction

Option C: Angle of incidence is equal to 90°

Option D: Angle of refraction is equal to 90°

Correct Answer: Angle of refraction is equal to 90° ✔

Option A: The pigments

Option B: Internal cell structur

Option C: Equivalent water content

Option D: All of these

Correct Answer: All of these ✔

Option A: Altitude variation

Option B: Altitude

Option C: Orbit drift

Option D: All of these

Correct Answer: All of these ✔

Option A: h = dp/(B/H)

Option B: h = (B/H) dp

Option C: h = dp/(H/B)

Option D: h = (H/B) dp

Correct Answer: h = dp/(B/H) ✔

Option A: When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed

Option B: When the electric vector is in the plane of incidence, vertical polarisation is formed

Option C: When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed

Option D: All of these

Correct Answer: All of these ✔

Option A: Spectral variation

Option B: Spatial variation

Option C: Temporal variation

Option D: None of these

Correct Answer: Spatial variation ✔

Option A: The refractive index of a medium varies according to the wavelength of the radiation,

Option B: The variation of the refractive index with wave length, is called dispersion,

Option C: The splitting of colours of white light by passing through a prism is caused due to dispersion

Option D: All of these

Correct Answer: All of these ✔

Option A: Propagation of modulated light waves

Option B: Propagation of infrared radiation

Option C: The visible light as carrier with frequency of the order of 5 × 1014 Hz

Option D: High frequency radio waves

Correct Answer: Propagation of modulated light waves ✔

Option A: Directions of both the fields are orthogonal

Option B: Both the fields are at right angles to the direction of propagation

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Vehicle tracking

Option B: Land navigation

Option C: Trans movement

Option D: All of these

Correct Answer: All of these ✔

Option A: 16,200 km

Option B: 20,200 km

Option C: 24,400 km

Option D: 36,100 km

Correct Answer: 20,200 km ✔

Option A: 1, 2, 3, 4

Option B: 2, 3, 4, 1

Option C: 2, 4, 3, 1

Option D: 3, 1, 2 , 4

Correct Answer: 2, 4, 3, 1 ✔

Option A: Common boundary between two areas of a locality is known as adjacency

Option B: The area features which are wholly contained within another area feature, is known so containment

Option C: The geometric property which describes the linkage between line features is defined as connectivity

Option D: All of these

Correct Answer: All of these ✔

Option A: The angle of incidence is equal to the angle of refraction

Option B: The angle of refraction r) is given by sin i

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: The angle of refraction r) is given by sin i ✔

Option A: Gamma rays (wave length < 10-10 m)

Option B: Ultraviolet rays (wave length < 10-6 m)

Option C: Infrared rays (wave length < 10 -4 m)

Option D: All of these

Correct Answer: All of these ✔

Option A: Radiant energy (Q)

Option B: Radiant flux (Φe )

Option C: Radiant intensity (I)

Option D: All of these

Correct Answer: All of these ✔

Option A: Circular orbit

Option B: Sun-synchronous orbit

Option C: Near polar orbit

Option D: None of these

Correct Answer: Sun-synchronous orbit ✔

Option A: Visible (0.4 –

Option B: Near-IR (0.7 –

Option C: Short wave-IR (1.3 –

Option D: None of these

Correct Answer: Short wave-IR (1.3 – ✔

Option A: Six ground stations

Option B: Five ground stations

Option C: Four ground stations

Option D: Three ground stations

Correct Answer: Five ground stations ✔

Option A: Spectral variation

Option B: Spatial variation

Option C: Temporal variation

Option D: None of these

Correct Answer: Temporal variation ✔

Option A: Atmospheric window

Option B: Signature

Option C: Radiometric error

Option D: None of these

Correct Answer: Signature ✔

Option A: Reflectance

Option B: Reflectance factor

Option C: Albedo

Option D: None of these

Correct Answer: Albedo ✔

Option A: These are produced by the motion of electric charge

Option B: The oscillation of charged particles sets up changing electric fields

Option C: The changing electric fields induce the changing magnetic fields in the surrounding medium

Option D: None of these

Correct Answer: None of these ✔

Option A: Affects leaf colour

Option B: Reduces pigment concentration

Option C: Increase the visible reflectivity

Option D: All of these

Correct Answer: All of these ✔

Option A: The nominal altitude is about 20,200 km

Option B: The inclination of axis satellite is 55°

Option C: The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)

Option D: All of these

Correct Answer: All of these ✔

Option A: Absorption by the dissolved material

Option B: Absorption by the suspended particulate matter

Option C: Scattering by the suspended particulate matter

Option D: All of these

Correct Answer: All of these ✔

Option A: The interaction of the electromagnetic radiation with the target

Option B: The emission of electromagnetic radiation from the target

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Focal length

Option B: Flying height

Option C: Ground elevation

Option D: None of these

Correct Answer: None of these ✔

Option A: Angle of incidence = angle of refraction

Option B: Angle of incidence = angle of reflection

Option C: Angle of refraction = sum of the angles of incidence and refraction

Option D: All the above

Correct Answer: Angle of incidence = angle of reflection ✔

Option A: The minimum frequency of light for which no electrons are emitted, is called threshold frequency

Option B: Polarising angle of glass is 57.5°

Option C: At the polarising angle, the reflected and refracted rays are orthogonal

Option D: All the above

Correct Answer: All the above ✔

Option A: sin2

Option B: cos2

Option C: sec2

Option D: tan2

Correct Answer: sec2 ✔

Option A: Solar zenith angle

Option B: Azimuth angle

Option C: Look angle

Option D: All of these

Correct Answer: All of these ✔

Option A: Constant in time

Option B: Constant in space

Option C: Constant in time and space

Option D: None of these

Correct Answer: Constant in time ✔

Option A: Cloud evolution

Option B: Vegetative cover

Option C: Snow cover

Option D: All of these

Correct Answer: All of these ✔

Option A: Directly proportional to the bandwidth

Option B: Inversely proportional to the bandwidth

Option C: The square of the bandwidth

Option D: None of these

Correct Answer: Inversely proportional to the bandwidth ✔