  ## Elements of Remote Sensing MCQ Practice Questions (Civil) Set 3

##### The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

Options are :

• 10^(-8) to 10^(6) m
• 10^(-10) to 10^(10) m
• 10^(-10) to 10^(6) m
• 10^(-8) to 10^(8) m

##### Remote sensing techniques makes use of the properties of-----emitted, reflected or diffracted by the sensed objects:

Options are :

• Electromagnetic waves
• Wind waves
• Electric waves
• Soundwaves

##### Pick up the correct statement from the following:

Options are :

• All of these
• Topological characteristics of an object are independent of scale measurement
• Topology describes the geometric characteristic of objects which do not change under transformations and are independent of any coordinate system
• The three elements of topology are adjacency, containment, and connectivity

##### The remote sensing techniques applied for the earth's surface features, is generally confined to the following wave lengths:

Options are :

• 0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 ?m
• 4.2 to 5.0, 7.0 to 15.0 ?m and 1 cm to 30 cm
• All of these
• 2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 ?m

##### Which one the following is a correct statement ?

Options are :

• The vertical section of the soil extending into the parent material, is called profile
• All of these
• The transitional layer between two adjoining horizons, is called boundary
• The layers of the soil parallel to the earth surface, are called horizons

##### The reflection of solar energy is characterised by the water content in the leaf, in the reflective optical infrared:

Options are :

• Near-IR (0.7 - 1.3 ?m) region
• Visible (0.4 - 0.7 ?m) region
• Short wave-IR (1.3 - 2.7 ?m) region
• None of these

Answer :Short wave-IR (1.3 - 2.7 ?m) region

Options are :

• B
• C
• A
• D

##### Which one of the following helps to identify the objects on the earth surface ?

Options are :

• Atmospheric window
• None of these
• Signature

Options are :

• Produces a time varying magnetic field and vice versa
• All of these
• Is capable to travel across space
• Once generated, remains self propagating
• Consists of magnetic and electric fields

##### The coherence length over which there is a strong relationship between amplitudes is:

Options are :

• Inversely proportional to the bandwidth
• Directly proportional to the bandwidth
• The square of the bandwidth
• None of these

Answer :Inversely proportional to the bandwidth

##### Which one of the following statements is correct regarding the GPS satellites ?

Options are :

• The inclination of axis satellite is 55�
• All of these
• The nominal altitude is about 20, 200 km
• The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)

##### The basic requirement of any sensor system, is:

Options are :

• Spatial resolution
• Spectral resolution
• All of these
• Temporal resolution

Options are :

• 1, 2, 3, 4
• 2, 3, 4, 1
• 2, 4, 3, 1
• 3, 1, 2 , 4

##### "An Electromagnetic wave falls on to a boundary between two loss less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media"This phenomenon is known as:

Options are :

• Fresnel refraction
• Snell's law
• Fresnel reflection
• None of these

##### Pick up the correct statement from the following:

Options are :

• All of these
• The force between the magnetic poles is inversely proportional to the permeability of the medium
• Permeability is expressed as the ratio of the magnetic flux density (B) to the field strength of the magnetizing field
• Permeability is a measure of the extent to which magnetic lines of force can penetrate a medium
• Permeability is a measure of conducting the magnetic lines of force in the material

Options are :

• sec^(2)?
• cos^(2)?
• tan^(2)?
• sin^(2)?

##### Pick up the correct statement from the following:

Options are :

• Water equivalent height of snow is the height of water column obtained by melting snow
• Spectral albedo of snow is calculated for the semi-infinite snow thickness
• The ratio of the up flux and down flux just above the snow surface, is called albedo
• A homogeneous snow pack is one whose average grain size does not vary with depth
• All of these

##### Pick up the correct statement from the following:

Options are :

• All of these
• When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed
• When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed
• When the electric vector is in the plane of incidence, vertical polarisation is formed
• The plane containing the incident ray and normal to the reflecting surface at the point of incidence is called the plane of incidence

##### Which one of the following errors is produced by platform characteristics of the sensor ?

Options are :

• All of these
• Orbit drift
• Altitude
• Altitude variation

##### Pick up the correct definition from the following with response to GIS:

Options are :

• The geometric property which describes the linkage between line features is defined as connectivity
• The area features which are wholly contained within another area feature, is known so containment
• Common boundry between two areas of a locality is known as adjacency
• All of these

##### The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as:

Options are :

• Ozone window
• Ozone hole
• Atmospheric window
• Black hole

##### Coherence of two electromagnetic waves takes place if their phase difference is:

Options are :

• Constant in time
• Constant in time and space
• Constant in space
• None of these

Answer :Constant in time and space

##### The value of energy quantum for radiation of any frequency is proportional to:

Options are :

• The frequency
• The square of the frequency
• The square root of the frequency
• The reciprocal of the energy

##### A reduction of nitrogen nutrient in plants:

Options are :

• Increase the visible reflectivity
• Reduces pigment concentration
• All of these
• Affects leaf colour

##### The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface, are called:

Options are :

• Passive sensors
• None of these
• Sensonrs
• Active sensors

##### A and B are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct ?

Options are :

• Height displacement of A will be less than that of B
• Height displacement of A and B is equal
• Height displacement of B will be less than that of A
• Height displacement of A and B will be towards each other

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

Options are :

• ?/4
• 3?/2
• ?
• ?/2

##### Which one of the following frequency regions is a part of sun's radiation ?

Options are :

• All of these
• Visible frequency region
• Ultraviolet frequency region
• Infrared frequency region

##### Which one of the following statements is correct ?

Options are :

• During the day, earth reflects solar radiation
• During the day earth reflects both solar radiation the emission from its surface
• All of these
• During the night, earth emits radiation from its surface

##### Pick up the important characteristic of a target which facilitates its identification from the following:

Options are :

• All of these
• Spatial variation
• Polarisation variation
• Spectral variation
• Temporal variation