"An Electromagnetic wave falls on to a boundary between two losses 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:
Fresnel reflection
Fresnel refraction
Snell's law
None of these
Q.2.
Crop Acreage and Production Estimation (CAPE) was funded and taken up inby:
USA
European Union
Russia
India
Q.3.
Which one of the following statement is correct?
Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
The rate of transfer of radiant energy is called flux and is expressed in watts
The radiant energy which falls upon a surface is termed as irradiance
All of these
Q.4.
The coherence length over which there is a strong relationship between amplitudes is;
Directly proportional to the bandwidth
Inversely proportional to the bandwidth
The square of the bandwidth
None of these
Q.5.
A perfectly black body:
Is a diffuse emitter
Absorbs all the radiations of every wave lengths
Emits power of every wave length
All the above
Q.6.
Which one of the following parameters is considered to determine the reflectance of a vegetation canopy?
Solar zenith angle
Azimuth angle
Look angle
All of these
Q.7.
Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:
Electric waves
Sound waves
Electromagnetic waves
Wind waves
Q.8.
For C band Synthetic Aperture Radar (SAR) with Doppler band width ofHz, the coherence length loch is:
130 km
230 km
250 km
500 km
Q.9.
Which one of the following statements is correct regarding the GPS satellites?
The nominal altitude is about 20,200 km
The inclination of axis satellite is 55°
The satellite transmits two L band signals (L1 with 1575.42 MHz and L2 with 1276.6 MHz)
All of these
Q.10.
If electric permittivity and magnetic permeability of the medium are respectively ‘ε’ and ‘μ’, then the velocity (Cm) of the electromagnetic wave in the medium is given by:
Cm = 1/εμ
Cm = 1/√8 μ
Cm = 5/√εμ
None of these
Q.11.
Which one of the following errors is produced by platform characteristics of the sensor?
Altitude variation
Altitude
Orbit drift
All of these
Q.12.
Which one of the following parameters is accurate for DGPS?
Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
Positional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station
Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station
Positional accuracies ~ 5 - 10 m if rover is less than 25 km
Q.13.
The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called:
Reflectance
Reflectance factor
Albedo
None of these
Q.14.
The most widely used antenna in GPS is
Parabolic antenna
Microstrip antenna
Horn antenna
Slotted antenna
Q.15.
Who coined the term, ‘Remote sensing’.
Evelyn L. Pruitt, a geographer
Gaspard Felix Tournachon, a French scientist
Wilbur Wright, an Italian scientist
None of these
Q.16.
According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on another medium (refractive index m₂);
The angle of incidence is equal to the angle of refraction
The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi
Both (A) and (B)
Neither (A) nor (B)
Q.17.
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its
Six ground stations
Five ground stations
Four ground stations
Three ground stations
Q.18.
The normal altitude of GPS satellite is about
16,200 km
20,200 km
24,400 km
36,100 km
Q.19.
Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).
h > λ/Δ cos θ
h = λ/8 cos θ
h > λ/8 cos θ
h
Q.20.
The changes in the reflectivity/emissivity with time, is called:
Spectral variation
Spatial variation
Temporal variation
None of these
Q.21.
The refractive index of the ocean water:
Increases with salinity
Increases with temperature
Decreases with salinity
Decreases with temperature
Q.22.
Pick up the correct definition from the following with response to GIS.
Common boundary between two areas of a locality is known as adjacency
The area features which are wholly contained within another area feature, is known so containment
The geometric property which describes the linkage between line features is defined as connectivity
All of these
Q.23.
The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,
Reduces the contrast of the image and also its sharpness
Increases the contrast of the image but reduces the sharpness
Increases both the contrast and sharpness
Reduces the contrast but increases the sharpness
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