Online Civil Engineering Test - Elements of Remote Sensing Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as:

ozone hole

atmospheric window

ozone window

black hole

[#]

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

0.4 to 1.3, 1.5 to 1.8, 2.2 to 2.6 μm

2.2 to 2.6, 3.0 to 3.6, 4.2 to 5.0 μm

4.2 to 5.0, 7.0 to 15.0 μm and 1 cm to 30 cm

All of these

[#]

The arrangement of terrain features which provides attributes: the shape, size and texture of objects, is called :

spectral variation

spatial variation

temporal variation

None of these .

[#]

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

[#]

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

altitude variation

altitude

orbit drift

All of these

[#]

Due to pertubation 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

[#]

The various stages occuring in GPS system are described below :
1. Generation of an output to the user
2. Detection of the GPS signal
3. Processing the data in the built-in-computer
4. Decoding the GPS signal.
The correct sequence of the stages is :

1, 2, 3, 4

2, 3, 4, 1

2, 4, 3, 1

3, 1, 2 , 4

[#]

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 - 5m if rover is less than 2-5 fm 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

[#]

The reflectance from a surface is called specular reflection if it follows: .

Snells's law

Lambert's cosine law

Planktan's law

All of these

[#]

10.

The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:

passive remote sensing

active remote sensing

neutral remote sensing

None of these

[#]

11.

While propagating through homogeneous, isotropic media,

directions of both the fields are orthogonal

both the fields are at right angles to the direction of propagation.

both (a) and (b)

niether (a) nor (b)

[#]

12.

According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on an other medium (refractive index m₂);

the angle of incidence is equal to the angle of refraction

the angle of refraction (θr) is given by

Both (a) and (b)

neither (a) nor (b)

[#]

13.

Which one of the following geometric errors of satellite sensors is random ?

scan skew

panoramic distortion

earth rotation

altitude variation

[#]

14.

The GPS space segment consists of Navigation Satellite Timing and Ranging whose number is :

[#]

15.

The code based GPS receivers are generally used for:

Vehicle tracking

Land navigation

Trans movement

All of these

[#]

16.

The maximum absorption of solar radiation due to ozone occurs at wave lengths:

shorter than 0.3 μm

shorter than 0.2 μm

greater than 0.3 μm

None of these

[#]

17.

Snow albedo is affected by :

wave length

grain size

solar zenith angle

snow pack thickness

All of these

[#]

18.

In sun-light water poor in phyto plank tons appears :

deep blue

red

green

yellow

[#]

19.

Pick up the correct statement from the following:

Water molecules and salt-ions in the ocean scatter the lower wave length more

An increase in the back scattering coefficient with shorter wave length gives a deep blue colour for clear oceanic water

The ratio of the upwelling irradiance just below the surface and downwelling irradiance just above the surface is called reflectance ratio.

All of these

[#]

20.

Which one of the following statements is correct ?

Each satellite of the GPS system transmits two L band signals.

The two L band signals are modulated by the Pseudorandom binary codes (PN).

The GPS receiver reads the specific code of the satellite.

The PN code determines the time taken by the receiver to reach the receiver which is converted into distance

All of these

[#]

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Online Civil Engineering Test - Elements of Remote Sensing Test

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