The most widely used antenna in GPS is Parabolid antenna Microstrip antenna Horn

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Microstrip antenna

Elements of Remote Sensing problems

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1. Pick up the correct statement from the following :
Options
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

2. Pick up the correct statement from the following:
Options
A. Phase of a wave is expressed as a fraction of a period with respect to a refrence
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

3. Which one of the following statements is correct?
Options
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

4. 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 :
Options
A. 1, 2, 3, 4
B. 2, 3, 4, 1
C. 2, 4, 3, 1
D. 3, 1, 2 , 4

5. Which one of the following parameters is accurate for DGPS.
Options
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

6. Which one of the following statements is correct?
Options
A. During the day, earth reflects solar radiation
B. During the day earth reflects both solar radiation the emission from its surface
C. During the night, earth emits radiation from its surface
D. All of these

7. "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
A. Fresnel reflection
B. Fresnel refraction
C. Snell's law
D. None of these

8. The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,
Options
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

10. Pick up the correct statement from the following:
Options
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

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