Civil Engineering - Elements of Remote Sensing

Exercise :: Elements of Remote Sensing - Section 1

31. 

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?

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

Answer: Option A

Explanation:

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32. 

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

A. electric waves
B. soundwaves
C. electromagnetic waves
D. wind waves

Answer: Option C

Explanation:

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33. 

Which one of the following parameters is accurate for DGPS.

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

Answer: Option A

Explanation:

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34. 

The most widely used antenna in GPS is

A. Parabolid antenna
B. Microstrip antenna
C. Horn antenna
D. Slotted antenna

Answer: Option B

Explanation:

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35. 

Which one of the following statements regarding remote sensing is correct.

A. The interaction of the electromagnetic radiation with the target
B. The emission of electromagnetic radiation from the target
C. both (a) and (b)
D. Neither (a) nor (b)

Answer: Option C

Explanation:

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