# 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?
Height displacement of A will be less than that of B
Height displacement of B will be less than that of A
Height displacement of A and B is equal
Height displacement of A and B will be towards each other
Explanation:
No answer description is available. Let's discuss.

32.
Remote sensing techniques makes use of the properties of-----emitted, reflected or diffracted by the sensed objects:
electric waves
soundwaves
electromagnetic waves
wind waves
Explanation:
No answer description is available. Let's discuss.

33.
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
Explanation:
No answer description is available. Let's discuss.

34.
The most widely used antenna in GPS is
Parabolid antenna
Microstrip antenna
Horn antenna
Slotted antenna