GATE 2019 Surveying Quiz 6

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Question 1

Optimal flight planning for a photogrammetric survey should be carried out considering

• Aonly side-lap
• Bonly end-lap
• Ceither side-lap or end-lap
• Dboth side-lap as well as end-lap

Question 2

The plan of a map was photo copied to a reduced size such that a line originally 100mm, measures 90mm. The original scale of the plan was 1:1000. The revised scale is

• A1:900
• B1:1111
• C1:1121
• D1:1221

Question 3

The plans of a survey plotted to a scale of 10 m to 1 cm are reduced in such a way that a line originally 10 cm long now measures 9 cm. The area of the reduced plan is measured as 81 cm³. The actual area (m²) of the survey is

• A10000
• B6561
• C1000
• D656

Question 4

Two ships are moving towards a port in a line. The observer at Ship A is able to see the base of 49 m high light house and the observer at Ship B is able to see the head of the observer at Ship A. The height of light house that is visible to observer at Ship B is __________ m.
[Take height of the observer's eye/head above mean sea level on both ships to be 9 m]

• A13
• B14
• C15
• D16

Question 5

The distance from the principal point to an image on a photograph is 6.44 cm and the elevation of the object above the datum (sea level) is 250 m. The relief displacement of a point if the datum scale is and focal length of the camera is 30 cm is

• A0.209 cm
• B0.215 cm
• C0.224 cm
• D0.231 cm

Question 6

In a pair of overlapping photographs, the mean distance between two principal points both of which lie on the datum is 6.375 cm. at the time of photography, the air craft was 600 m above the datum. The camera has a focal length of 150 mm. in the common overlap a tall chimney 120 m high with its base in the datum surface is observed. Determine the difference of parallax for top and bottom of chimney.

• A16 mm
• B18 mm
• C20 mm
• D14 mm

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