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Surveying

Surveying
In an internal focussing type of telescope, the lens provided is

convex
concave
plano-concave
plano-convex

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Surveying
The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

B = b/fH
B =f/bH
B = bH/f
B = H/bf

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Surveying
The altitudes of a circumpolar star at culminations are 70° and 10°, both culminations being north of zenith. The declination of the star, is

80°
70°
60°
50°

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Surveying
For a well-conditioned triangle, no angle should be less than

60°
20°
45°
30°

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Surveying
Which of the following is not used in measuring perpendicular offsets ?

steel tape
optical square
cross staff
line ranger

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Surveying
Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel

0.6
0.24
0.36
0.4

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