Surveying

Q: The minimum range for sliding the focusing lens in the internal focusing telescope for focusing at all distances beyond 4 m is

(a) :  5 mm
(b) :  10 mm
(c) :  15mm
(d) :  20 mm
(e) :  None of these
Answer:  20mm
Explanation:  

Q: The longitudinal section of the surface of bubble tube is

(a) :  straight
(b) :  circular
(c) :  parabolic
(d) :  elliptic
(e) :  None of these
Answer:  circular
Explanation:  

Q: In an internal focusing telescope

(a) :  the objective is at a fixed distance from the diaphragm
(b) :  the focusing is done by the sliding of a divergent lens.
(c) :  the focusing is done by the sliding of a divergent lens.
(d) :  all the above.
(e) :  None of these
Answer:  all the above.
Explanation:  

Q: Imaginary line passing through points having equal magnetic declination is termed as

(a) :  isogon
(b) :  agonic line
(c) :  isoclinic line
(d) :  all of these.
(e) :  None of these
Answer:  isogon
Explanation:  

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