500 Best Surveying MCQ
Q33). The limiting length of the offset is ……. When its perpendicular direction is set out by an eye.
a).5 m
b).10 m
c).15 m
d).20 m
Correct Answer:
15 m
Explanation:
Q34). The instrument used for setting out an offset at a right angle, is called
a).open cross-staff
b).french cross-staff
c).adjustable cross-staff
d).optical square
Correct Answer:
open cross-staff
Explanation:
Q35). The adjustable cross-staff is used for setting out an offset
a).at an angle of 45°
b).at an angle of 60°
c).at a right angle
d).at any angle
Correct Answer:
at any angle
Explanation:
Q36). An open cross-staff is commonly used for setting out
a).Short offsets
b).Long offsets
c).Oblique offsets
d).None of these
Correct Answer:
Long offsets
Explanation:
Q37). The angle of intersection of the horizon glass and index glass in an optical square is
a).30°
b).45°
c).60°
d).75°
Correct Answer:
45°
Explanation:
Q38). The horizon glass in an optical square is
a).wholly silvered
b).wholly unsilvered
c).one-fourth silvered and three-fourth unsilvered
d).half silvered and half unsilvered
Correct Answer:
half silvered and half unsilvered
Explanation:
Q39). The index glass in an optical square is
a).wholly silvered
b).wholly unsilvered
c).one-fourth silvered and three-fourth unsilvered
d).half silvered and half unsilvered
Correct Answer:
wholly silvered
Explanation:
Q40). The optical square is used to measure angles by
a).refraction
b).reflection
c).double refraction
d).double reflection
Correct Answer:
reflection
Explanation: