WorksheetsChain Survey - Part 3
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Which surveying instrument is used mainly for setting out right angles on the ground?
a)
Optical square
b)
Clinometer
c)
Dumpy level
d)
Abney level
2.
The optical square works on which fundamental principle?
a)
Double refraction
b)
Double reflection
c)
Parallax correction
d)
Total internal reflection
3.
The two mirrors in an optical square are inclined at:
a)
30°
b)
45°
c)
60°
d)
90°
4.
Which mirror in an optical square is half silvered?
a)
Index mirror
b)
Horizon mirror
c)
Both mirrors
d)
Neither mirror
5.
The final angle between index sight and horizon sight in an optical square is:
a)
45°
b)
60°
c)
90°
d)
120°
6.
Which of the following is a more accurate and modern version of the optical square?
a)
Ranging rod
b)
Prism square
c)
Surveyor compass
d)
Cross staff
7.
What is the typical diameter of an optical square?
a)
10–20 mm
b)
25–35 mm
c)
50–65 mm
d)
100–120 mm
8.
Which mirror in an optical square is fully silvered?
a)
Index mirror
b)
Horizon mirror
c)
Both mirrors
d)
None
9.
Optical square is primarily used for:
a)
Fore bearings
b)
Back bearings
c)
Perpendicular offsets
d)
Contour interval measurement
10.
Identify the correct internal angle in the optical square.
a)
Index sight to horizon sight = 105°
b)
Horizon sight to horizon mirror = 120°
c)
Index mirror to horizon mirror = 90°
d)
Index sight to index mirror = 150°
100 %
