Surveying Multiple Choice Questions on “Introduction – Equipments for Plotting”.
1. Which of the following contains two plane mirrors or two right angles isosceles prisms placed one above the other?
a) Prism square
b) Line ranger
c) French staff
d) Optical square
Answer: b
Clarification: A line ranger consists of either two plane mirrors or two right angles isosceles prisms placed one above the other. The diagonals of the two prisms are silvered so as to reflect the incident rays.
2. Which of the following consists of two laths, each of 1 yard or 1m in length loosely riveted together?
a) Whites
b) Laths
c) Butt rod
d) Offset rods
Answer: c
Clarification: A Butt rod is used for measuring offsets, but it is often used by building surveyor or architects. It generally consists of two laths, each of 1 yard or 1m in length loosely riveted together.
3. Which of the following is not required for chain surveying?
a) 20 m chain
b) Arrows
c) Dumpy level
d) Pegs
Answer: c
Clarification: Dumpy level is used in levelling not in chain surveying. 20 m chain, arrows, pegs etc are mandatory for chain surveying.
4. Marking the survey stations in soft ground is done by _____
a) Nails
b) Spikes
c) Wooden pegs
d) Butt rods
Answer: c
Clarification: After having selected the survey stations, they should be marked to enable them to be easily discovered during the progress of the survey. In soft ground, wooden pegs may drive, leaving a small projection above the ground.
5. Which of the following is the sighting device?
a) Compass
b) Spirit level
c) Plumbing fork
d) Alidade
Answer: d
Clarification: Alidade is a sighting device and used for ordinary work. It generally consists of a metal or wooden rule with two vanes at the end.
6. Which of the following is not a sighting device?
a) Theodolite
b) Alidade
c) Dumpy level
d) Spirit level
Answer: d
Clarification: A small spirit level may be used for ascertaining if the table is properly level. It has a bubble that should be adjusted between the two lines provided exactly at centre.
7. Which of the following is used for the orientation of the table?
a) Compass
b) Spirit level
c) Dumpy level
d) Alidade
Answer: a
Clarification: The Compass is used for the orientation of a plane table. It is used to ensure that the table is oriented to magnetic north or not.
8. What is the size of the Johnson table?
a) 45 x 60 cm
b) 55 x 60 cm
c) 45 x 50 cm
d) 55 x 50 cm
Answer: a
Clarification: This consists of a drawing board 45 x 60 cm or 60 x 75 cm. The head consists of a ball and socket joint and a vertical spindle with two thumb screws on the underside.
9. What instrument is used for centering the table?
a) Compass
b) Spirit level
c) Plumbing fork
d) Alidade
Answer: c
Clarification: The Plumbing fork used in large scale work, is meant for centering the table over the point or station occupied by the plane table when the plotted position of that point is already known on the sheet.
10. Which of the following is the superior table?
a) Traverse table
b) Johnson table
c) Coast survey table
d) Plane table
Answer: c
Clarification: The coast survey table is the superior table. It is generally used for work of high precision.