1. How many chief types of levels are used in levelling?
2. A levelling staff is used to establish:
Correct Answer is : Horizontal line of sight
3. Dumpy level was originally designed by:
Correct Answer is : Gravatt
4. How many categories of levelling staff are there?
5. Which of the below is used to make a line of sight horizontally in a level?
Correct Answer is : Foot screws