Direct method of levelling is also known as
- Abarometric levelling
- Bhypsometric levelling
- Chydrographic levelling
- Dspirit levellingCorrect
Solution
Concept
Direct levelling
Step-by-step solution
1. Direct levelling with a level and staff is called spirit levelling.
Explanation
The bubble (spirit) tube is used to level the instrument.
Why the other options are wrong
Barometric and hypsometric are indirect methods.
Shortcut
Direct = spirit.
Correct answer: D) spirit levelling