If aptitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to

(i) altitude bubble on index frame

(ii) altitude bubble on index frame if it is to be used as a level

(iii) altitude bubble on telescope

(iv) altitude bubble on telescope if it is to be used as a level

The correct answer is

- 1
  
  Only (i)
- 2
  
  Both (i) and (iv)
- 3
  
  Only (iii)
- 4
  
  Both (ii) and (iii)

Display Comments

Leave a comment

Login at first then you can submit comment. Click here to login.