Q. If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference toi) altitude bubble on index frameii) altitude bubble on index frame if it is to be used as a leveliii) altitude bubble on telescopeiv) altitude bubble on telescope if it is to be used as a level The correct answer is (Solved)
1. only (i)
2. both (i) and (iv)
3. only (iii)
4. both (ii) and (iii)
- b. both (i) and (iv)