The following operations are generally employed for tunnelling in hard rock.
1.Removing ground water,
2.Loading holes and firing the explosive
3.Setting up and drilling
4.Grouting and lining
5.Removing muck
6.Ventilation and removing explosion dust
The correct sequence is:

A. (i) and (ii) are correct B. (iii) and (iv) are correct C. (i) and (iv) are correct D. (ii) and (iii) are correct

A. Stone masonry B. Timber C. Cast iron D. Cement concrete

A. Army method B. Needle beam method C. Austrian method D. English method

A. Only up holes B. Only down holes C. Horizontal or up holes D. Horizontal down or up holes