To attain the required shape of the tunnel section, we use:

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