Q. When can the rocks act as a natural arch?

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Q. Layers dipping at angles up to 45° may be called __________

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Q. Which type of strata is rare in occurrence?

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Q. Which type of rocks requires double lining, i.e., temporary and permanent lining?

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Q. Pick the rock considered as soft rocks for tunnelling.

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Q. What occurs due to falling of big rock blocks or sides due to release of stresses during tunnelling?

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Q. Lithology does not affect which parameter?

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Q. Which outline is preferred for weak rocks with unequal lateral pressure?

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Q. Selection of excavation method depends on __________

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Q. Traffic tunnels are always constructed for kilometres.

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Q. Geologically, how many classes of tunnels are recognized?

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Q. Method of placing tubes in public utility tunnels is called __________

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Q. Subway and tube railways are studied under which type of tunnels?

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Q. Underground excavations for carrying pipes, sewage etc. fall under which type?

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Q. Type of hydropower tunnel where water is conveyed under high pressure to turbines is __________

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Q. Type of hydropower tunnel where water is conveyed under gravity is __________

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Q. Tunnels associated with hydropower generation are called __________

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Q. Pick the tunnel which is not a sub-group of traffic tunnels.

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Q. Type of tunnels which are excavated to divert the traffic load of whatsoever type from surface to subsurface routes.

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Q. The underground routes or passages driven through the ground without disturbing overlying soil cover are called __________

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