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In case of railways,
Options:
A
.
 A detour round the hill is preferred
B
.
 A open cut is preferred
C
.
 Tunnelling is preferred
D
.
 All the above
Answer: Option C
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Question 1.
Which one of the following tunneling methods is used for laying underground sewers?....
Question 2.
In compressed air tunnelling, the volume of free air provided is....
Question 3.
High pressure grouting is generally restored for concreting in the lining if the rock strata is:....
Question 4.
The cut of a tunnel face is shown in given figure. This is called....
Question 5.
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Question 9.
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