Tunnelling Multiple Choice Questions and Answers

1. First tunnel built in the world was in Babylon, in the year

1. 2000 BC
2. 200 BC
3. 200 AD
4. 600 AD

2. Diverting water entering tunnel is

1. predrainage work
2. permanent drainage work
3. drainage work during construction
4. all the above

3. Drift method of tunnelling is used to construct tunnel in

1. soft ground
2. running ground
3. rocks
4. broken grounds

4. For mucking the method employed is

1. hauling on rails
2. hauling on pneumatic tyres
3. using conveyers
4. all the above

5. In case of tunnels in hilly areas to align tunnel ends use

1. direst ranging
2. reciprocal ranging
3. triangulation
4. any one of the above

6. In tunnel, unless special provision is made for proper drainage, the gradient should not be more than

1. 5%
2. 7%
3. 10%
4. 12%

7. Mechanical ventilation method used in tunnels consists of

1. blowing fresh air
2. providing exhaust air by ducts
3. both a and b
4. none of the above

8. Pack grouting with concrete is required between

1. rock and concrete lining
2. steel lining and concrete lining
3. both a and b
4. none of the above

9. The drilling pattern in which 3 to 4 converging holes are so directed that they meet at point further is known as

1. fan cut
2. pyramid cut
3. V-cut
4. burn cut

10. The explosive recommended for blasting a soft rock is

1. blasting gelatine
2. special gelatine 9 to 40%
3. ammonia dynamite
4. semi-gelatine