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| Q. |
Which of the following can act as an alternative for blasting? |
| A. | tunneling |
| B. | continuous blasting |
| C. | sequential blasting |
| D. | fire-setting |
| Answer» D. fire-setting | |
| Explanation: blasting is the conventional method which is adopted in case of rock tunneling. in the case of fire-setting, tunnel is heated with fire and then cooled with water. rapid expansion and contraction weakens and rock and tends to break. | |
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