💥 Blasting & Explosives MCQ Questions - Part 04
46. A “misfire” in blasting means:
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Answer: B. Failure of charge to detonate
47. Misfires must be handled after waiting for:
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Answer: B. 30 min
48. The “misfire report” must be submitted to:
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Answer: D. Both A and B
49. Most common environmental impact of blasting is:
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Answer: D. All of the above
50. Permitted maximum vibration level for residential area is:
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Answer: B. 25 mm/s
51. Damage to nearby buildings by blasting is mainly caused by:
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Answer: B. Excessive vibration
52. To minimize ground vibration, use:
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Answer: D. All of the above
53. “Flyrock” is prevented by:
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Answer: D. All of the above
54. DGMS requires blasting operations to be supervised by:
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Answer: B. Qualified Shotfirer
55. Maximum charge per delay (“MIC”) for controlling vibration is:
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Answer: D. Site-specific as per DGMS permission
56. Blasting should not be carried out during:
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Answer: B. Lightning/thunderstorm
57. “Blast mats” are used mainly for:
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Answer: B. Suppressing flyrock
58. Blasting log book must be signed by:
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Answer: D. Both A and C
59. Explosive storage magazine must be located at least:
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Answer: C. 180 m (from buildings)
60. Final responsibility for compliance with blasting safety rests with:
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Answer: C. Manager
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