💥 Blasting & Explosives MCQ Questions - Part 03
31. The term “burden” in blasting refers to:
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Answer: B. Distance between row of holes and free face
32. “Spacing” in a blast pattern means:
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Answer: B. Distance between adjacent holes in a row
33. V-Pattern (or “chevron”) blasting is effective for:
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Answer: B. Tunnels/headings
34. Staggered blast pattern helps to:
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Answer: D. Both B and C
35. In “millisecond delay” blasting, the delay between two delays is about:
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Answer: B. 10–50 ms
36. Sequential firing (delay pattern) in blasting is used to:
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Answer: D. All of the above
37. In tunnel blasting, the cut holes are generally charged:
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Answer: B. Most
38. The performance of a blast is best assessed by:
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Answer: C. Degree of fragmentation
39. Deck charging is practiced to:
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Answer: B. Control vibration and fly rock
40. Maximum charge per delay (“maximum instantaneous charge”) influences:
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Answer: A. Ground vibration amplitude
41. Electronic initiation systems are superior because:
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Answer: D. All of the above
42. Column charge in a blast hole refers to:
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Answer: B. Explosive loaded above bottom charge up to stemming
43. Air decking in blasting means:
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Answer: B. Introducing air gap within charge column
44. The most important pre-blast safety step is:
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Answer: A. Checking connections & earthing
45. The function of stemming in a blast hole is to:
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Answer: B. Confine detonation gases for better breakage
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