MCL Exam MCQ 2026 - Part 04 | Junior Overman / Mining Sirdar / Surveyor Preparation | Indian Minerology

MCL Exam MCQ 2026 - Part 04
(Explosives, Blasting & Shotfiring)

Junior Overman / Mining Sirdar / Surveyor Preparation – Mahanadi Coalfields Limited Recruitment 2026

20 objective questions based on CMR 2017 Chapter XIV (Explosives & Shotfiring) and standard mining practices. Click "Show Answer" to reveal the correct option.

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Q41. As per CMR 2017, which type of explosives are permitted in underground coal mines?

A) Only loose explosives

B) Only cartridge form (except detonators)

C) Any form approved by owner

D) Only slurry explosives

Correct Answer: B) Only cartridge form (except detonators) – Reg. 183(2)

Q42. In fire areas underground, which explosives shall NOT be used as per CMR 2017?

A) Emulsion explosives

B) Any explosive other than slurry or emulsion

C) Detonating fuse

D) Ordinary detonators

Correct Answer: B) Any explosive other than slurry or emulsion

Q43. Who is responsible for issuing explosives to shotfirers?

A) Manager only

B) Competent person on written requisition signed by shotfirer

C) Overman

D) Surveyor

Correct Answer: B) Competent person on written requisition signed by shotfirer or authorised official

Q44. A shotfirer must hold which certificate(s) in belowground gassy mines?

A) Manager’s or Overman’s or Sirdar’s + Gas Testing Certificate

B) Only Sirdar’s Certificate

C) Blaster’s Certificate only

D) Surveyor’s Certificate

Correct Answer: A) Manager’s or Overman’s or Sirdar’s Certificate together with Gas Testing Certificate

Q45. In Degree II or III gassy seams, the maximum shots a shotfirer can fire per shift with multi-shot exploder is?

A) 40

B) 80

C) 100

D) 120

Correct Answer: B) 80 (for gassy seams Degree II/III with multi-shot exploder)

Q46. What is a 'misfire' as defined in CMR 2017?

A) Successful blast

B) Failure of entire charge to explode in hole

C) Overbreak

D) Flyrock

Correct Answer: B) Failure to explode of an entire charge of explosives in a shot hole or blast

Q47. Preparation of charges and charging of holes shall be done under whose personal supervision?

A) Manager

B) Shotfirer

C) Overman

D) Any workman

Correct Answer: B) Shotfirer – Reg. 190

Q48. In opencast mines, maximum shots per shift with multi-shot exploder is?

A) 60

B) 80

C) 100

D) 120

Correct Answer: D) 120

Q49. Blasting in underground coal mines shall be done with?

A) Ordinary detonators only

B) Approved explosives and electric detonators / exploders

C) Safety fuse only

D) Black powder

Correct Answer: B) Approved explosives and electric detonators / exploders (permitted / P1/P3/P5 types as applicable)

Q50. After a misfire in underground, what is the waiting period before approaching the hole?

A) 15 minutes

B) 30 minutes

C) No fixed time

D) 1 hour or as per site condition

Correct Answer: B) 30 minutes (standard practice; confirm with CMR guidelines on misfire handling)

Q51. Which regulation of CMR 2017 deals primarily with Explosives and Shotfiring?

A) Chapter X

B) Chapter XIV (Reg. 183–207)

C) Chapter XII

D) Chapter XVI

Correct Answer: B) Chapter XIV (Reg. 183–207)

Q52. In gassy mines, shotfiring operations require testing for inflammable gas by whom?

A) Manager

B) Shotfirer (with gas testing competency)

C) Surveyor

D) Any workman

Correct Answer: B) Shotfirer (with gas testing certificate)

Q53. Detonators shall be transported to working place in?

A) Open box

B) Special containers / locked boxes

C) Workman's pocket

D) Loose

Correct Answer: B) Special containers / locked boxes (secure transport)

Q54. The person who fires the shots is called?

A) Blaster

B) Shotfirer

C) Charger

D) Driller

Correct Answer: B) Shotfirer

Q55. As per CMR 2017, explosives shall be stored in?

A) Open area

B) Approved magazine / store

C) Underground working

D) Manager's office

Correct Answer: B) Approved magazine / store

Q56. In case of misfire, the shotfirer shall?

A) Ignore it

B) Report to official and handle as per procedure (no re-firing immediately)

C) Re-charge immediately

D) Blast again

Correct Answer: B) Report to official and handle as per procedure (no re-firing immediately)

Q57. Permitted explosives are classified as P1, P3, P5 based on?

A) Strength

B) Safety in gassy conditions (methane ignition delay)

C) Colour

D) Price

Correct Answer: B) Safety in gassy conditions (methane ignition delay)

Q58. Charging of holes in gassy mines requires checking methane level below?

A) 0.5%

B) 1.25%

C) 2%

D) No limit

Correct Answer: B) 1.25% (general body limit for safety; shotfiring stricter)

Q59. Who approves the pattern of blasting in mines?

A) Shotfirer

B) Manager / competent official

C) Workmen

D) DGMS directly

Correct Answer: B) Manager / competent official

Q60. In opencast deep hole blasting, special precautions are required under which regulation?

A) Reg. 183

B) Reg. 194 (deep hole provisions)

C) Reg. 154

D) Reg. 161

Correct Answer: B) Reg. 194 (deep hole provisions in CMR 2017)

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End of Part 04 (Explosives, Blasting & Shotfiring – 20 Questions)
Revise CMR Chapter XIV thoroughly. Best of luck for MCL 2026 CBT! ⛑️💪