AK BLASTING CONTRACTOR EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary objective of a blasting operation?
A. Maximize explosive consumption
B. Produce the required rock fragmentation safely and
efficiently
C. Eliminate the need for excavation equipment
D. Create maximum ground vibration
Answer: B. Produce the required rock fragmentation safely
and efficiently
Rationale: A properly designed blast balances fragmentation,
movement, safety, cost, and environmental effects.
2. Which factor is most important before beginning any
blasting work?
A. Selecting the largest available explosive
B. Establishing a safe blasting plan
C. Increasing drilling speed
D. Removing all excavation equipment
,Answer: B. Establishing a safe blasting plan
Rationale: Planning identifies hazards, establishes controls, and
coordinates the blasting operation.
3. What does an explosive generally require to initiate a
chemical reaction?
A. Appropriate initiation energy
B. Water only
C. Compressed air only
D. Sunlight
Answer: A. Appropriate initiation energy
Rationale: Explosives are designed to react when subjected to
suitable initiation conditions.
4. Which characteristic distinguishes a high explosive from a
typical blasting agent?
A. It cannot produce gas
B. It normally has a much higher detonation velocity
C. It cannot be initiated
D. It contains no chemical energy
Answer: B. It normally has a much higher detonation velocity
Rationale: High explosives generally undergo detonation at
much higher velocities than conventional blasting agents.
,5. What is stemming used for in a blast hole?
A. To cool the explosive
B. To confine explosive gases and energy
C. To lubricate the drill bit
D. To measure hole depth
Answer: B. To confine explosive gases and energy
Rationale: Proper stemming helps retain energy in the rock and
reduces uncontrolled venting.
6. What is burden in blast design?
A. Distance from a blast hole to the nearest free face
B. Total explosive weight
C. Drill-hole diameter
D. Hole depth only
Answer: A. Distance from a blast hole to the nearest free face
Rationale: Burden is a fundamental geometric parameter
affecting fragmentation and blast movement.
7. What is spacing?
A. Distance between adjacent blast holes in a row
B. Distance from the blast to a building
C. Length of stemming
D. Explosive density
, Answer: A. Distance between adjacent blast holes in a row
Rationale: Spacing describes the distance between neighboring
holes and is part of blast geometry.
8. Why is drilling accuracy important in blasting?
A. It eliminates the need for explosives
B. It helps maintain the designed blast geometry
C. It guarantees zero vibration
D. It prevents all noise
Answer: B. It helps maintain the designed blast geometry
Rationale: Incorrect hole location, angle, or depth can
significantly change blast performance.
9. What is flyrock?
A. Dust produced during drilling
B. Rock fragments projected beyond the intended blast area
C. Water entering a blast hole
D. Explosive residue
Answer: B. Rock fragments projected beyond the intended
blast area
Rationale: Flyrock is a major blasting hazard and requires
effective exclusion zones and blast controls.
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary objective of a blasting operation?
A. Maximize explosive consumption
B. Produce the required rock fragmentation safely and
efficiently
C. Eliminate the need for excavation equipment
D. Create maximum ground vibration
Answer: B. Produce the required rock fragmentation safely
and efficiently
Rationale: A properly designed blast balances fragmentation,
movement, safety, cost, and environmental effects.
2. Which factor is most important before beginning any
blasting work?
A. Selecting the largest available explosive
B. Establishing a safe blasting plan
C. Increasing drilling speed
D. Removing all excavation equipment
,Answer: B. Establishing a safe blasting plan
Rationale: Planning identifies hazards, establishes controls, and
coordinates the blasting operation.
3. What does an explosive generally require to initiate a
chemical reaction?
A. Appropriate initiation energy
B. Water only
C. Compressed air only
D. Sunlight
Answer: A. Appropriate initiation energy
Rationale: Explosives are designed to react when subjected to
suitable initiation conditions.
4. Which characteristic distinguishes a high explosive from a
typical blasting agent?
A. It cannot produce gas
B. It normally has a much higher detonation velocity
C. It cannot be initiated
D. It contains no chemical energy
Answer: B. It normally has a much higher detonation velocity
Rationale: High explosives generally undergo detonation at
much higher velocities than conventional blasting agents.
,5. What is stemming used for in a blast hole?
A. To cool the explosive
B. To confine explosive gases and energy
C. To lubricate the drill bit
D. To measure hole depth
Answer: B. To confine explosive gases and energy
Rationale: Proper stemming helps retain energy in the rock and
reduces uncontrolled venting.
6. What is burden in blast design?
A. Distance from a blast hole to the nearest free face
B. Total explosive weight
C. Drill-hole diameter
D. Hole depth only
Answer: A. Distance from a blast hole to the nearest free face
Rationale: Burden is a fundamental geometric parameter
affecting fragmentation and blast movement.
7. What is spacing?
A. Distance between adjacent blast holes in a row
B. Distance from the blast to a building
C. Length of stemming
D. Explosive density
, Answer: A. Distance between adjacent blast holes in a row
Rationale: Spacing describes the distance between neighboring
holes and is part of blast geometry.
8. Why is drilling accuracy important in blasting?
A. It eliminates the need for explosives
B. It helps maintain the designed blast geometry
C. It guarantees zero vibration
D. It prevents all noise
Answer: B. It helps maintain the designed blast geometry
Rationale: Incorrect hole location, angle, or depth can
significantly change blast performance.
9. What is flyrock?
A. Dust produced during drilling
B. Rock fragments projected beyond the intended blast area
C. Water entering a blast hole
D. Explosive residue
Answer: B. Rock fragments projected beyond the intended
blast area
Rationale: Flyrock is a major blasting hazard and requires
effective exclusion zones and blast controls.
