Nevada Blaster Licensing Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum safe distance required when detonating a blast
in an open pit?
A. 50 feet
B. 100 feet
C. 150 feet
D. 200 feet
The minimum safe distance is set to 150 feet to ensure personnel are
out of harm’s way from flyrock and blast overpressure.
2. Which of the following is the primary purpose of a blast plan?
A. Reduce cost of explosives
B. Maximize fragmentation only
C. Ensure safety and regulatory compliance
D. Increase production speed
A blast plan outlines the sequence, placement, and safety measures
to protect workers and comply with state regulations.
3. What type of explosive is commonly used for controlled blasting in
quarries?
A. Black powder
B. Gunpowder
C. ANFO (Ammonium Nitrate Fuel Oil)
D. Nitroglycerin
ANFO is widely used due to its stability, cost-effectiveness, and
suitability for large-scale rock blasting.
,4. What is the primary hazard associated with misfires?
A. Dust inhalation
B. Noise
C. Unexploded charges posing detonation risk
D. Flyrock only
Misfires are hazardous because unexploded charges may detonate
unexpectedly during handling.
5. How should detonators be stored to maintain safety?
A. Near blasting caps
B. In a cool, dry, locked magazine separate from explosives
C. In open sunlight
D. Mixed with fuel sources
Detonators are highly sensitive and must be stored separately to
prevent accidental initiation.
6. Which of the following signals is standard before a blast?
A. Continuous horn
B. Three long blasts followed by one short blast
C. One short blast only
D. Visual flag wave
Standard signaling ensures all personnel are aware and cleared from
the blast area.
7. What is the maximum allowed overburden thickness for surface
blasting using ANFO?
A. 20 feet
B. 40 feet
C. 60 feet
D. 80 feet
Exceeding 60 feet may require more powerful explosives or
specialized blasting techniques.
8. Why is stemming important in a blast hole?
A. To reduce explosive cost
B. To confine explosive energy and improve fragmentation
C. To reduce noise only
D. To make drilling faster
, Stemming confines energy in the rock, ensuring better breakage and
minimizing flyrock.
9. Which factor has the greatest effect on flyrock distance?
A. Explosive type only
B. Blast design and stemming length
C. Weather conditions only
D. Time of day
Improper blast design or insufficient stemming can allow rock to be
propelled dangerously far.
10. What is the recommended method to deal with a misfire?
A. Detonate immediately
B. Wait a specified safe period, then follow state procedures for
misfires
C. Remove explosives by hand immediately
D. Ignore and continue blasting
Waiting ensures any delayed initiation does not harm personnel, and
state procedures provide safe handling steps.
11. What is the purpose of a blast mat?
A. Reduce dust
B. Improve fragmentation
C. Prevent flyrock from leaving the blast area
D. Reduce vibration only
Blast mats physically contain flying debris, protecting equipment and
personnel.
12. Which type of blasting is used to break rock without using
drilling holes?
A. Surface blast
B. Surface presplitting
C. Underground blast
D. Controlled charge detonation
Presplitting creates a fracture plane to control rock breakage along a
desired line.
13. What is the maximum time allowed between priming a hole and
initiation?
A. 1 hour
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum safe distance required when detonating a blast
in an open pit?
A. 50 feet
B. 100 feet
C. 150 feet
D. 200 feet
The minimum safe distance is set to 150 feet to ensure personnel are
out of harm’s way from flyrock and blast overpressure.
2. Which of the following is the primary purpose of a blast plan?
A. Reduce cost of explosives
B. Maximize fragmentation only
C. Ensure safety and regulatory compliance
D. Increase production speed
A blast plan outlines the sequence, placement, and safety measures
to protect workers and comply with state regulations.
3. What type of explosive is commonly used for controlled blasting in
quarries?
A. Black powder
B. Gunpowder
C. ANFO (Ammonium Nitrate Fuel Oil)
D. Nitroglycerin
ANFO is widely used due to its stability, cost-effectiveness, and
suitability for large-scale rock blasting.
,4. What is the primary hazard associated with misfires?
A. Dust inhalation
B. Noise
C. Unexploded charges posing detonation risk
D. Flyrock only
Misfires are hazardous because unexploded charges may detonate
unexpectedly during handling.
5. How should detonators be stored to maintain safety?
A. Near blasting caps
B. In a cool, dry, locked magazine separate from explosives
C. In open sunlight
D. Mixed with fuel sources
Detonators are highly sensitive and must be stored separately to
prevent accidental initiation.
6. Which of the following signals is standard before a blast?
A. Continuous horn
B. Three long blasts followed by one short blast
C. One short blast only
D. Visual flag wave
Standard signaling ensures all personnel are aware and cleared from
the blast area.
7. What is the maximum allowed overburden thickness for surface
blasting using ANFO?
A. 20 feet
B. 40 feet
C. 60 feet
D. 80 feet
Exceeding 60 feet may require more powerful explosives or
specialized blasting techniques.
8. Why is stemming important in a blast hole?
A. To reduce explosive cost
B. To confine explosive energy and improve fragmentation
C. To reduce noise only
D. To make drilling faster
, Stemming confines energy in the rock, ensuring better breakage and
minimizing flyrock.
9. Which factor has the greatest effect on flyrock distance?
A. Explosive type only
B. Blast design and stemming length
C. Weather conditions only
D. Time of day
Improper blast design or insufficient stemming can allow rock to be
propelled dangerously far.
10. What is the recommended method to deal with a misfire?
A. Detonate immediately
B. Wait a specified safe period, then follow state procedures for
misfires
C. Remove explosives by hand immediately
D. Ignore and continue blasting
Waiting ensures any delayed initiation does not harm personnel, and
state procedures provide safe handling steps.
11. What is the purpose of a blast mat?
A. Reduce dust
B. Improve fragmentation
C. Prevent flyrock from leaving the blast area
D. Reduce vibration only
Blast mats physically contain flying debris, protecting equipment and
personnel.
12. Which type of blasting is used to break rock without using
drilling holes?
A. Surface blast
B. Surface presplitting
C. Underground blast
D. Controlled charge detonation
Presplitting creates a fracture plane to control rock breakage along a
desired line.
13. What is the maximum time allowed between priming a hole and
initiation?
A. 1 hour
