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Question 1. What is the primary purpose of blasting in mining and construction? A) To submerge underground structures B) To fragment rock and facilitate excavation or demolition C) To cool down hot rock formations D) To permanently stabilize unstable slopes Answer: B Explanation: Blasting is primarily used to fracture rock and soil efficiently, making excavation, quarrying, or demolition easier and more economical. Question 2. Which historical development significantly advanced blasting techniques in the 19th century? A) The invention of dynamite by Alfred Nobel
B) The introduction of electric lights C) The discovery of gunpowder D) The development of hydraulic drills Answer: A Explanation: Alfred Nobel's invention of dynamite in the 1860s revolutionized blasting by providing a safer, more effective explosive compared to black powder. Question 3. Which of the following is NOT a typical category of blasting operation? A) Quarrying B) Construction C) Demolition D) Painting
Question 5. Which element is most common in the chemical composition of modern explosives? A) Nitrogen B) Carbon C) Oxygen D) Hydrogen Answer: C Explanation: Many explosives, like TNT and dynamite, contain oxygen-rich compounds that facilitate rapid oxidation during detonation. Question 6. How does detonation differ from deflagration? A) Detonation is subsonic combustion, while deflagration is supersonic B) Detonation involves supersonic shock waves; deflagration is subsonic combustion
C) They are the same process with different names D) Detonation occurs only in gases; deflagration only in solids Answer: B Explanation: Detonation propagates as a supersonic shock wave, releasing energy rapidly, whereas deflagration is a subsonic combustion process. Question 7. Which factor increases the energy release during explosive detonation? A) Lower temperature confinement B) Higher confinement and pressure C) Decreased reaction rate D) Reduced oxygen availability Answer: B
Question 9. Which of the following is a water gel explosive? A) Dynamite B) Ammonium nitrate C) Emulsions with a gelling agent D) Fuel oil alone Answer: C Explanation: Water gels are emulsions stabilized with gelling agents, making them safer and more stable compared to traditional dynamite. Question 10. What is an important safety consideration when handling detonators? A) They can be stored with regular tools
B) They require minimal precautions C) They must be kept away from heat, static, and impact D) They are safe if kept in open air Answer: C Explanation: Detonators are sensitive devices that can be initiated by heat, static, or impact, so strict safety precautions are essential. Question 11. Which component is critical in an electric detonator system? A) Fuse B) Primer C) Electric detonator with a resistor and a firing circuit D) Shock tube Answer: C
A) Color B) Density and hardness C) Age of the rock formation D) Proximity to water sources Answer: B Explanation: Rock density and hardness affect how much explosive is needed and the pattern of blast design for effective fragmentation. Question 14. How do discontinuities like joints influence blasting? A) They increase the stability of the blast B) They facilitate fracture propagation and fragmentation C) They prevent any rock breakage D) They are irrelevant to blast design
Answer: B Explanation: Discontinuities such as joints and fractures guide the propagation of cracks, influencing fragmentation and blast efficiency. Question 15. What is the primary purpose of pre-blast surveys? A) To measure the weather conditions only B) To assess site conditions, hazards, and ensure safety measures are in place C) To determine the color of rocks D) To set up water supply lines Answer: B Explanation: Pre-blast surveys identify hazards, environmental sensitivities, and establish safe blast parameters.
C) Using boosters or primers to ensure reliable detonation initiation D) Igniting the entire column simultaneously with a match Answer: C Explanation: Boosters or primers are used to reliably initiate the main explosive charge. Question 18. Which is a safety feature of electronic detonators? A) They are unaffected by environmental conditions B) They include programmable delays and remote initiation controls C) They are only used in underwater blasting D) They do not require any testing before use Answer: B
Explanation: Electronic detonators offer precise timing and remote control features, enhancing safety and blast performance. Question 19. What is the primary benefit of delay timing in blasting? A) To increase vibration and flyrock B) To fragment the rock into larger pieces C) To control blast vibration and improve fragmentation D) To eliminate the need for safety measures Answer: C Explanation: Proper delay timing reduces ground vibration and improves fragmentation by sequencing the blast wave propagation. Question 20. Which regulation is primarily enforced by OSHA for blasting safety?
D) Storing them in the same room as heavy machinery Answer: B Explanation: Explosives must be stored in secure, properly designed magazines with controlled environments to prevent accidental initiation. Question 22. Which of the following is NOT a typical safety measure during blasting? A) Establishing a safe perimeter and warning signals B) Clearing the blast area of personnel C) Ignoring environmental conditions D) Conducting pre-blast safety inspections Answer: C Explanation: Ignoring environmental conditions can lead to accidents; safety measures require careful assessment of all hazards.
Question 23. How does blast vibration affect nearby structures? A) It causes permanent damage immediately B) It results in minor, harmless movement only C) It can cause damage if levels exceed acceptable limits, measured as particle velocity D) It has no effect on structures Answer: C Explanation: Excessive ground vibration can damage structures; measurements help ensure vibrations stay within safe limits. Question 24. Which parameter is most commonly monitored to assess blast- induced ground vibration? A) Air pressure
Answer: B Explanation: Proper delay patterns and scaled distance techniques help control and reduce air overpressure effects. Question 26. Which environmental aspect should be minimized during blasting to protect wildlife? A) Noise pollution B) Dust and sediment runoff C) Vibration levels D) All of the above Answer: D Explanation: Minimizing noise, dust, and vibration helps protect wildlife and sensitive habitats during blasting.
Question 27. Which document is essential for tracking explosives usage on a blasting site? A) Daily weather report B) Blast log and inventory records C) Employee attendance sheet D) Equipment maintenance schedule Answer: B Explanation: Blast logs and inventory records document explosive quantities used, ensuring regulatory compliance and safety. Question 28. When managing a misfire, what is the first step? A) Reinitiate the blast immediately B) Evacuate the area and assess hazards
