Blasting & Explosives MCQ Questions - Part 01 | Indian Minerology

💥 Blasting & Explosives MCQ Questions - Part 01

1. The primary purpose of blasting in mines is:

• A. To ventilate mine
• B. To break rock/coal
• C. To drain water
• D. To cool air

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Answer: B. To break rock/coal

2. The velocity of detonation (VOD) of permitted explosives is usually:

• A. 1000–1500 m/s
• B. 2000–4000 m/s
• C. 5000–7000 m/s
• D. Above 8000 m/s

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Answer: B. 2000–4000 m/s

3. The main oxidiser used in ANFO explosive is:

• A. Sodium nitrate
• B. Ammonium nitrate
• C. Potassium chlorate
• D. Calcium nitrate

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Answer: B. Ammonium nitrate

4. Detonating fuse generally contains:

• A. TNT core
• B. PETN core
• C. Gunpowder core
• D. ANFO core

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Answer: B. PETN core

5. Electric detonators work by:

• A. Flame heating
• B. Electric current heating bridge wire
• C. Manual striking
• D. Gas pressure

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Answer: B. Electric current heating bridge wire

6. Water-gel explosives are:

• A. Permitted explosives only
• B. Mixtures of ammonium nitrate, sensitizers and water
• C. Only used in open cast mines
• D. Nuclear explosives

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Answer: B. Mixtures of ammonium nitrate, sensitizers and water

7. Permitted explosives are used in fiery seams because:

• A. Low cost
• B. Reduced flame and temperature
• C. Easily available
• D. Produce more fumes

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Answer: B. Reduced flame and temperature

8. Explosives should be stored in:

• A. Open yard
• B. Approved licensed magazine
• C. Wooden hut
• D. Office rooms

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Answer: B. Approved licensed magazine

9. The common test for determining explosive strength is:

• A. Gallery test
• B. Cage test
• C. Trauzl lead block test
• D. Drop ball test

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Answer: C. Trauzl lead block test

10. Explosives Act in India was first enacted in:

• A. 1884
• B. 1905
• C. 1942
• D. 1952

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Answer: A. 1884

11. When temperature increases, explosive sensitivity:

• A. Increases
• B. Decreases
• C. Remains same
• D. Becomes zero

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Answer: A. Increases

12. Which one is a low explosive?

• A. Dynamite
• B. Gunpowder
• C. ANFO
• D. PETN

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Answer: B. Gunpowder

13. Explosives are classified as “Class 1” under Indian Explosives Rules for:

• A. Fireworks
• B. Gunpowder & nitro-compounds
• C. Fuse
• D. Matches

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Answer: B. Gunpowder & nitro-compounds

14. A proper stemming material in blasting is:

• A. Wood chips
• B. Sand/dust
• C. Coal dust
• D. Oil-soaked waste

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Answer: B. Sand/dust

15. Blasting in fiery seams without permitted explosives is:

• A. Allowed by written permission
• B. Prohibited under law
• C. Safe
• D. Normal practice

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Answer: B. Prohibited under law

💥 Blasting & Explosives MCQ Series

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