DGMS Metal Restricted June 2025 Exam PYQ
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DGMS Metal First Class Legislation – Memory-Based Questions (June 2025) Candidates who appeared for the DGMS First Class Manager (Metal) Legislation Exam (June 2025) shared memory-based questions. Based on those inputs, we have framed 25 important MCQs with answers and solutions. These cover Mines Act, Safety Standards, Environment, Blasting, ERP, and Geotechnical aspects that were highlighted in the actual exam.

Q1. Safety helmets for mine workers in India must comply with which BIS standard?

A) IS 3833

B) IS 4770

C) IS 2925

D) IS 6509

E) IS 4567

Answer: C – IS 2925
Solution: IS 2925 specifies performance requirements for industrial safety helmets used in mining and construction.

Q2. Under which condition can women be employed in mines?

A) Underground at night shifts

B) Above ground in day shifts as notified

C) Underground with prior DGMS permission for rescue

D) In any mine without restriction

E) None of the above

Answer: B – Above ground in day shifts as notified
Solution: Mines Act prohibits underground work for women except emergencies, and allows only notified day hours above ground.

Q3. For which type of projects is Environmental Impact Assessment (EIA) not required?

A) Category A projects

B) Category B1 projects

C) Category B2 projects (small mining leases below threshold)

D) All mining projects require EIA

E) Projects in forest areas

Answer: C – Category B2 projects
Solution: Category B2 projects (small scale) are exempt from detailed EIA under MoEFCC notification.

Q4. Critical density of an explosive refers to:

A) Density for storage safety

B) Minimum density required for detonation to propagate

C) Density giving maximum fragmentation

D) Density at which explosive becomes unstable

E) Density required for waterproofing

Answer: B – Minimum density required for detonation
Solution: Below critical density, detonation cannot sustain → misfires.

Q5. What is the major disadvantage of operating explosives near critical density?

A) Increased flyrock

B) Reduced VOD, incomplete detonation

C) Overcharging

D) Excess fumes only

E) Higher cost

Answer: B – Reduced VOD, incomplete detonation
Solution: Near critical density, detonation velocity decreases, leading to misfires and toxic fumes.

Q6. Sludge treatment completely eliminates all hazards. True or False?

A) True

B) False

C) True in large mines

D) True if incinerated

E) None

Answer: B – False
Solution: Sludge treatment reduces hazards but does not eliminate them entirely; disposal precautions are still required.

Q7. Which ratio correctly represents the Factor of Safety (FoS)?

A) Stress ÷ Strength

B) Strength ÷ Stress

C) Load ÷ Resistance

D) Resistance ÷ Stress

E) In-situ stress ÷ Strength

Answer: B – Strength ÷ Stress
Solution: FoS = strength of material ÷ applied stress. Values >1 ensure safety.

Q8. For which age group is Periodic Medical Examination (PME) conducted every 3 years?

A) <30 years

B) 30–50 years

C) >50 years

D) All workers

E) Only new entrants

Answer: B – 30–50 years
Solution: PME cycle = every 5 years (<30), every 3 years (30–50), annually (>50).

Q9. Which is a key challenge in implementing ERP in mining enterprises?

A) Easy data migration

B) Smooth legacy system integration

C) Resistance to change and training issues

D) High user satisfaction immediately

E) Quick payback within 1 month

Answer: C – Resistance to change and training issues
Solution: ERP challenges include migration issues, resistance to change, and training costs.

Q10. Which of the following is NOT an advantage of ERP?

A) Enhanced reporting

B) Increased operational silos

C) Increased data accuracy

D) Integrated decision-making

E) Standardized processes

Answer: B – Increased operational silos
Solution: ERP reduces silos by integrating data across departments.

Q11. Which of the following does NOT improve slope stability?

A) Grass layering

B) Retaining wall

C) Anchored slope

D) Buttresses

E) Gabions

Answer: A – Grass layering
Solution: Grass prevents erosion but does not structurally stabilize slopes.

Q12. Which statistical measure represents spread of data in mine sampling?

A) Correlation

B) Variance

C) Mean

D) Mode

E) Median

Answer: B – Variance
Solution: Variance shows dispersion of data; correlation shows relationships.

Q13. Correlation coefficient values range between:

A) –5 to +5

B) –1 to +1

C) 0 to 1 only

D) –100 to +100

E) None

Answer: B – –1 to +1
Solution: r = +1 (perfect positive), –1 (perfect negative), 0 (no relation).

Q14. Blasting near an electrical substation in a mine area requires:

A) No precautions

B) Permission from DGMS, vibration monitoring, controlled blasting

C) Substation shutdown only

D) Doubling charge per hole

E) Using ANFO only

Answer: B – Permission + monitoring + controlled blasting
Solution: DGMS requires PPV monitoring, reduced charge per delay, safety clearance.

Q15. Which filtration method is most effective to remove odour from water?

A) Ultrafiltration

B) Nanofiltration

C) Pressure sand filtration

D) Activated charcoal adsorption

E) Chlorination

Answer: D – Activated charcoal adsorption
Solution: Activated carbon removes odor-causing molecules.

Q16. Key difference between ambient air quality survey and dust survey in mines is:

A) Both measure same parameters

B) Ambient = general pollutants; Dust = respirable mine dust

C) Both are for noise

D) Dust survey is outdoor only

E) None

Answer: B – Ambient = general pollutants; Dust = respirable mine dust
Solution: Dust survey measures RSPM; ambient survey covers SO₂, NOx, PM.

Q17. Chemicals are most effectively removed from water by:

A) Absorption

B) Adsorption

C) Dewatering

D) Evaporation

E) Filtration

Answer: B – Adsorption
Solution: Adsorption on activated carbon removes dissolved chemicals.

Q18. How do P-waves behave when passing from solid to liquid?

A) Speed increases

B) Speed decreases but waves continue

C) Cannot pass

D) Direction reverses

E) Constant velocity

Answer: B – Speed decreases but waves continue
Solution: P-waves pass through solids, liquids, gases; velocity reduces in liquids.

Q19. What happens if stemming height exceeds burden?

A) Better fragmentation

B) Flyrock increases

C) Energy trapped → poor fragmentation

D) Improved powder factor

E) No effect

Answer: C – Energy trapped → poor fragmentation
Solution: Excess stemming reduces effective rock breakage.

Q20. Odour removal from sewage sludge is commonly done using:

A) Lime stabilization

B) Pressure sand filter

C) Ozone injection

D) Activated charcoal

E) None

Answer: A – Lime stabilization
Solution: Lime reduces odour and pathogens in sludge treatment.

Q21. Variance in mine sampling directly affects:

A) Cost only

B) Accuracy of reserve estimation

C) Manager’s responsibility

D) Equipment selection

E) None

Answer: B – Accuracy of reserve estimation
Solution: Higher variance lowers confidence in reserves.

Q22. Which of the following is an advantage of ERP?

A) Increased silos

B) Enhanced reporting

C) Fragmented data

D) Poor compliance

E) Delay in data sharing

Answer: B – Enhanced reporting
Solution: ERP improves reporting & real-time analysis.

Q23. Difference between sludge treatment and sludge disposal is:

A) Treatment reduces volume/odour; disposal ensures safe handling

B) Both are same

C) Disposal before treatment

D) Treatment permanent

E) Disposal not required if treated

Answer: A – Treatment reduces volume/odour; disposal ensures safe handling
Solution: Treatment modifies; disposal finalizes safety.

Q24. Periodic Medical Examination (PME) above age 50 is conducted:

A) Every 2 years

B) Every 3 years

C) Annually

D) Every 5 years

E) Only on joining

Answer: C – Annually
Solution: PME cycle: <30 = 5 yrs, 30–50 = 3 yrs, >50 = yearly.

Q25. Which blasting issue is most critical near sensitive structures like substations?

A) Fragment size only

B) Flyrock only

C) Ground vibration & air overpressure

D) Cost of explosives

E) Charging speed

Answer: C – Ground vibration & air overpressure
Solution: PPV and air blast control are vital to protect structures.

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