Practice MCQs
Test your knowledge with these 25 questions.
Q1. Respirable dust particle size is:
<2 micron
<10 micron
<50 micron
<100 micron
Answer: <10 micron
Respirable dust is defined as particles smaller than 10 microns, which can penetrate deep into the lungs.
Q2. Disease caused by coal dust is:
Asthma
Pneumoconiosis
Tuberculosis
Silicosis
Answer: Pneumoconiosis
Prolonged inhalation of coal mine dust leads to Coal Workers' Pneumoconiosis (CWP).
Q3. Silicosis is caused by:
Coal dust
Silica dust
Iron ore dust
Fly ash
Answer: Silica dust
Silicosis is a lung disease caused by inhaling crystalline silica dust.
Q4. Which sampler measures respirable dust?
Gravimetric
Personal dust sampler
Real-time monitor
All of the above
Answer: All of the above
All these instruments are used for monitoring different aspects of dust concentration.
Q5. Which is NOT a dust control measure?
Water sprays
Ventilation
PPE masks
Blasting without water
Answer: Blasting without water
Blasting without water (dry blasting) significantly increases dust generation and is not a control measure.
Q6. DGMS requires dust monitoring under:
Mines Act
CMR 2017 Reg. 123
Mines Rescue Rules
Factories Act
Answer: CMR 2017 Reg. 123
Regulation 123 of the Coal Mines Regulations, 2017, specifically deals with precautions against dust.
Q7. PME stands for:
Preliminary Mine Entry
Periodical Medical Examination
Permanent Mining Engineer
Personal Mask Equipment
Answer: Periodical Medical Examination
PME is a mandatory health check-up for mine workers at regular intervals.
Q8. Gravimetric Dust Sampler measures dust in:
Answer: mg/m³
The Gravimetric Dust Sampler measures the mass (in milligrams) of dust collected per cubic meter of air.
Q9. First line of dust control is:
PPE
Water spray
Ventilation
PME
Answer: Water spray
Engineering controls like water sprays that suppress dust at the source are the first line of defense.
Q10. Haul road dust is controlled by:
PPE only
Road watering
Extra blasting
Drilling
Answer: Road watering
Using water tankers to spray haul roads is a common and effective method to control dust from vehicle movement.
Q11. DGMS insists PME because:
To detect early lung disease
To increase production
To reduce wages
To plan shifts
Answer: To detect early lung disease
PME is crucial for the early detection of occupational diseases like pneumoconiosis, allowing for timely intervention.
Q12. Which system removes dust in plants?
Bag filters & scrubbers
Water pond
Conveyor belt
Explosive blasting
Answer: Bag filters & scrubbers
Dust extraction systems like bag filters and wet scrubbers are installed in processing plants to capture airborne dust.
Q13. Dust sampling records must be kept for:
Manager’s reference only
DGMS inspection
Trade unions only
Police station
Answer: DGMS inspection
These records are statutory documents and must be available for scrutiny by DGMS officials.
Q14. PPE for dust includes:
Helmet
Dust mask/respirator
Gumboots
Gloves
Answer: Dust mask/respirator
Dust masks and respirators are Personal Protective Equipment designed to prevent inhalation of harmful dust.
Q15. Dust suppression in blasting is achieved by:
Dry holes
Water stemming & water cartridges
Open charging
No stemming
Answer: Water stemming & water cartridges
Using water for stemming or specialized water-filled cartridges helps suppress the dust generated during blasting.
Q16. Silica dust limit value as per DGMS is:
1 mg/m³
2 mg/m³
3 mg/m³
5 mg/m³
Answer: 1 mg/m³
The permissible exposure limit for respirable crystalline silica is typically around 1 mg/m³.
Q17. Dust masks are considered:
Engineering control
Administrative control
Personal protective equipment
Statutory document
Answer: Personal protective equipment
PPE, like masks, is the last line of defense, used when engineering and administrative controls are not sufficient.
Q18. Dust diseases are grouped under:
Occupational diseases
Accidents
Lifestyle diseases
Infectious diseases
Answer: Occupational diseases
These diseases arise out of or in the course of employment, making them occupational diseases.
Q19. Real-time dust monitors are useful because:
Instant readings
No lab work
Portable
All of the above
Answer: All of the above
Their key advantages are portability, immediate results, and no need for laboratory analysis.
Q20. DGMS dust standards are aligned with:
International ILO guidelines
Only Coal India
Mine owners’ choice
Factory laws
Answer: International ILO guidelines
Indian standards for occupational health, including dust, are generally aligned with guidelines from the International Labour Organization (ILO) and WHO.
Q21. Who is responsible for dust control in mines?
Blaster
DGMS only
Mine Manager
Workers
Answer: Mine Manager
The Mine Manager has the ultimate statutory responsibility for ensuring all safety measures, including dust control.
Q22. Water curtains are installed in:
Haul roads
Coal faces, transfer points
Survey office
Workshop
Answer: Coal faces, transfer points
Water curtains are strategically placed at points of high dust generation like cutting faces and conveyor transfer points.
Q23. Periodicity of PME is generally:
6 months
1 year
3 years
5 years
Answer: 3 years
While it can vary based on age and exposure, a common periodicity for PME is every 3 to 5 years. For the exam, 3-5 years is the typical range.
Q24. DGMS circulars on dust aim to:
Standardize dust control practices
Increase wages
Reduce equipment cost
Improve blasting yield
Answer: Standardize dust control practices
DGMS issues technical circulars to provide guidance and enforce standardized, effective dust control measures across all mines.
Q25. Most effective dust control is:
PPE only
Engineering control (sprays, ventilation)
PME
Warning boards
Answer: Engineering control (sprays, ventilation)
The hierarchy of controls prioritizes engineering controls that eliminate or reduce the hazard at its source as the most effective method.
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