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CM11.1-6 | Occupational Health — Graded Quiz
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Which specific form of silica is most responsible for causing silicosis in miners and quarry workers?
Correct. Crystalline silica (quartz) is the fibrogenic form responsible for silicosis. Amorphous silica is much less fibrogenic. Silicates (e.g., asbestos, talc) cause different pneumoconioses.
Crystalline silica (quartz) → silicosis (upper-zone nodules, eggshell calcification). Amorphous silica (diatomite) = low fibrogenicity. Asbestos = lower-zone fibrosis + mesothelioma. All are distinct exposures.
Incorrect. Crystalline silica (quartz) — NOT amorphous or vitreous silica — causes silicosis. Silicates cause asbestosis/talcosis.
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Asbestos exposure is most strongly associated with which malignancy, besides lung cancer?
Correct. Malignant pleural mesothelioma is the hallmark malignancy of asbestos exposure. Amphibole fibres (crocidolite, amosite) are more carcinogenic than chrysotile. Latency is 20–40 years. There is no safe level of asbestos exposure.
Asbestos → mesothelioma (pleura/peritoneum) + lung cancer (synergistic with smoking). Amphibole fibres (crocidolite = blue asbestos, amosite = brown asbestos) > chrysotile (white asbestos) for mesothelioma risk. Long latency = 20–40 years.
Incorrect. Mesothelioma of the pleura (and sometimes peritoneum) is the defining cancer associated with asbestos. Bladder cancer is linked to aromatic amines (dye industry).
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Under the ESI Act 1948, what percentage of wages does an employee contribute to the ESI fund?
Correct. The employee's ESI contribution rate is 0.75% of wages. The employer contributes 3.25%. Total = 4% of wages. Workers earning ≤₹176/day are exempt from employee contribution but are still covered.
ESI contribution rates (2020 revision): Employer 3.25% + Employee 0.75% = 4%. Workers earning ≤₹176/day are exempt from employee contribution. Central government contributes 1/8th of the total cost of medical benefit.
Incorrect. Employee = 0.75%; Employer = 3.25%; Total = 4%. The 1.75% was the older employee rate (changed in 2020).
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A woman working in a garment factory and covered under ESI delivers her first child. For how many weeks is she entitled to maternity benefit under the ESI Act (for first delivery)?
Correct. Under the ESI Act (amended to align with the Maternity Benefit Amendment Act 2017), ESI-covered women are entitled to maternity benefit at 100% of wages for 26 weeks for the first two deliveries. For the third child onwards it is 12 weeks.
ESI maternity benefit: First/second delivery = 26 weeks at 100% wages; Third delivery onwards = 12 weeks. Adoptive mothers (child <3 months) = 12 weeks. Miscarriage/MTP = 6 weeks. Enhanced benefit after sterilisation = 14 days (male) / 7 weeks (female) at 100% wages.
Incorrect. ESI maternity benefit = 26 weeks at 100% wages for first/second child (amended 2017). Third child onwards = 12 weeks. This was revised from the earlier 12-week provision.
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Workers in which industry are at HIGHEST risk of occupational mercury (inorganic) poisoning?
Correct. Chlor-alkali (electrolysis) plants using mercury cells and thermometer/manometer manufacturing are classic sources of occupational inorganic mercury exposure. Dentistry (amalgam), fluorescent lamp production, and gold mining also carry risk.
Inorganic mercury toxicity: 'mad hatter' tremor, erethism (personality change — timidity, irritability, memory loss), excessive salivation, stomatitis, pink disease (acrodynia) in children. Organic mercury (methylmercury) → Minamata disease — cerebellar ataxia, visual field constriction. Biological monitoring: urinary mercury.
Incorrect. Mercury hazard is highest in chlor-alkali plants and mercury instrument manufacturing, not coal mining (silica), cotton mills (byssinosis), or battery factories (lead).
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In the occupational health hierarchy of controls, which is the MOST effective strategy to prevent occupational disease?
Correct. Elimination (removing the hazard) or substitution (replacing with a safer alternative) is the most effective control — it removes the hazard at source. Engineering controls (LEV), administrative controls, and PPE follow in decreasing effectiveness.
Hierarchy of controls (Factories Act 1948 + WHO): 1) Elimination (most effective); 2) Substitution (safer material/process); 3) Engineering controls (LEV, enclosure, isolation); 4) Administrative controls (rotation, hours, training); 5) PPE (least reliable — compliance-dependent). Primary prevention = 1+2+3.
Incorrect. PPE is the LEAST reliable control (lowest in the hierarchy). The hierarchy from top to bottom: Elimination → Substitution → Engineering → Administrative → PPE.
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For a computer workstation user working 8 hours per day, which ergonomic guideline is MOST important to prevent musculoskeletal work-related upper limb disorders (WRULDs)?
Correct. Neutral wrist position (avoiding sustained flexion/extension) and regular micro-breaks every 30 minutes are the most evidence-based ergonomic interventions to prevent carpal tunnel syndrome and related WRULDs. Elbow at 90° supports a neutral wrist.
DSE workstation ergonomics: Top of monitor at or slightly below eye level; monitor 50–70 cm from eyes; keyboard at elbow height (90° elbow, neutral wrist); feet flat on floor; lumbar support; micro-breaks every 30 min (20-20-20 rule for eyes). Prevents CTS, neck pain, low back pain.
Incorrect. Neutral wrist + 90° elbow + regular micro-breaks are the cornerstone ergonomic interventions for keyboard workers. Knees above hips compresses popliteal vessels; monitor at 45° increases neck torsion.
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Among the following bloodborne pathogens, which has the highest transmission risk per needlestick injury from an HBeAg-positive source?
Correct. HBV has the highest needlestick transmission risk: 6–30% when source is HBeAg-positive, reflecting its high serum titre (up to 10⁸ virions/mL). HCV is 0.5–2%, HIV is ~0.3%. Prevention: HBV vaccination (3-dose) is the most effective occupational health intervention for HCWs.
Needlestick transmission risks: HBV (HBeAg+) = 6–30%; HBV (HBeAg−) = 1–6%; HCV = 0.5–2%; HIV = ~0.3%. Prevention: HBV vaccination (3-dose: 0, 1, 6 months); HIV PEP = TDF+FTC+DTG × 28 days within 72 hours; no HCV PEP available. Post-exposure testing at baseline, 6 weeks, 12 weeks.
Incorrect. HBV (6–30%) >> HCV (0.5–2%) > HIV (~0.3%) per needlestick event. HBV vaccine is the cornerstone prevention for healthcare workers.
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A consultant anaesthesiologist develops emotional exhaustion, depersonalisation, and a sense of reduced personal accomplishment after 15 years of on-call service. Which validated tool is most commonly used to measure the severity of occupational burnout?
Correct. The Maslach Burnout Inventory (MBI) is the gold standard validated tool for measuring occupational burnout across three dimensions: emotional exhaustion, depersonalisation (cynicism), and reduced personal accomplishment.
Burnout (Maslach): 3 dimensions — emotional exhaustion + depersonalisation + reduced personal accomplishment. Tool: MBI. Causes in HCWs: long hours, loss of autonomy, moral distress, poor teamwork. Prevention: workload limits (European Working Time Directive), peer support, mindfulness, restorative supervision.
Incorrect. MBI is the standard burnout tool. PHQ-9 measures depression; HAM-A measures anxiety; PSS measures perceived stress — these are related but distinct constructs.
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Workers in which industry are at highest risk of occupational bladder cancer due to exposure to beta-naphthylamine?
Correct. Beta-naphthylamine (2-naphthylamine), an aromatic amine used in synthetic dye and rubber industry, is the classic occupational carcinogen for transitional cell carcinoma of the urinary bladder. Long latency of 15–25 years after first exposure.
Occupational cancers — classic pairs: Beta-naphthylamine (dye/rubber) → bladder TCC; Arsenic (smelting, pesticides) → lung/skin cancer; Benzene → leukaemia; Vinyl chloride → hepatic angiosarcoma; Asbestos → mesothelioma; Radium → osteosarcoma; Chromium → nasal/lung cancer. Pott's chimney-sweep cancer = scrotal SCC (coal tar/soot).
Incorrect. Beta-naphthylamine (aromatic amine) → bladder cancer is the occupational cancer classic from dye/rubber industry. Asbestos → mesothelioma; coal tar pitch → scrotal cancer (Sir Percivall Pott's chimney sweep cancer); uranium → lung cancer.
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