Occupational Health Practice Questions

Q: Which occupational exposure is NOT yet confirmed to cause a lung problem?

Lead. **Explanation:** In occupational medicine, the lung is a primary target organ for inhaled carcinogens and irritants. The correct answer is **Lead (C)** because, while lead is a potent systemic toxin affecting the hematopoietic, renal, and nervous systems, it is **not** a confirmed cause of primary lung disease or lung cancer. Lead exposure typically occurs through inhalation or ingestion, but its pathology manifests as anemia (basophilic stippling), peripheral neuropathy (wrist drop), and nephropathy. **Analysis of Incorrect Options:** * **Nickel (A):** Nickel refining is a well-established cause of lung and nasal sinus cancers. It is classified as a Group 1 carcinogen by the IARC. * **Chromium (B):** Hexavalent chromium [Cr(VI)], used in electroplating and pigment manufacturing, is a potent respiratory carcinogen. It is also famous for causing "chrome holes" (painless skin ulcers) and nasal septum perforation. * **Arsenic (D):** Inhalation of arsenic (common in smelting and pesticide industries) is strongly linked to lung cancer, while ingestion is linked to skin and bladder cancers. **High-Yield Clinical Pearls for NEET-PG:** * **IARC Group 1 Respiratory Carcinogens:** Asbestos, Arsenic, Beryllium, Cadmium, Chromium (VI), Nickel, and Silica. * **Lead Poisoning (Plumbism):** Focus on **Burtonian lines** (blue-purplish line on gums), **ALAD enzyme inhibition**, and **increased urinary coproporphyrin**. * **Rule of Thumb:** If a metal causes "nasal septum perforation" (Chromium, Arsenic), it is almost always linked to lung pathology. Lead does not cause respiratory tract erosion or malignancy.

Q: Bagassosis occurs with exposure to which of the following?

Sugarcane fibres. **Explanation:** **Bagassosis** is an occupational lung disease caused by the inhalation of dust from **sugarcane fibres** (bagasse). Bagasse is the fibrous residue left after the extraction of juice from sugarcane. When stored in damp conditions, it becomes a breeding ground for the thermophilic actinomycete, ***Thermoactinomyces sacchari***. Inhalation of these fungal spores triggers a Type III hypersensitivity reaction (Extrinsic Allergic Alveolitis), leading to symptoms like breathlessness, cough, and fever. **Analysis of Options:** * **Cotton dust (Option A):** Exposure leads to **Byssinosis** (also known as Monday Morning Fever or Brown Lung Disease). It is characterized by chest tightness on the first day of the work week. * **Carbon particles (Option C):** Prolonged inhalation of coal dust or carbon leads to **Anthracosis** (Coal Worker’s Pneumoconiosis). * **Silica fibres (Option D):** Inhalation of free silica (silicon dioxide) causes **Silicosis**, the most common and serious occupational pneumoconiosis in India, often seen in mining and stone-cutting industries. **High-Yield Clinical Pearls for NEET-PG:** * **Prevention:** The most effective preventive measure for Bagassosis is **moistening the bagasse** (spraying with 2% propionic acid) to prevent dust aerosolization and fungal growth. * **Radiology:** Chest X-ray typically shows a "mottled appearance" or "fine punctate shadows." * **Farmer’s Lung:** Similar to Bagassosis but caused by *Micropolyspora faeni* found in moldy hay. * **Key Distinction:** Unlike Silicosis or Asbestosis, Bagassosis is an **allergic alveolitis**, not a primary fibrotic pneumoconiosis.

Q: What was the gas responsible for the Bhopal gas tragedy?

Methyl isocyanate. The Bhopal Gas Tragedy, which occurred on the night of December 2–3, 1984, is considered the world's worst industrial disaster. It was caused by the accidental release of over 40 tons of **Methyl Isocyanate (MIC)** gas from the Union Carbide India Limited (UCIL) pesticide plant. **Explanation of the Correct Option:** * **Methyl Isocyanate (MIC):** MIC is an extremely toxic, volatile, and colorless liquid used in the production of carbamate pesticides (like Sevin/Carbaryl). When it leaked, it reacted with water in the atmosphere to form a dense cloud that settled over the city. Pathologically, it causes severe mucosal irritation, pulmonary edema, and secondary complications due to its high reactivity with proteins and DNA. **Explanation of Incorrect Options:** * **Potassium/Sodium Isothiocyanate:** These are inorganic salts often used in chemical synthesis or as analytical reagents. They do not exist as volatile gases and were not involved in the pesticide manufacturing process at the Bhopal plant. * **Ethyl Isothiocyanate:** While chemically related, this compound is primarily used in organic synthesis and as a flavoring agent (mustard oil derivative). It lacks the extreme industrial toxicity and historical association linked to the Bhopal disaster. **High-Yield Clinical Pearls for NEET-PG:** * **Antidote Controversy:** Sodium Thiosulfate was initially suggested as an antidote based on the theory of cyanide poisoning, though its efficacy remains debated. * **Health Impacts:** The immediate cause of death for most victims was **asphyxiation due to acute pulmonary edema**. Long-term survivors suffer from chronic obstructive lung disease, restrictive lung disease, and ophthalmic issues (corneal opacities). * **Environmental Health:** This event led to the enactment of the **Environment Protection Act (1986)** in India.

Q: Which of the following is considered a major occupational cancer?

Skin cancer. **Explanation:** In the context of occupational health, **Skin Cancer** is historically and statistically recognized as the most common form of occupational cancer. This is primarily due to the vast number of workers exposed to ultraviolet (UV) radiation (outdoor workers) and various chemical carcinogens like coal tar, shale oil, and arsenic. Percivall Pott’s 1775 observation of scrotal cancer in chimney sweeps was the first landmark discovery in occupational oncology, linking soot exposure to skin malignancy. **Analysis of Options:** * **Skin Cancer (Correct):** It accounts for a significant portion of occupational malignancies. Key agents include UV rays, polycyclic aromatic hydrocarbons (PAHs), and ionizing radiation. * **Lung Cancer:** While it is the leading cause of occupational cancer *deaths*, it is not the most frequent in terms of overall incidence compared to skin lesions. Major triggers include asbestos, silica, and radon. * **Bladder Cancer:** This is a classic occupational cancer associated with the dye and rubber industries (exposure to aromatic amines like Benzidine and Beta-naphthylamine), but its prevalence is lower than skin cancer. * **Leukemias:** These are specifically linked to benzene exposure and ionizing radiation. While high-yield for exams, they represent a smaller fraction of total occupational cancer cases. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Skin. * **Most common fatal site:** Lung. * **Bladder Cancer:** Associated with **Benzidine** (Dye industry). * **Angiosarcoma of Liver:** Specifically linked to **Vinyl Chloride** (PVC industry). * **Mesothelioma:** Pathognomonic for **Asbestos** exposure. * **Benzene:** Strongly associated with **Acute Myeloid Leukemia (AML)**.

Q: Symptoms of metal fume fever resolve spontaneously within how many hours?

24-36 hours. **Explanation:** **Metal Fume Fever (MFF)** is an inhalation-based occupational disease caused by exposure to metal oxide fumes, most commonly **Zinc oxide** (during galvanizing or welding) and Magnesium oxide. **1. Why 24-36 hours is correct:** The pathophysiology involves an acute inflammatory response in the lungs, leading to the release of cytokines (IL-6, IL-8, and TNF-α). The clinical course is characteristically **self-limiting**. Symptoms typically appear 3–10 hours after exposure (often called "Monday Morning Fever") and reach peak intensity within 18 hours. The systemic inflammatory response resolves spontaneously as the body clears the pyrogens, with complete recovery occurring within **24 to 36 hours** without permanent sequelae. **2. Why other options are incorrect:** * **6-12 hours:** This is the typical timeframe for the *onset* of symptoms, not the resolution. * **12-24 hours:** While symptoms begin to subside during this window, the physiological recovery and return to baseline usually extend beyond 24 hours. * **36-48 hours:** This is longer than the standard clinical course for uncomplicated metal fume fever; if symptoms persist beyond 48 hours, clinicians should investigate for chemical pneumonitis or secondary infection. **High-Yield Clinical Pearls for NEET-PG:** * **Commonest Cause:** Zinc Oxide (Welder’s Ague/Brass Founder’s Ague). * **Key Symptom:** Flu-like illness (fever, chills, metallic taste in the mouth). * **Tachyphylaxis:** A unique feature where repeated exposure during the work week leads to temporary tolerance, which is lost over the weekend (hence "Monday Morning Fever"). * **Management:** Purely supportive (bed rest, hydration, antipyretics). No specific antidote is required.

Q: Which of the following diseases does not require screening for workers employed in a dye industry?

Anemia. In the dye industry, workers are primarily exposed to **aromatic amines** (such as benzidine and beta-naphthylamine), which are potent carcinogens and respiratory irritants. ### Why Anemia is the Correct Answer While some industrial chemicals (like lead or benzene) cause anemia, the chemicals used in the dye industry do not typically target the erythropoietic system. Screening for **Anemia** is not a standard or specific requirement for dye industry workers because it does not reflect the primary toxicological risks associated with aromatic amines. ### Analysis of Incorrect Options * **Bladder Cancer:** This is the most significant occupational hazard in the dye industry. Aromatic amines are metabolized in the body and excreted in the urine, where they act on the transitional epithelium. Long-term exposure leads to a high incidence of transitional cell carcinoma. * **Precancerous Lesions:** Regular screening (via urine cytology or cystoscopy) is mandatory to detect early cellular changes or "precancerous" states before they progress to invasive malignancy. * **Bronchial Asthma:** Workers are exposed to various chemical dusts, fumes, and sensitizers that can cause occupational asthma or reactive airways dysfunction syndrome (RADS). Respiratory screening is essential to monitor lung function. ### High-Yield Clinical Pearls for NEET-PG * **The "Gold Standard" Screening:** For dye workers, **exfoliative cytology of urine** is the most important screening tool for early detection of bladder cancer. * **Latent Period:** Occupational bladder cancer has a long latent period, often appearing **10–20 years** after initial exposure. * **Key Carcinogens:** Beta-naphthylamine, Benzidine, and Para-aminodiphenyl are the "classic" culprits. * **Prevention:** The most effective preventive measure is the **substitution** of hazardous dyes with safer alternatives.

Q: What is the minimum recommended space for each factory worker?

500 cubic feet. **Explanation:** The correct answer is **500 cubic feet**. This requirement is mandated under the **Factories Act of 1948** (Section 16) to prevent overcrowding and ensure adequate ventilation in the workplace. Overcrowding in industrial settings increases the risk of respiratory infections, heat stress, and accidents. * **Why 500 cubic feet is correct:** For factories built or expanded **after** the commencement of the Act, the law stipulates a minimum space of **500 cubic feet (approx. 14.2 cubic meters)** per worker. When calculating this space, any height above **14 feet (4.25 meters)** from the floor is excluded to ensure the volume represents usable, breathable air at the worker's level. * **Why other options are incorrect:** * **250 and 200 cubic feet:** These values are significantly below the legal health standards for industrial ventilation and would lead to rapid CO2 buildup and thermal discomfort. * **700 cubic feet:** While more space is generally better for health, this exceeds the specific legal minimum requirement defined by Indian labor laws. **High-Yield NEET-PG Pearls:** 1. **Old Factories:** For factories existing **before** the 1948 Act, the minimum requirement was **350 cubic feet** per worker. 2. **The Factories Act (1948):** This is the primary legislation governing occupational health in India. Key provisions include: * Maximum working hours: **48 hours/week**. * Maximum daily hours: **9 hours/day**. * Spread-over: Not to exceed **10.5 hours**. * Leave with wages: 1 day for every 20 days of work. 3. **Threshold Limit Value (TLV):** Refers to the airborne concentration of a substance to which nearly all workers can be exposed daily without adverse effects.

Q: What disease is caused by exposure to cotton dust?

Byssinosis. **Explanation:** **Byssinosis (Option A)** is the correct answer. It is an occupational lung disease caused by the inhalation of **cotton, flax, or hemp dust**. The underlying pathophysiology involves the release of histamine or other mediators from mast cells in the lungs, leading to bronchoconstriction. **Why other options are incorrect:** * **Bagassosis (Option B):** Caused by inhalation of **sugar cane dust** (bagasse) containing the fungus *Thermoactinomyces sacchari*. * **Farmer’s Lung (Option C):** A type of hypersensitivity pneumonitis caused by inhaling **moldy hay** or grain containing *Saccharopolyspora rectivirgula*. * **Asthma (Option D):** While cotton dust can trigger asthma-like symptoms, "Byssinosis" is the specific clinical entity associated with chronic cotton dust exposure in an occupational setting. **High-Yield Clinical Pearls for NEET-PG:** 1. **Monday Chest Tightness:** This is the hallmark symptom of Byssinosis. Symptoms are worst on the first day of the work week after a break and improve as the week progresses. 2. **Grading (Schilling’s Classification):** * **Grade 1:** Occasional chest tightness on the first day of the work week. * **Grade 2:** Chest tightness on the first and other days of the work week. * **Grade 3:** Grade 2 symptoms plus evidence of permanent incapacity (reduced lung function). 3. **Prevention:** Use of "Workroom Ventilation" and "Pre-employment/Periodic medical checkups" are vital. The most effective engineering control is the use of **local exhaust ventilation**.

Question 1

Which occupational exposure is NOT yet confirmed to cause a lung problem?

Accepted Answer

Lead

Answer

Nickel

Answer

Chromium

Answer

Arsenic

Question 2

Bagassosis occurs with exposure to which of the following?

Accepted Answer

Sugarcane fibres

Answer

Cotton dust

Answer

Carbon particles

Answer

Silica fibres

Question 3

What was the gas responsible for the Bhopal gas tragedy?

Accepted Answer

Methyl isocyanate

Answer

Potassium iso thiocyanate

Answer

Sodium isothiocyanate

Answer

Ethyl isothiocyanate

Question 4

All of the following statements relating to lung carcinoma and occupation are true except?

Accepted Answer

It takes more time to develop as compared to general population

Answer

Risk is increased

Answer

Takes long time to develop

Answer

It takes less time to develop as compared to general population

Question 5

Which of the following is considered a major occupational cancer?

Accepted Answer

Skin cancer

Answer

Lung cancer

Answer

Bladder cancer

Answer

Leukemias

Question 6

Symptoms of metal fume fever resolve spontaneously within how many hours?

Accepted Answer

24-36 hours

Answer

6-12 hours

Answer

12-24 hours

Answer

36-48 hours

Question 7

Which of the following diseases does not require screening for workers employed in a dye industry?

Accepted Answer

Anemia

Answer

Bronchial asthma

Answer

Bladder cancer

Answer

Precancerous lesion

Question 8

What is the minimum recommended space for each factory worker?

Accepted Answer

500 cubic feet

Answer

200 cubic feet

Answer

250 cubic feet

Answer

700 cubic feet

Question 9

What disease is caused by exposure to cotton dust?

Accepted Answer

Byssinosis

Answer

Bagassosis

Answer

Farmer's lung

Answer

Asthma

Question 10

Which of the following statements about N95 masks is true?

Accepted Answer

A beard does not allow for a proper seal and makes the N95 ineffective.

Answer

They were designed for influenza viruses during the H1N1 outbreak.

Answer

N- stands for National Institute of Occupational Safety and Health.

Answer

It filters 95% of all particles smaller than 0.3 micrometers.

Occupational Health — MCQs

Occupational Health — MCQs

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