Occupational Health — MCQs

Occupational Health Indian Medical PG Practice Questions and MCQs

Question 71: In factories, a welfare officer is appointed when the number of workers exceeds which threshold?

A. 350
B. 500 (Correct Answer)
C. 1000
D. 5000

Explanation: **Explanation:** The appointment of a Welfare Officer is a statutory requirement under **Section 49 of the Factories Act, 1948**. This act mandates that every factory employing **500 or more workers** must appoint a designated Welfare Officer to ensure the well-being, safety, and health of the employees. **Why Option B is Correct:** The threshold of **500 workers** is the legal benchmark established to ensure that larger workforces have a dedicated professional to mediate between management and labor, oversee canteen and crèche facilities, and ensure compliance with labor laws. **Analysis of Incorrect Options:** * **Option A (350):** This number does not correspond to any specific statutory requirement under the Factories Act. * **Option C (1000):** This is a common distractor. Under the Factories Act, a **Safety Officer** must be appointed when the number of workers exceeds **1,000** (or in smaller factories involving hazardous processes). * **Option D (5000):** This number is not a standard threshold for individual factory welfare or safety appointments in the context of the NEET-PG syllabus. **High-Yield Clinical Pearls for NEET-PG:** * **Crèche Facility:** Mandatory if more than **30 women** are employed. * **Canteen:** Mandatory if more than **250 workers** are employed. * **First Aid Box:** One box for every **150 workers**. * **Safety Officer:** Required if workers > **1,000**. * **Welfare Officer:** Required if workers > **500**. * **ESI Act (1948):** Applies to non-seasonal factories using power with >10 employees or non-power using with >20 employees.

Question 72: The Rajiv Gandhi Shramik Kalyan Yojana is a scheme that falls under which of the following programs?

A. Reproductive and Child Health (RCH)
B. Employees' State Insurance (ESI) (Correct Answer)
C. Maternal and Child Health (MCH) programmer
D. National Population Policy

Explanation: ### Explanation **Correct Option: B. Employees' State Insurance (ESI)** The **Rajiv Gandhi Shramik Kalyan Yojana (RGSKY)** was introduced by the ESI Corporation in **2005**. It is an **Unemployment Allowance scheme** designed to provide a safety net for workers covered under the ESI Act. Under this scheme, if an insured person becomes unemployed due to the closure of a factory/establishment, retrenchment, or permanent invalidity (at least 40%) arising out of non-employment injury, they are entitled to: 1. **Unemployment Allowance:** Cash compensation for a maximum period of 24 months. 2. **Medical Care:** Continued medical facilities for the worker and their family from ESI hospitals/dispensaries. 3. **Vocational Training:** Skill upgrading provided through the Ministry of Labour and Employment. --- ### Why Other Options are Incorrect: * **A & C (RCH and MCH):** These programs focus on maternal health, immunization, and child survival. While ESI provides maternity benefits, the RGSKY specifically addresses unemployment and labor welfare, which falls outside the scope of RCH/MCH. * **D (National Population Policy):** This policy focuses on achieving stable population growth, contraception, and reproductive health infrastructure, rather than social security or unemployment benefits for industrial workers. --- ### High-Yield Facts for NEET-PG: * **ESI Act (1948):** Applies to factories employing **10 or more** persons. * **Wage Ceiling:** Currently, employees earning up to **₹21,000 per month** (₹25,000 for persons with disabilities) are covered. * **Contribution Rates:** Employee contributes **0.75%** and the Employer contributes **3.25%** of the wages. * **Atal Bimit Vyakti Kalyan Yojana:** A recent extension/related scheme under ESI that also provides relief to workers who lose their jobs. * **Funeral Expenses:** ESI provides a one-time payment (currently ₹15,000) for the funeral of an insured person.

Question 73: The best mutual adjustment of man and his work for the improvement of human efficiency is known as:

A. Ergonomics (Correct Answer)
B. Euthenics
C. Eugenics
D. None of the above

Explanation: ### Explanation **1. Why Ergonomics is Correct:** The term **Ergonomics** is derived from the Greek words *Ergon* (work) and *Nomos* (law). It is defined as the study of the relationship between workers and their environment, specifically focusing on the **"fitting the job to the worker"** rather than forcing the worker to fit the job. The primary objective is to achieve the best mutual adjustment between man and his work to improve human efficiency, safety, and comfort while reducing the risk of musculoskeletal disorders and occupational fatigue. **2. Why Other Options are Incorrect:** * **Euthenics:** This refers to the improvement of the human race by altering **external environmental factors** (such as nutrition, education, and sanitation) to allow the best possible expression of existing genes. * **Eugenics:** This is the science of improving the genetic stock of the human population through **selective breeding**. It is divided into *Positive Eugenics* (encouraging breeding of those with desirable traits) and *Negative Eugenics* (discouraging breeding of those with defects). **3. NEET-PG High-Yield Pearls:** * **Ergonomics Goal:** To reduce "Human Cost" of work (fatigue, accidents, and errors). * **Anthropometry:** A key component of ergonomics involving the measurement of human body dimensions to design workstations and tools. * **Common Ergonomic Injuries:** Carpal Tunnel Syndrome (CTS), Tenosynovitis, and Lower Back Pain. * **Euphenics:** (Often confused with the others) This involves the symptomatic treatment of genetic diseases (e.g., insulin for diabetes or phenylketonuria management) to improve the phenotype without changing the genotype.

Question 74: Where is the Central Labour Institute located?

A. Mumbai (Correct Answer)
B. Kolkata
C. Chennai
D. Kanpur

Explanation: **Explanation:** The **Central Labour Institute (CLI)** is located in **Mumbai**. Established in 1966, it functions under the Directorate General Factory Advice Service & Labour Institutes (DGFASLI), Ministry of Labour and Employment. It serves as a socio-economic laboratory and a national institute dealing with the scientific study of all aspects of industrial development as relating to the human factor. It is the apex body for research, training, and consultancy in Occupational Safety and Health (OSH) in India. **Analysis of Options:** * **A. Mumbai (Correct):** It houses the CLI, which includes specialized centers like the Industrial Hygiene Laboratory and the Safety Museum. * **B, C, and D (Incorrect):** While these cities do not house the *Central* Institute, they are the locations of the **Regional Labour Institutes (RLIs)**. * **Kolkata:** Serves the Eastern region. * **Chennai:** Serves the Southern region. * **Kanpur:** Serves the Northern region. * *(Note: A fourth RLI is located in Faridabad).* **High-Yield Clinical Pearls for NEET-PG:** * **Pneumoconiosis:** The CLI plays a vital role in the surveillance of occupational lung diseases like Silicosis and Asbestosis. * **The Factories Act, 1948:** This is the primary legislation the CLI helps implement to ensure worker safety. * **Notifiable Diseases:** Under the Factories Act, there are **29 scheduled diseases** (e.g., Lead poisoning, Anthrax, Silicosis) that must be reported to the Chief Inspector of Factories. * **National Institute of Occupational Health (NIOH):** Do not confuse CLI with NIOH, which is located in **Ahmedabad** (under ICMR).

Question 75: What is the HIV seroconversion ratio after a needle-stick injury?

A. Less than 1 in 3000
B. Less than 1 in 300
C. Less than 3 in 1000 (Correct Answer)
D. Less than 3 in 100

Explanation: **Explanation:** The risk of HIV transmission following a percutaneous exposure (needle-stick injury) is relatively low compared to other blood-borne pathogens. According to the CDC and standard occupational health guidelines, the average risk of HIV seroconversion after a single needle-stick injury involving HIV-infected blood is approximately **0.3%**. 1. **Why Option C is Correct:** 0.3% mathematically translates to **3 in 1,000**. Therefore, the risk is accurately described as "less than 3 in 1,000" (or roughly 1 in 333). This figure represents the baseline risk before the administration of Post-Exposure Prophylaxis (PEP). 2. **Why Other Options are Incorrect:** * **Option A (<1 in 3000):** This underestimates the risk significantly (0.03%). This level of risk is more characteristic of mucous membrane exposure (0.09%). * **Option B (<1 in 300):** While 1 in 300 is approximately 0.33%, the standard epidemiological benchmark used in exams is the "Rule of 3," making Option C the more precise technical choice. * **Option D (<3 in 100):** This represents a 3% risk, which is ten times higher than the actual risk for HIV. However, 3% is the approximate risk for **Hepatitis C (HCV)** transmission. **High-Yield Clinical Pearls for NEET-PG:** * **The Rule of 3s (Risk of transmission after needle-stick):** * **Hepatitis B (HBV):** ~30% (Highest risk, especially if HBeAg positive). * **Hepatitis C (HCV):** ~3%. * **HIV:** ~0.3%. * **Mucous Membrane Exposure:** The risk for HIV is even lower, approximately **0.09%**. * **PEP Timing:** Post-Exposure Prophylaxis for HIV should ideally be started within **2 hours**, but can be initiated up to **72 hours** post-exposure. The standard duration is **28 days**.

Question 76: A person working in a high-temperature environment should increase their intake of which of the following?

A. Sodium chloride (NaCl) (Correct Answer)
B. Iron
C. Vitamin D
D. Phosphates

Explanation: ### Explanation **Correct Option: A. Sodium chloride (NaCl)** When a person works in a high-temperature environment (e.g., steel plants, mines, or glass factories), the body’s primary thermoregulatory mechanism is **sweating**. Sweat is not just water; it contains significant amounts of electrolytes, primarily **sodium and chloride**. Prolonged exposure to heat leads to excessive perspiration, which can result in a significant deficit of salt. If only water is replaced without adequate salt, it leads to a condition known as **Heat Cramps** (painful muscle contractions due to hyponatremia). To prevent heat-related illnesses like heat exhaustion and heat cramps, the intake of sodium chloride must be increased. In industrial settings, this is often managed by adding salt to drinking water (0.1% concentration) or providing salt tablets. **Why other options are incorrect:** * **B. Iron:** Iron deficiency leads to anemia but is not acutely affected by heat exposure or sweat loss. * **C. Vitamin D:** While sunlight (heat source) helps synthesize Vitamin D, there is no physiological requirement to increase its intake specifically due to high-temperature work environments. * **D. Phosphates:** Phosphates are intracellular anions; their loss in sweat is negligible compared to the massive loss of sodium and chloride. **High-Yield Clinical Pearls for NEET-PG:** * **Heat Cramps:** Caused by salt depletion. Treatment involves oral or IV saline. * **Heat Exhaustion:** Caused by both water and salt depletion. The patient is conscious but has a high pulse and cool/clammy skin. * **Heat Stroke:** A medical emergency characterized by a core body temperature **>40.6°C (105°F)** and **anhidrosis** (absence of sweating) due to failure of the thermoregulatory center. * **Acclimatization:** The physiological adaptation to heat. It takes about **7–14 days**, during which the sodium content in sweat decreases (the body becomes better at conserving salt).

Question 77: What is the upper limit of safety for carbon monoxide in air?

A. 0.20%
B. 0.01% (Correct Answer)
C. 0.40%
D. 0.01%

Explanation: **Explanation:** Carbon monoxide (CO) is a colorless, odorless, and highly toxic gas produced by the incomplete combustion of carbonaceous materials. In the context of occupational health, the **upper limit of safety** (or the maximum permissible concentration) for carbon monoxide in the air is **0.01% (100 parts per million)**. **Why 0.01% is correct:** At this concentration, an individual can be exposed for a standard workday without significant health risks. CO has an affinity for hemoglobin that is 200–250 times greater than that of oxygen, forming carboxyhemoglobin (COHb). Maintaining the air concentration at or below 0.01% ensures that COHb levels in the blood remain below the threshold that triggers acute symptoms like headache, dizziness, or respiratory distress. **Analysis of Incorrect Options:** * **0.20% (Option A):** This concentration is dangerously high. Exposure to 0.2% CO can cause unconsciousness and death within a very short period (approximately 30–60 minutes). * **0.40% (Option C):** This is a lethal concentration. Exposure to 0.4% CO is typically fatal within less than 30 minutes as it rapidly displaces oxygen from hemoglobin. * **Option D:** This is a duplicate of the correct answer (0.01%). **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** CO causes a "left shift" in the oxygen-dissociation curve, meaning hemoglobin holds onto oxygen more tightly, preventing its release to tissues. * **Diagnosis:** The cherry-red discoloration of skin/mucosa is a classic (though often post-mortem) finding. * **Treatment:** The treatment of choice is 100% Oxygen (shortens COHb half-life). Hyperbaric oxygen is indicated in severe cases (e.g., pregnancy, coma, or COHb >25%). * **Threshold Limit Value (TLV):** While 0.01% is the general safety limit, the ACGIH recommends a TLV-TWA of **25 ppm** for an 8-hour workday to prevent subclinical neurocognitive effects.

Question 78: Which type of lung carcinoma is most commonly associated with occupational exposure?

A. Asbestosis (Correct Answer)
B. Silicosis
C. Byssinosis
D. Beryllium exposure

Explanation: **Explanation:** The correct answer is **Asbestosis (Option A)**. Asbestos is a well-established potent human carcinogen. While asbestosis refers to the interstitial fibrosis caused by asbestos fibers, it is the occupational exposure most strongly linked to an increased risk of bronchogenic carcinoma. In fact, **Squamous cell carcinoma** and **Adenocarcinoma** are the most common types of lung cancer associated with asbestos, and the risk is synergistically multiplied (up to 50-90 times) if the worker is also a cigarette smoker. **Analysis of Incorrect Options:** * **Silicosis (Option B):** Caused by inhalation of free silica ($SiO_2$). While the IARC classifies silica as a Group 1 carcinogen, its primary clinical association is with an increased susceptibility to **Tuberculosis** (Silicotuberculosis) rather than being the "most common" occupational driver for lung cancer compared to asbestos. * **Byssinosis (Option C):** Also known as "Monday Morning Fever," this is caused by cotton, flax, or hemp dust. It leads to chronic obstructive airway disease but is **not** associated with an increased risk of lung carcinoma. * **Beryllium exposure (Option D):** Causes Berylliosis (a granulomatous disease mimicking sarcoidosis). While chronic exposure is linked to lung cancer, it is far less common in the industrial population than asbestos exposure. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cancer in Asbestos:** Bronchogenic Carcinoma (NOT Mesothelioma). * **Specific cancer for Asbestos:** Mesothelioma (rare but highly specific). * **Synergistic Effect:** Asbestos + Smoking = Multiplicative risk for lung cancer. * **Diagnostic Hallmark:** Ferruginous bodies (Asbestos bodies) in sputum or lung biopsy.

Question 79: What kind of benefit is provided under the Rajiv Gandhi Shramik Kalyan Yojana to covered employees?

A. Medical benefit
B. Unemployment benefit (Correct Answer)
C. Maternity benefit
D. Dependant's benefit

Explanation: **Explanation:** The **Rajiv Gandhi Shramik Kalyan Yojana (RGSKY)**, introduced by the ESI Corporation on April 1, 2005, is a specific scheme designed to provide social security to insured persons who face involuntary loss of employment. **1. Why Option B is Correct:** The core objective of RGSKY is to provide **Unemployment Benefit**. It applies to employees who lose their jobs due to the closure of a factory/establishment, retrenchment, or permanent invalidity (at least 40%) arising out of non-employment injury. Under this scheme, the beneficiary receives a cash allowance (50% of last average daily wages) for a maximum period of **24 months** during their entire service life. **2. Why Other Options are Incorrect:** * **Medical Benefit (A):** While ESI provides medical care, RGSKY specifically refers to the unemployment cash allowance. However, beneficiaries under RGSKY *also* remain entitled to medical care for themselves and their families during the period they receive the unemployment allowance. * **Maternity Benefit (C):** This is provided under Section 46 of the ESI Act for pregnancy/confinement, not under the RGSKY scheme. * **Dependant’s Benefit (D):** This is a monthly pension paid to the family members of an insured person who dies as a result of an employment injury or occupational disease. **3. High-Yield Facts for NEET-PG:** * **Eligibility:** The insured person must have contributed to ESI for at least **2 years** prior to unemployment. * **Duration:** Benefit is payable for a maximum of **24 months** (increased from the initial 6/12 months). * **Vocational Training:** The scheme also covers the expenditure on vocational training for upgrading skills to improve re-employability. * **Atal Beemit Vyakti Kalyan Yojana (ABVKY):** A related recent scheme that also provides relief to workers who become unemployed, often confused with RGSKY.

Question 80: Metal fume fever is related to exposure to fumes of which metal?

A. Mercury
B. Lead
C. Zinc (Correct Answer)
D. Arsenic

Explanation: **Explanation:** **Metal Fume Fever (MFF)**, also known as "Monday morning fever" or "Zinc shakes," is an inhalation febrille reaction caused by exposure to metal oxide fumes. **Why Zinc is the Correct Answer:** The most common cause of Metal Fume Fever is the inhalation of **Zinc Oxide** fumes, typically generated during industrial processes like galvanizing, zinc smelting, or welding on galvanized steel. When inhaled, these fine particles reach the alveoli and trigger the release of pro-inflammatory cytokines (like TNF-α and IL-8), leading to a flu-like syndrome characterized by fever, chills, malaise, and a metallic taste in the mouth. Symptoms usually peak 12–24 hours after exposure and resolve spontaneously within 48 hours. **Analysis of Incorrect Options:** * **A. Mercury:** Chronic exposure leads to **Minamata disease**, tremors, and erethism (mercurial erethism). Acute inhalation of high concentrations causes chemical pneumonitis, not the transient flu-like syndrome of MFF. * **B. Lead:** Chronic lead poisoning (**Plumbism**) presents with abdominal colic, wrist drop/foot drop (peripheral neuropathy), and Burtonian lines on gums. It does not cause a febrile "fume" reaction. * **C. Arsenic:** Chronic exposure is associated with hyperpigmentation (Raindrop pigmentation), hyperkeratosis of palms/soles, and various cancers (skin, lung, bladder). **High-Yield Clinical Pearls for NEET-PG:** * **Tachyphylaxis:** A unique feature of MFF where workers develop a temporary tolerance during the work week, which is lost over the weekend, causing symptoms to recur on Monday (hence "Monday morning fever"). * **Other Metals:** While Zinc is the most common, **Magnesium** and **Copper** can also cause similar syndromes. * **Diagnosis:** Primarily clinical; chest X-rays are usually normal. * **Treatment:** Supportive (bed rest and antipyretics); it is a self-limiting condition.

Practice by Chapter

Occupational Hazards: Classification

Practice Questions

Occupational Diseases

Practice Questions

Ergonomics

Practice Questions

Industrial Toxicology

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Occupational Cancers

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Work-Related Musculoskeletal Disorders

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Occupational Health Services

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Industrial Hygiene

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Assessment of Work Environment

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Personal Protective Equipment

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Occupational Health Legislation

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Workers' Compensation

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