Occupational Health — MCQs

Occupational Health Indian Medical PG Practice Questions and MCQs

Question 181: Byssinosis is seen in:

A. Textile industries (Correct Answer)
B. Cement factories
C. Grain fields
D. Iron factories

Explanation: ***Textile industries*** - Byssinosis is an occupational lung disease primarily affecting workers in **textile industries** who are exposed to cotton, flax, or hemp dust. - It is characterized by **chest tightness** and **shortness of breath**, particularly on the first day of the work week (Monday morning syndrome). *Cement factories* - Exposure in cement factories is primarily to **silica dust** and other irritants, which can lead to conditions like **silicosis**, but not byssinosis. - Silicosis is a chronic, progressive lung disease caused by the inhalation of crystalline silica. *Grain fields* - Workers in grain fields are exposed to **organic dusts**, molds, and mites, which can cause conditions like **farmer's lung** (hypersensitivity pneumonitis). - Farmer's lung is an allergic reaction to inhaled biological dusts from moldy hay or grain. *Iron factories* - Iron factory workers are mainly exposed to **iron oxide dust**, which can lead to **siderosis**, a benign pneumoconiosis. - Siderosis is usually asymptomatic and does not cause significant lung dysfunction.

Question 182: Improper handling of mercury in the clinic results in occupational hazard through:

A. Ingestion of contaminated food items
B. Contact with mercury-contaminated water
C. Inhalation of mercury vapors during amalgam preparation
D. Absorption of mercury through skin

Explanation: ***Inhalation of mercury vapors during amalgam preparation*** - **Inhalation is the PRIMARY route** of occupational mercury exposure in clinical settings, particularly dental clinics - Elemental mercury **vaporizes readily** at room temperature, and mercury vapor is rapidly absorbed through the lungs (>80% absorption rate) - Improper handling during **amalgam preparation, placement, or removal** releases significant mercury vapors - This is well-documented as the **major occupational hazard** for healthcare workers handling mercury (per NIOSH, OSHA, and WHO guidelines) - Can lead to chronic mercury poisoning with neurological, renal, and respiratory effects *Absorption of mercury through skin* - Intact skin provides an **effective barrier** to elemental mercury absorption - Only **negligible amounts** of elemental mercury are absorbed through intact skin - Skin absorption is primarily relevant for **organic mercury compounds** (like methylmercury), not the elemental mercury used in clinical settings - Even with spills on skin, inhalation of vapors remains the greater hazard *Ingestion of contaminated food items* - This route is associated with **methylmercury exposure** from contaminated fish, not occupational exposure to elemental mercury - **Not a typical occupational hazard** in clinical settings where mercury is handled - Represents environmental/dietary exposure rather than workplace exposure *Contact with mercury-contaminated water* - This is an **environmental concern** related to industrial pollution, not an occupational hazard in clinics - Not a significant route of exposure for healthcare workers handling mercury - Primarily involves methylmercury in aquatic ecosystems rather than elemental mercury in clinical settings

Question 183: Byssinosis is caused by:

A. Cotton (Correct Answer)
B. Bird droppings
C. Bagasse
D. Mold hay

Explanation: ***Cotton*** - **Byssinosis** is an occupational lung disease caused by the inhalation of **cotton dust** or dusts from other textile fibers like **flax** or **hemp**. - It classically presents as **chest tightness** and **dyspnea** upon re-exposure after a break, typically on the first day of the work week. *Bird droppings* - Inhalation of **bird droppings** can cause **extrinsic allergic alveolitis**, specifically known as **bird fancier's lung**. - This is a **hypersensitivity pneumonitis** rather than byssinosis. *Bagasse* - **Bagasse**, the fibrous residue left after crushing sugarcane, can cause **bagassosis** when inhaled. - Bagassosis is a form of **hypersensitivity pneumonitis**, distinct from byssinosis. *Mold hay* - Exposure to **moldy hay** containing thermophilic actinomycetes can lead to **farmer's lung**. - This is another form of **hypersensitivity pneumonitis**, characterized by sudden onset fever, chills, and dyspnea hours after exposure.

Question 184: Which of the following is an occupational lung disease but not a pneumoconiosis?

A. Silicosis
B. Brucellosis
C. Anthracosis
D. Byssinosis (Correct Answer)

Explanation: ***Byssinosis*** - This is an **occupational lung disease** seen in textile workers exposed to cotton, flax, or hemp dust, but it is **NOT a true pneumoconiosis**. - Unlike pneumoconioses which involve **irreversible fibrosis** from inorganic dust accumulation, byssinosis causes **reversible airway obstruction** and bronchospasm. - It presents with characteristic **chest tightness and dyspnea** that worsen on the **first day back at work** (Monday morning syndrome) and improve over the work week. - The pathophysiology involves **endotoxin-mediated bronchoconstriction**, not dust deposition leading to fibrosis. *Silicosis* - This is a classic **pneumoconiosis** caused by inhalation of **crystalline silica dust** in occupations like mining, sandblasting, and stone cutting. - It leads to **nodular fibrosis** and progressive lung damage from inorganic dust accumulation. *Anthracosis* - This is a **pneumoconiosis** resulting from inhalation of **coal dust**, commonly seen in coal miners. - It involves accumulation of carbon particles leading to pulmonary fibrosis (coal worker's pneumoconiosis). *Brucellosis* - While this is an **occupational infection** (veterinarians, farm workers, slaughterhouse workers), it is **not primarily a lung disease**. - It is a **systemic bacterial infection** caused by *Brucella* species affecting the reticuloendothelial system. - Main symptoms include undulant fever, sweats, arthralgia, and hepatosplenomegaly, not pulmonary manifestations.

Question 185: Monday fever is associated with

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

Explanation: ***Byssinosis*** - **Monday fever** is the pathognomonic feature of **byssinosis**, an occupational lung disease in textile workers exposed to **cotton, flax, or hemp dust**. - Workers experience **fever, chest tightness, and dyspnea on Monday** (the first day back after a weekend break) due to endotoxin-mediated bronchospasm. - Symptoms improve later in the week due to **tachyphylaxis** (tolerance development) and recur after time away from exposure. - This characteristic pattern distinguishes byssinosis from other occupational lung diseases. *Silicosis* - Chronic occupational lung disease caused by inhaling **crystalline silica dust** (mining, sandblasting, stone cutting). - Presents with **progressive pulmonary fibrosis**, chronic cough, dyspnea, and increased risk of tuberculosis. - Does **not** exhibit the "Monday fever" pattern. *Asbestosis* - Caused by inhaling **asbestos fibers**, resulting in diffuse interstitial pulmonary fibrosis. - Presents with progressive dyspnea, dry cough, and bibasilar crackles. - Does **not** show the characteristic Monday fever pattern. *Bagassosis* - **Extrinsic allergic alveolitis (hypersensitivity pneumonitis)** caused by inhaling dust from moldy **sugarcane bagasse**. - Presents with acute flu-like symptoms, fever, and dyspnea **4-8 hours after exposure**. - While it can cause fever, it is **not** specifically associated with the "Monday fever" pattern characteristic of byssinosis.

Question 186: The industry, with the highest accidental death rate and long held to be the most dangerous occupation is –

A. Trade
B. Mining and quarrying (Correct Answer)
C. Agriculture
D. Construction

Explanation: ***Mining and quarrying*** - This industry consistently ranks among the **most dangerous occupations** due to inherent risks like collapses, explosions, and confined spaces. - Workers face exposure to **toxic gases**, heavy machinery, and extreme conditions, leading to high rates of accidental deaths. *Trade* - The trade industry generally involves **less physical risk** and has significantly lower accidental death rates compared to heavy industries. - Common accidents are usually related to **slips, trips, falls**, or vehicle-related incidents, not severe industrial hazards. *Agriculture* - While agriculture can be dangerous due to **heavy machinery**, chemicals, and animal-related incidents, it typically has a lower overall accidental death rate than mining. - The type of hazards and their frequency differ from the highly acute and catastrophic nature of mining accidents. *Construction* - The construction industry is known for its high risk of injuries and fatalities, particularly from **falls, electrocution, and struck-by incidents**. - However, historical and statistical data consistently show that **mining and quarrying** have even higher accidental death rates due to the unique and severe hazards involved.

Question 187: Bagassosis is a pneumoconiosis caused by inhalation of

A. Cotton
B. Asbestos
C. Sugarcane dust (Correct Answer)
D. Coal particles

Explanation: ***Sugarcane dust*** - **Bagassosis** is a type of hypersensitivity pneumonitis caused by inhaling dust from **bagasse**, which is the fibrous residue left after sugarcane stalks are crushed to extract their juice. - Exposure to **thermophilic actinomycetes** and fungi growing on stored bagasse leads to an allergic inflammatory response in the lungs. *Cotton* - Inhalation of **cotton dust** can lead to **byssinosis**, a different occupational lung disease. - Byssinosis is characterized by **chest tightness** and shortness of breath that worsens on the first day of the work week. *Asbestos* - Inhalation of **asbestos fibers** causes serious diseases such as **asbestosis**, **mesothelioma**, and **lung cancer**. - These conditions are distinct from bagassosis in their pathology and causative agent. *Coal particles* - Inhalation of **coal dust** leads to **coal worker's pneumoconiosis (CWP)**, also known as "black lung disease." - CWP is characterized by nodular lesions in the lungs and is associated with mining occupations.

Question 188: Desks provided with a tabletop to prevent neck problems is an example of:

A. Specific protection (Correct Answer)
B. Primordial prevention
C. Disability limitation
D. Primary prevention

Explanation: ***Specific protection*** - Providing ergonomic desks with tabletops is a **targeted intervention to prevent a specific occupational health problem** (work-related neck pain and musculoskeletal disorders) - This falls under **specific protection**, a component of primary prevention that involves **specific measures to protect against particular diseases or injuries** - Ergonomic modifications in the workplace are considered specific protection measures as they directly prevent work-related musculoskeletal disorders (WRMDs) - Examples of specific protection: immunization, use of PPE, ergonomic workplace modifications, specific nutritional supplements *Primary prevention* - While technically correct (since specific protection IS a subset of primary prevention), this option is **too broad and less precise** - Primary prevention includes both health promotion (general measures) AND specific protection (targeted measures) - In exam context, when both a specific category and its broader parent category are options, the **more specific answer is preferred** - This question tests your ability to identify the precise level within primary prevention *Primordial prevention* - Aims to **prevent the emergence of risk factors** in the population through social, economic, and environmental changes - Example: Creating policies that discourage prolonged desk work or promote active workstations at a societal level - Providing desks is addressing an existing risk (prolonged desk work), not preventing the risk factor itself *Disability limitation* - Part of **tertiary prevention** that aims to reduce complications and disability **after disease has occurred** - Example: Physiotherapy and workplace modifications for workers who already have chronic neck pain - The question specifies prevention (before disease occurs), not rehabilitation after disease onset

Question 189: Rajiv Gandhi Shramik Kalyan Yojana is associated with:

A. Support for workers injured during their duty
B. Provision of training for employees
C. Provision of unemployment allowance (Correct Answer)
D. Provision of jobs for widows of employees covered under ESI scheme

Explanation: ***Provision of unemployment allowance*** - The **Rajiv Gandhi Shramik Kalyan Yojana** is an initiative by the Employees' State Insurance Corporation (ESIC) to provide **unemployment allowance** to insured persons who lose their jobs due to various circumstances. - This scheme offers financial support to workers during periods of **involuntary unemployment**, helping them manage living expenses while seeking new employment. *Support for workers injured during their duty* - While ESIC does provide benefits for **work-related injuries**, this specific scheme is not primarily focused on that aspect. - **Employee compensation insurance** typically covers medical expenses and disability benefits for occupational injuries. *Provision of training for employees* - Employee training and skill development programs are distinct from the purpose of the Rajiv Gandhi Shramik Kalyan Yojana. - Such programs are usually aimed at enhancing **employability** or **productivity**, not directly addressing unemployment benefits. *Provision of jobs for widows of employees covered under ESI scheme* - While ESIC provides support to families of deceased insured persons, this scheme is not specifically about providing employment opportunities for widows. - Other ESIC benefits, such as **dependent benefits**, focus on financial assistance to family members.

Question 190: Exposure to cotton dust in a textile factory causes

A. Anthracosis
B. Bagassosis
C. Silicosis
D. Byssinosis (Correct Answer)

Explanation: ***Byssinosis*** - **Byssinosis** is a chronic occupational lung disease caused by inhaling **cotton dust**, specifically in textile workers. - Symptoms usually include chest tightness, shortness of breath, and cough, particularly noticeable on the first day back to work after a break. *Anthracosis* - **Anthracosis** is a lung condition resulting from the inhalation of **coal dust**, commonly seen in coal miners. - It is often asymptomatic but can progress to more severe forms of **pneumoconiosis** in heavy exposures. *Bagassosis* - **Bagassosis** is a hypersensitivity pneumonitis caused by inhaling dust from **bagasse**, which is the fibrous residue left after crushing sugarcane. - It is an allergic reaction to thermophilic fungi present in moldy bagasse. *Silicosis* - **Silicosis** is a fibrotic lung disease caused by inhaling **crystalline silica** dust, typically found in occupations like mining, quarrying, and construction. - It leads to the formation of characteristic **silicotic nodules** in the lungs.

Practice by Chapter

Occupational Hazards: Classification

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Occupational Diseases

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Ergonomics

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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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