Occupational Health — MCQs

Consider the following statements regarding needle stick injuries: 1. Injured part should be washed under running water 2. Dominant index finger is the commonest site for needle stick injury 3. All needle stick injuries should be reported 4. Hepatitis/HIV testing should be done after needle stick injury Which of the statements given above are correct?

Q177

The most common mode of absorption of inorganic lead in industries leading to lead poisoning is:

Q178

Anthracosis is caused by:

Q179

The carcinogenic chemical that has a very long latent period is –

Q180

Anthracosis is caused by -

Occupational Health Indian Medical PG Practice Questions and MCQs

Question 171: By applying the principles of ergonomics which of the following can be improved? 1. Designing of equipment and tools 2. Human efficiency 3. Layout of place of work 4. Reduction in industrial accidents Select the correct answer using the code given below:

A. 1, 3 and 4 only
B. 2, 3 and 4 only
C. 1, 2, 3 and 4 (Correct Answer)
D. 1, 2 and 3 only

Explanation: ***1, 2, 3 and 4*** - **Ergonomics** is the science of designing and arranging workplaces, products, and systems so that they fit the people who use them, thereby improving **human efficiency**, safety, and comfort. - By optimizing the interaction between humans and their work environment, ergonomics directly impacts the **design of equipment and tools**, the **layout of the workplace**, and significantly contributes to the **reduction of industrial accidents**. *1, 3 and 4 only* - This option incorrectly excludes **human efficiency** as an outcome of applying ergonomic principles. - A primary goal of ergonomics is to enhance human performance and well-being, which directly translates to improved efficiency. *2, 3 and 4 only* - This option incorrectly excludes the **designing of equipment and tools** from the benefits of ergonomics. - Ergonomics is fundamentally applied in the design phase to ensure tools and equipment are user-friendly, safe, and effective. *1, 2 and 3 only* - This option incorrectly excludes the **reduction in industrial accidents** as a benefit of ergonomics. - By designing safer interfaces and work environments, ergonomics plays a crucial role in preventing workplace injuries and accidents.

Question 172: Farmer's lung is caused by the inhalation of:

A. Cotton fibre dust
B. Sugarcane dust
C. Grain dust with actinomycetes (Correct Answer)
D. Silica dust

Explanation: ***Grain dust with actinomycetes*** - **Farmer's lung** is a type of **hypersensitivity pneumonitis** caused by inhaling dust from moldy hay or other agricultural products contaminated with **thermophilic actinomycetes**. - These bacteria trigger an immune response in the lungs, leading to inflammation and respiratory symptoms. *Cotton fibre dust* - Inhalation of **cotton fiber dust** is associated with **byssinosis**, a different occupational lung disease. - Byssinosis typically presents with chest tightness and shortness of breath, often worse on the first day of the work week. *Sugarcane dust* - Exposure to **sugarcane dust** can lead to **bagassosis**, another form of hypersensitivity pneumonitis. - While similar in mechanism to farmer's lung, the specific antigen is different (from sugarcane rather than moldy hay). *Silica dust* - Inhalation of **silica dust** causes **silicosis**, a chronic, progressive occupational lung disease characterized by pulmonary fibrosis. - Silicosis is common in miners, quarry workers, and others exposed to silica, and it is not a hypersensitivity reaction but a direct fibrotic response.

Question 173: Occupational exposure to Benzol may lead to :

A. Leukaemia (Correct Answer)
B. COPD
C. Neurofibromas
D. Lung cancer

Explanation: ***Leukaemia*** - **Benzene** (often referred to as Benzol) is a known **hematologic carcinogen** that primarily targets the bone marrow. - Exposure to benzene significantly increases the risk of developing **acute myeloid leukemia (AML)**, and to a lesser extent, other leukemias and myelodysplastic syndromes. *COPD* - **Chronic obstructive pulmonary disease (COPD)** is primarily associated with **smoking** and exposure to occupational dusts and chemicals, but not specifically linked as a direct consequence of benzene exposure. - While some occupational exposures can contribute to COPD, benzene's most significant and well-documented effect is on the **hematopoietic system**. *Neurofibromas* - **Neurofibromas** are benign tumors that arise from **peripheral nerve sheath cells**, a hallmark of **neurofibromatosis type 1 (NF1)**, a genetic disorder. - There is no established link between occupational exposure to **benzene** and the development of neurofibromas. *Lung cancer* - While many occupational exposures, especially to carcinogens like **asbestos** or **radon**, are linked to lung cancer, **benzene** is not a primary or significant cause. - **Smoking** is the leading cause of lung cancer, and while some industrial chemicals can cause lung malignancy, benzene's main carcinogenic effect is on **blood-forming cells**.

Question 174: Caisson’s disease is usually seen in which group of workers?

A. Workers in manufacture of gas
B. Workers in radiation units
C. Construction workers under sea level (Correct Answer)
D. Cotton field agricultural workers

Explanation: ***Construction workers under sea level*** - **Caisson's disease**, also known as **decompression sickness** or **the bends**, occurs when individuals experience a rapid decrease in surrounding pressure. - Workers such as **divers, underwater construction workers, and tunnel builders** often work in high-pressure environments and are at risk if they ascend too quickly. *Workers in manufacture of gas* - While gas manufacturing can involve exposure to various chemicals and potential respiratory hazards, it does not typically involve the significant changes in **ambient pressure** that cause Caisson's disease. - This profession is not associated with the **rapid decompression** necessary for nitrogen bubbles to form in tissues. *Workers in radiation units* - Workers in radiation units are at risk of conditions related to **ionizing radiation exposure**, such as cancer or radiation sickness. - Their work environment does not involve changes in **pressure** that lead to Caisson's disease. *Cotton field agricultural workers* - Agricultural workers in cotton fields may suffer from respiratory conditions like **byssinosis** ("brown lung") due to cotton dust exposure. - Their work environment does not involve **hyperbaric conditions** or rapid decompression, which are prerequisites for Caisson's disease.

Question 175: Which one of the following occupational diseases is the most common cause of permanent disability and mortality?

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

Explanation: ***Silicosis*** - **Silicosis** is the **most common serious occupational lung disease worldwide**, caused by inhaling **crystalline silica dust** from mining, quarrying, stone-cutting, and construction work. - It leads to **progressive massive fibrosis** with severe impairment of lung function, resulting in the **highest global burden of occupational disability and mortality** among pneumoconioses. - Particularly prevalent in **developing countries** including India, where exposure remains widespread in unregulated industries. - Increases risk of **tuberculosis, COPD, and lung cancer**, further contributing to mortality. *Byssinosis* - Caused by exposure to **cotton dust** in textile workers, leading to chest tightness and airway obstruction. - Generally **reversible in early stages** if exposure is eliminated. - Significantly **lower rates of permanent disability and mortality** compared to silicosis. *Anthracosis* - Also known as **coal worker's pneumoconiosis**, caused by inhaling coal dust. - Can progress to complicated pneumoconiosis, but is generally **less fibrogenic than silicosis**. - Lower global prevalence due to improved mining safety and decline of coal mining in many regions. *Asbestosis* - Caused by inhaling **asbestos fibers**, leading to diffuse pulmonary fibrosis. - While highly serious and associated with **mesothelioma and lung cancer**, its prevalence has **decreased significantly** due to asbestos bans in many countries. - Silicosis surpasses it in **overall global burden** due to continued widespread silica exposure.

Question 176: Consider the following statements regarding needle stick injuries: 1. Injured part should be washed under running water 2. Dominant index finger is the commonest site for needle stick injury 3. All needle stick injuries should be reported 4. Hepatitis/HIV testing should be done after needle stick injury Which of the statements given above are correct?

A. 1, 2 and 3
B. 1, 3 and 4 (Correct Answer)
C. 1, 2 and 4
D. 2, 3 and 4

Explanation: ***1, 3 and 4*** - All **needle stick injuries** expose healthcare workers to potential bloodborne pathogens, making immediate action, reporting, and testing crucial for **risk assessment** and **post-exposure prophylaxis**. - **Washing the injured part** helps reduce pathogen load, reporting ensures proper investigation and documentation, and testing helps monitor for infection and guide treatment. *1, 2 and 3* - While statements 1 and 3 are correct, statement 2, claiming the **dominant index finger** is the commonest site, is generally incorrect; the **non-dominant hand** is often at higher risk during procedures. - Furthermore, statement 4 regarding **Hepatitis/HIV testing** is a critical component of post-exposure management that is omitted from this option. *1, 2 and 4* - Statements 1 and 4 are correct, but as noted, statement 2 about the **dominant index finger** being the commonest site is typically false, with **non-dominant hand** injuries being more frequent. - This option also incorrectly omits the essential step of **reporting all needle stick injuries**, which is vital for surveillance and appropriate follow-up. *2, 3 and 4* - This option incorrectly includes the statement that the **dominant index finger** is the commonest site for needle stick injury. - It also fails to include the crucial first step of immediately **washing the injured part** under running water, which is fundamental to initial management.

Question 177: The most common mode of absorption of inorganic lead in industries leading to lead poisoning is:

A. Inhaled lead dust (Correct Answer)
B. Ingestion of contaminated food and water
C. Contaminated hands
D. Absorption through skin

Explanation: ***Inhaled lead dust*** - In industrial settings, **inorganic lead** is frequently present as fine airborne particles, making inhalation the primary route of exposure and absorption. - **Lead dust** generated from processes like smelting, battery manufacturing, and construction (e.g., sanding lead paint) can be readily absorbed through the respiratory tract. *Ingestion of contaminated food and water* - While ingestion of **contaminated food and water** is a significant route of lead exposure, especially in children, it is generally less common than inhalation in occupational settings where lead dust is prevalent. - This route is more typically associated with environmental contamination rather than direct industrial absorption. *Contaminated hands* - **Contaminated hands** pose a risk primarily through transfer of lead to the mouth and subsequent ingestion, rather than direct absorption through the skin itself. - This is an indirect route of internal exposure, often secondary to handling lead-containing materials without proper hygiene. *Absorption through skin* - **Inorganic lead** (the type commonly found in industrial settings) is very poorly absorbed through intact skin. - **Organic lead compounds** (e.g., tetraethyl lead), which are less common in general industries, are much more readily absorbed cutaneously.

Question 178: Anthracosis is caused by:

A. Sugar cane waste
B. Asbestos
C. Silica
D. Coal dust (Correct Answer)

Explanation: ***Coal dust*** - **Anthracosis** is a lung condition resulting from the accumulation of **coal dust** particles in the lungs. - It is a common finding in coal miners, hence the term **coal worker's pneumoconiosis**. *Sugar cane waste* - Inhalation of **sugar cane waste** can lead to **bagassosis**, a form of hypersensitivity pneumonitis. - Bagassosis is caused by an immunological reaction to organic dust, not inert particle build-up like anthracosis. *Asbestos* - Exposure to **asbestos** fibers causes **asbestosis**, a severe fibrotic lung disease. - Asbestosis is also linked to an increased risk of lung cancer and **mesothelioma**. *Silica* - Inhalation of **crystalline silica** dust results in **silicosis**, characterized by lung nodule formation and fibrosis. - Occupations involving mining, quarrying, and construction are at high risk for silicosis.

Question 179: The carcinogenic chemical that has a very long latent period is –

A. Benzopyrene
B. Asbestos (Correct Answer)
C. Vinyl chloride
D. Estrogens

Explanation: ***Asbestos*** - Asbestos exposure is famously associated with a **very long latent period** (often 20-50 years) before the development of cancers like **mesothelioma** and lung cancer. - This characteristic makes it challenging to link past exposure directly to current disease, leading to significant public health and legal implications. *Benzopyrene* - Benzopyrene (a polycyclic aromatic hydrocarbon found in cigarette smoke and industrial emissions) is a potent carcinogen, but its latency period, while significant, is generally shorter than that of asbestos. - It is primarily associated with **lung cancer** and other cancers related to direct exposure. *Vinyl chloride* - Vinyl chloride is a well-known carcinogen, primarily implicated in **hepatic angiosarcoma**; however, its latent period is typically shorter than that observed with asbestos exposure. - Exposure is usually occupational, and the associated cancers often manifest within 10-20 years. *Estrogens* - Estrogens, particularly prolonged or unopposed exposure (e.g., in some hormone replacement therapies or conditions like obesity), are linked to an increased risk of **endometrial** and **breast cancers**. - While these cancers have latent periods, they are generally not as exceptionally long as those associated with asbestos.

Question 180: Anthracosis is caused by -

A. Cotton dust
B. Silica
C. Iron
D. Coal dust (Correct Answer)

Explanation: ***Coal dust*** - **Anthracosis** is a lung disease specifically caused by the inhalation of **coal dust** particles. - It's a form of **pneumoconiosis**, often seen in coal miners, which leads to blackening of lung tissue due to carbon deposition. *Cotton dust* - Inhalation of **cotton dust** primarily causes **byssinosis**, a respiratory condition characterized by chest tightness and shortness of breath, especially on the first day of the work week. - It does not lead to the carbon deposition seen in anthracosis. *Silica* - Inhalation of **silica** dust causes **silicosis**, a fibrotic lung disease characterized by the formation of silica nodules and progressive massive fibrosis. - It is distinct from anthracosis, which involves carbon rather than silica particles. *Iron* - Inhalation of **iron** dust or fumes can lead to **siderosis**, where iron particles accumulate in the lungs. - While it can appear radiographically similar to other pneumoconioses, it is generally considered a benign condition and does not typically cause the fibrous reaction seen with other dusts, nor is it related to carbon.

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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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