Occupational Health — MCQs

Occupational Health Indian Medical PG Practice Questions and MCQs

Question 211: What is the optimal intervention for a construction worker who shows a 4000 Hz dip in pure tone audiometry (PTA)?

A. Mandatory ear protection, regular assessments (Correct Answer)
B. No immediate action needed
C. Reassign to quieter environment
D. Suggest early retirement

Explanation: ***Mandatory ear protection, regular assessments*** - A **4000 Hz dip** in pure tone audiometry is a classic sign of **noise-induced hearing loss (NIHL)**, common in noise-exposed occupations like construction. - **Mandatory ear protection** prevents further damage, and **regular assessments** monitor the progression and effectiveness of interventions, ensuring the worker's continued safety in their current role. *No immediate action needed* - This option is incorrect because a **4000 Hz dip** indicates significant, often irreversible, hearing damage, requiring immediate intervention to prevent further loss. - Delaying action can lead to worsening hearing loss, affecting the worker's quality of life and work capability. *Reassign to quieter environment* - While beneficial, reassigning to a quieter environment might not always be feasible or necessary as the initial step, especially if the worker's current role can be made safe with proper hearing protection. - This step should be considered if protection fails or if the hearing loss is severe and impacts job performance. *Suggest early retirement* - This is an extreme and premature measure, as appropriate interventions like **ear protection** and **regular monitoring** can often allow the worker to continue their career safely. - Early retirement would only be considered if all other protective and adaptive measures fail and continued work poses an unacceptable health risk.

Question 212: Which of the following diseases is most strongly associated with exposure to asbestos?

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

Explanation: ***Asbestosis*** - **Asbestosis** is a chronic lung disease caused by inhaling **asbestos fibers**, leading to diffuse interstitial fibrosis. - Exposure to asbestos is the direct and primary cause of this specific condition, as reflected in its name. *Silicosis* - **Silicosis** is a lung disease resulting from the inhalation of **crystalline silica dust**, commonly seen in mining, quarrying, and sandblasting. - It is not directly linked to asbestos exposure but rather to silica exposure. *Byssinosis* - **Byssinosis** is an occupational lung disease caused by exposure to dust from **cotton, flax, or hemp**, primarily affecting textile workers. - Symptoms include chest tightness and shortness of breath, which improve on days away from exposure, and it is unrelated to asbestos. *Anthracosis* - **Anthracosis** is the accumulation of **carbon dust** in the lungs, typically from inhaling smoke or coal dust, and is a component of coal worker's pneumoconiosis. - While it involves dust inhalation, it is not specifically associated with asbestos exposure.

Question 213: A factory is setting up measures to prevent occupational lung disease among its workers. What is the most important primary prevention strategy?

A. Regular health check-ups
B. Use of personal protective equipment (Correct Answer)
C. Medical treatment
D. Lifestyle modification

Explanation: ***Use of personal protective equipment*** - **Primary prevention** aims to prevent a disease or injury before it ever occurs, and in the context of occupational lung disease, this means preventing exposure to harmful agents. - **Personal protective equipment (PPE)**, such as respirators and masks, directly reduces the inhalation of airborne particles and chemicals, thus preventing lung damage. *Regular health check-ups* - **Regular health check-ups** are a form of **secondary prevention**, as they aim for early detection of a disease after it has begun, but before symptoms appear. - While important for monitoring health, check-ups do not prevent the initial exposure that causes occupational lung disease. *Medical treatment* - **Medical treatment** is a form of **tertiary prevention**, focusing on managing an existing disease to slow its progression and improve quality of life. - It addresses symptoms or established disease, rather than preventing its onset. *Lifestyle modification* - **Lifestyle modifications** are generally related to personal choices (e.g., smoking cessation, diet) that impact overall health but do not directly prevent exposure to occupational hazards. - While good for general health, they are not the primary means of preventing an occupational lung disease caused by workplace exposure.

Question 214: What type of prevention does the new policy requiring all workers to use hearing protection in noisy areas represent?

A. Primary prevention (Correct Answer)
B. Secondary prevention
C. Tertiary prevention
D. Quaternary prevention

Explanation: ***Primary prevention*** - **Primary prevention** aims to prevent disease or injury before it ever occurs. Requiring hearing protection prevents noise-induced hearing loss from developing. - This level of prevention involves **health promotion** and specific protection measures, such as safety policies and vaccinations. *Secondary prevention* - **Secondary prevention** focuses on early detection and prompt treatment of existing health problems to prevent them from worsening. - Examples include **screening tests** like mammograms or blood pressure checks, not preventing the initial exposure or harm. *Tertiary prevention* - **Tertiary prevention** aims to reduce the impact of an ongoing disease or injury that has lasting effects and restore functionality. - This includes **rehabilitation**, chronic disease management, and support groups for conditions that have already developed. *Quaternary prevention* - **Quaternary prevention** is about identifying individuals at risk of overmedicalization and protecting them from medical interventions that are likely to do more harm than good. - It involves avoiding **unnecessary medical procedures** or treatments and promoting evidence-based care.

Question 215: A 40-year-old male presents with symptoms of chronic bronchitis after working in a factory for the past 15 years. What is the most likely occupational exposure?

A. Silica
B. Coal dust
C. Dust and fumes (Correct Answer)
D. Asbestos

Explanation: ***Dust and fumes*** - Exposure to **dusts and fumes** in an occupational setting, especially over 15 years in a factory, is a common cause of **chronic bronchitis**. - These irritants cause inflammation and mucus hypersecretion in the airways, leading to the characteristic cough and sputum production of chronic bronchitis. - Common sources include **industrial processes, welding fumes, chemical vapors**, and various particulate matter in manufacturing environments. *Silica* - **Silica exposure** is primarily associated with **silicosis**, a fibrotic lung disease characterized by nodular fibrosis in the upper lobes. - While prolonged silica exposure can cause respiratory symptoms, its hallmark is **progressive massive fibrosis** and restrictive lung disease, rather than the obstructive pattern of chronic bronchitis. - Silicosis typically presents with progressive dyspnea and is diagnosed by characteristic radiological findings. *Coal dust* - **Coal dust exposure** primarily causes **coal worker's pneumoconiosis (CWP)**, characterized by coal macule formation and progressive massive fibrosis. - While coal dust can contribute to chronic bronchitis, the primary occupational disease is CWP, which presents as a restrictive or mixed pattern lung disease. - The question context of a general factory setting makes mixed dust and fumes more likely than specific coal dust exposure. *Asbestos* - **Asbestos exposure** is linked to specific conditions like **asbestosis**, **mesothelioma**, and lung cancer. - Asbestosis causes **pulmonary fibrosis** with bilateral lower lobe reticular opacities and restrictive lung disease, which differs from the obstructive airway disease seen in chronic bronchitis. - Pleural plaques and calcification are characteristic radiological findings of asbestos exposure.

Question 216: A factory has reported multiple cases of dermatitis among its workers. Which measure is most effective in preventing occupational skin diseases?

A. Providing personal protective equipment (Correct Answer)
B. Regular health check-ups
C. Implementing hygiene education programs
D. Improving workplace ventilation

Explanation: ***Providing personal protective equipment*** **Personal protective equipment (PPE)** such as gloves, masks, and protective clothing creates a direct barrier, effectively preventing skin exposure to **irritants** and **allergens** responsible for occupational dermatitis. By reducing direct contact, PPE significantly lowers the risk of developing **sensitization** and subsequent **dermatitis**, especially in environments with chemical or physical hazards. *Regular health check-ups* While important for early detection and management, **regular health check-ups** do not prevent the initial exposure or onset of occupational skin diseases. They serve more as a **monitoring** and **diagnostic** tool rather than a primary preventive measure against specific dermal conditions. *Implementing hygiene education programs* **Hygiene education programs** promote good practices like handwashing, which can reduce the spread of contaminants and mild irritations. However, education alone may not suffice to prevent dermatitis from strong or direct exposure to **hazardous substances** if physical barriers like PPE are not in place. *Improving workplace ventilation* **Improved workplace ventilation** primarily reduces the concentration of **airborne irritants** and **inhalable toxins**, which helps prevent respiratory issues rather than direct skin contact dermatitis. It offers limited protection against substances that come into direct contact with the skin, such as liquids, powders, or tools contaminated with allergens.

Question 217: What is the average annual permissible level of occupational exposure to radiation?

A. 10 rad
B. 50 rad
C. 5 rad
D. 2 rad. (Correct Answer)

Explanation: ***2 rad*** - This value, expressed as **2 rem** (roentgen equivalent man) or **20 mSv** (millisieverts) per year, is the internationally recommended average annual occupational dose limit for the whole body, averaged over 5 years. - According to ICRP (International Commission on Radiological Protection) guidelines, the occupational dose limit is 100 mSv in 5 years (averaging 20 mSv per year), with no single year exceeding 50 mSv. - This limit aims to minimize the risk of stochastic effects (e.g., cancer) and prevent deterministic effects (e.g., radiation sickness). *5 rad* - While **5 rem (50 mSv)** is the maximum dose permitted in a single year for occupational exposure, it is not the average annual permissible level. - The international standard emphasizes averaging 20 mSv per year over 5 years to manage long-term risk. *10 rad* - **10 rem (100 mSv)** is significantly higher than the recommended average annual occupational exposure limit and would be considered an unacceptably high dose in normal circumstances. - Doses of this magnitude are typically associated with higher risks of adverse health effects. *50 rad* - **50 rem (500 mSv)** is an extremely high level of radiation exposure and would lead to immediate and severe health consequences, including acute radiation syndrome, if received as a single dose. - This level is far beyond any permissible occupational exposure limit.

Question 218: Which occupation is historically linked to an increased risk of developing scrotal carcinoma?

A. Chimney sweeps (Correct Answer)
B. Textile workers
C. Construction workers
D. Miners

Explanation: ***Chimney sweeps*** - This occupation was historically associated with a high incidence of **scrotal carcinoma** due to exposure to **soot**, which contains polycyclic aromatic hydrocarbons (PAHs). - Percival Pott's observation in 1775 was one of the first links between an occupation and cancer, highlighting the carcinogenic effects of prolonged contact with specific chemicals. *Textile workers* - While some textile occupations have been linked to respiratory issues (e.g., **byssinosis** from cotton dust) or bladder cancer from certain dyes, they are not historically associated with an increased risk of scrotal carcinoma. - The primary carcinogens for textile workers typically differ from those causing scrotal cancer. *Construction workers* - Construction workers can be exposed to various hazards, including **asbestos** (mesothelioma, lung cancer) and silica (silicosis, lung cancer). - However, there is no historical or strong epidemiological link between general construction work and scrotal carcinoma specifically. *Miners* - Miners are primarily at risk for **respiratory diseases** (e.g., pneumoconiosis, lung cancer from radon or coal dust) and other cancers depending on the specific minerals and methods involved. - While some mining activities involve carcinogens, scrotal carcinoma is not a historically prominent cancer risk for this occupational group.

Question 219: What is the minimum air space recommended for a worker according to the Factories Act?

A. 1000 Cu ft
B. 500 Cu ft (Correct Answer)
C. 200 Cu ft
D. 100 Cu ft

Explanation: ***500 Cu ft*** - The **Factories Act** in many jurisdictions specifies a minimum airspace of **500 cubic feet** per worker to ensure adequate ventilation and prevent overcrowding. - This regulation aims to maintain a healthy and safe working environment by providing sufficient oxygen and reducing the concentration of airborne pollutants. *1000 Cu ft* - While a larger airspace would be beneficial, **1000 cubic feet** is not the mandated minimum under the Factories Act. - This value is significantly higher than the legal requirement and would place a disproportionate burden on industrial setups. *200 Cu ft* - An airspace of **200 cubic feet** per worker is considerably less than the recommended minimum. - This amount would be inadequate for proper ventilation and would likely lead to poor air quality and potential health hazards. *100 Cu ft* - **100 cubic feet** per worker is far below the acceptable standard and would result in extremely cramped and unsanitary conditions. - Such limited space would severely compromise worker health and safety, violating fundamental occupational health regulations.

Question 220: What type of cancer is associated with exposure to hardwood dust?

A. Nasal adenocarcinoma (Correct Answer)
B. Skin cancer
C. Liver cancer
D. Bladder cancer

Explanation: ***Nasal adenocarcinoma*** - Exposure to **hardwood dust**, particularly in professions like carpentry or furniture making, is a well-established occupational risk factor for **nasal adenocarcinoma**. - The fine dust particles become trapped in the **nasal passages**, leading to chronic irritation and cellular changes that can progress to malignancy. *Skin cancer* - While various environmental factors, including **UV radiation**, are major causes of skin cancer, hardwood dust exposure is not a primary risk factor for its development. - Skin cancers are generally more associated with direct exposure to carcinogens or radiation on the skin surface. *Liver cancer* - Liver cancer is primarily associated with risk factors such as **chronic viral hepatitis (HBV, HCV)**, alcohol abuse, **non-alcoholic fatty liver disease**, and exposure to certain toxins like aflatoxins. - There is no significant epidemiological link between hardwood dust exposure and liver cancer. *Bladder cancer* - The main risk factors for bladder cancer include **smoking**, occupational exposure to certain aromatic amines (e.g., in dyes and rubber industries), and chronic bladder irritation. - Hardwood dust exposure is not recognized as a direct cause of bladder cancer.

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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