Environmental Health Practice Questions

Q: Which agency monitors air quality in India?

Central pollution control board. ***Central pollution control board*** - The **Central Pollution Control Board (CPCB)** is responsible for setting standards and monitoring air quality across India. - It works under the **Ministry of Environment, Forest and Climate Change (MoEFCC)**. *Central air quality board* - There is **no specific agency** or board named "Central Air Quality Board" in India. - Air quality monitoring falls under the broader mandate of pollution control. *Central public works dept* - The **Central Public Works Department (CPWD)** is primarily involved in the construction and maintenance of government buildings and infrastructure. - It does **not have a mandate** for environmental monitoring like air quality. *None of the options* - This option is incorrect because the **Central Pollution Control Board** is the correct agency responsible for air quality monitoring. - There is a specific statutory organization fulfilling this role.

Q: Which of the following is not a source of environmental radiation?

CO. ***CO*** - **Carbon monoxide (CO)** is a toxic gas produced by incomplete combustion, but it is **not radioactive** and thus not a source of environmental radiation. - Its danger comes from its ability to bind to **hemoglobin**, preventing oxygen transport, not from emitting radiation. *Radium* - **Radium** is a highly **radioactive element** found naturally in the environment as a decay product of uranium and thorium. - It emits **alpha and gamma radiation**, contributing significantly to natural background radiation. *Uranium* - **Uranium** is a naturally occurring **radioactive element** found in rocks, soil, and water. - It decays through a series of steps, emitting **alpha, beta, and gamma radiation**, and is a primary source of environmental background radiation. *Radon* - **Radon** is a **radioactive gas** that is formed from the decay of uranium in soil and rocks. - It is a significant source of **indoor environmental radiation exposure** and a known cause of lung cancer.

Q: In waste management, organic load is measured by which of the following?

Biological oxygen demand. ***Biological oxygen demand (BOD)*** - BOD is the **standard and primary measure of organic load** in waste management and wastewater treatment. - It measures the amount of **dissolved oxygen consumed by microorganisms** while decomposing biodegradable organic matter in water over a specific period (typically 5 days at 20°C - BOD₅). - Directly reflects the **biodegradable organic pollution** in wastewater and is the **gold standard** for assessing organic load in environmental health monitoring. - Used worldwide for **regulatory compliance** and treatment plant performance evaluation. *Chemical oxygen demand (COD)* - Measures the total quantity of oxygen required to **oxidize all organic AND inorganic compounds** in water chemically. - Gives **higher values than BOD** because it includes non-biodegradable substances and inorganic matter. - Useful as a **supplementary test** and provides faster results, but **does not specifically measure organic load alone**. - COD/BOD ratio helps assess biodegradability of wastewater. *Suspended solid* - Refers to particles suspended in water that **will not pass through a filter**. - Represents **physical impurities** rather than a direct measure of organic load. - Can carry organic material but is not a biochemical measure of organic pollution. *Total dissolved solids* - Measures all **inorganic and organic substances** dissolved in water. - Not a specific measure of organic load but rather overall water quality parameter.

Q: What is the best type of incinerator for the disposal of infectious waste?

Double-chamber incinerator. ***Double-chamber incinerator*** - A **double-chamber incinerator** is considered the most appropriate for infectious waste disposal as it allows for complete combustion. - The primary chamber burns the waste, and the secondary chamber burns the remaining gases and particulates, ensuring effective sterilization and minimizing harmful emissions. *Single-chamber incinerator* - **Single-chamber incinerators** are generally not recommended for infectious waste. - They often result in incomplete combustion, leading to the release of harmful emissions and potentially viable pathogens. *Triple-chamber incinerator* - While sometimes used, a **triple-chamber incinerator** is usually overkill and more complex than necessary for routine infectious waste. - The additional chamber significantly increases complexity and operating costs without substantial further benefits over a well-designed double-chamber system for this specific purpose. *No incinerator* - Disposing of infectious waste without an incinerator or other high-heat treatment method poses significant public health and environmental risks due to the potential spread of pathogens. - Other methods like autoclaving or chemical disinfection are used for specific types of infectious waste, but incineration remains a key method for overall disposal.

Q: What percentage of waste generated in hospitals is considered infectious?

15-20% of waste is infectious. ***15-20% of waste is infectious*** - This is the **correct answer** as per WHO guidelines and standard biomedical waste management protocols. - Approximately **10-25% of hospital waste is classified as hazardous**, which includes infectious, pathological, sharps, chemical, pharmaceutical, and radioactive waste. - The remaining **75-90% is non-hazardous general waste** similar to domestic waste, including paper, packaging, food waste, and administrative materials. - Proper **waste segregation** is crucial to prevent mixing of infectious waste with general waste, which would unnecessarily increase handling and disposal costs. *65% of waste is infectious* - This is **incorrect** as it grossly overestimates the proportion of infectious waste. - Only a **minority of hospital waste is hazardous/infectious**, not the majority. - Such a high percentage would indicate poor waste segregation practices. *80% of waste is infectious* - This is **incorrect** and represents a severe overestimation. - The vast majority of hospital waste is actually **non-hazardous general waste**. - This misconception can lead to unnecessary treatment of general waste, increasing costs. *100% of waste is infectious* - This is **completely incorrect** and contradicts all biomedical waste management guidelines. - Hospitals generate significant amounts of **general administrative and domestic waste** that is not infectious. - Treating all waste as infectious would be economically unsustainable and environmentally unnecessary.

Q: What is the primary objective of the Pradhan Mantri Ujjwala Yojana (PMUY)?

Providing clean cooking fuel to rural women. ***Providing clean cooking fuel to rural women*** - The Pradhan Mantri Ujjwala Yojana (PMUY), launched in **May 2016**, aims to provide **LPG connections to women from Below Poverty Line (BPL) households**. - The primary objective is to **safeguard the health of women and children** by replacing traditional cooking fuels like **firewood, coal, and cow dung cakes** with clean LPG. - This reduces **indoor air pollution** and associated health hazards, particularly respiratory diseases and eye problems. - The scheme also aims to **empower women** and reduce the drudgery of collecting firewood. *Providing employment opportunities* - This is **not the objective** of PMUY, which is focused on **clean cooking fuel access** and **public health**. - Employment generation is the focus of other schemes like **MGNREGA** and **Pradhan Mantri Kaushal Vikas Yojana**. *Reducing child trafficking* - Child trafficking is addressed by schemes like **Integrated Child Protection Scheme (ICPS)** and not by PMUY. - PMUY specifically deals with **LPG access** and **clean cooking fuel**. *Promoting digital literacy among women* - Digital literacy is promoted through schemes like **Pradhan Mantri Gramin Digital Saksharta Abhiyan (PMGDISHA)**. - PMUY's focus is exclusively on providing **clean cooking fuel** through LPG connections.

Q: In winter, water vapours and pollutants come to lie in the lowermost layer of atmosphere by -?

Temperature inversion. ***Temperature inversion*** - **Temperature inversion** is an atmospheric phenomenon where a layer of cool air at the surface is trapped beneath a layer of warmer air. - This stable condition prevents the normal vertical mixing of air, causing pollutants and water vapors to accumulate in the lowest layer of the atmosphere, leading to conditions like **smog** and **fog**. *Acid rain* - **Acid rain** refers to precipitation (rain, snow, fog, etc.) that contains elevated levels of nitric and sulfuric acids. - It results from the emissions of sulfur dioxide and nitrogen oxides into the atmosphere, which then react with water, oxygen, and other chemicals, rather than directly causing pollutants to lie in the lowermost layer. *Greenhouse effect* - The **greenhouse effect** is a natural process where certain gases in Earth's atmosphere trap heat, warming the planet. - While it affects global temperatures, it does not directly explain the specific phenomenon of pollutants and water vapors being trapped in the lowermost atmospheric layer during winter due to atmospheric stability. *None of the options* - Since **temperature inversion** accurately describes the mechanism responsible for trapping pollutants and water vapors in the lowermost atmospheric layer, this option is incorrect.

Q: Radiation exposure during infancy has been linked to which one of the following carcinoma?

Thyroid carcinoma. ***Thyroid carcinoma*** - The **thyroid gland** is particularly susceptible to radiation-induced damage, especially during childhood and infancy due to its rapid growth and high cellular turnover. - **Iodine-131 exposure**, often from nuclear accidents, is a well-established cause of thyroid cancer in children. *Breast carcinoma* - While radiation exposure is a known risk factor for **breast cancer**, the risk is generally higher with exposure during adolescence and early adulthood, coinciding with breast development, rather than infancy itself. - Cumulative radiation dose over a longer period, such as during multiple medical imaging procedures, contributes more significantly to this risk. *Melanoma* - **Melanoma** is primarily associated with **ultraviolet (UV) radiation exposure** from sunlight, particularly intense, intermittent exposure leading to sunburns. - Ionizing radiation, like that used in medical imaging, is not a primary risk factor for melanoma. *Lung carcinoma* - **Lung carcinoma** is strongly linked to **smoking** and exposure to environmental toxins such as radon, asbestos, and certain industrial chemicals. - While high-dose therapeutic radiation to the chest can increase the risk, routine diagnostic radiation in infancy is not a significant risk factor for lung cancer later in life.

Q: In which type of bag are biohazardous blood bags discarded?

***Red*** - **Blood bags (with or without blood)** are discarded in **red bags** according to **Biomedical Waste Management Rules, 2016** (India). - Red bags are designated for **contaminated waste recyclable** including IV sets, tubing, catheters, gloves, and blood bags. - This ensures proper segregation and recycling of plastic waste after appropriate treatment (autoclaving/microwaving). *Yellow* - **Yellow bags** are used for **infectious waste** requiring incineration or deep burial. - Includes anatomical waste, soiled waste (dressings, plaster casts), expired medicines, and chemical waste. - Blood bags do not fall under this category as they are recyclable plastic waste. *Black* - **Black bags** are for **general/domestic waste** that is non-hazardous and non-infectious. - Includes packaging materials, office waste, and non-contaminated items. - Biohazardous materials like blood bags must never be disposed in black bags. *White* - **White bags** or puncture-proof containers are for **sharps waste** including needles, syringes, scalpels, and broken glass. - This prevents needlestick injuries and ensures safe handling of sharp objects. - Blood bags are not sharp objects and belong in red bags.

Q: Which test is used to determine the effectiveness of pasteurization of milk?

Phosphatase test. ***Phosphatase test*** - The **phosphatase test** is used to determine if milk has been adequately pasteurized. The enzyme **alkaline phosphatase** is naturally present in raw milk and is destroyed at temperatures slightly higher than those used for pasteurization. - If **alkaline phosphatase** activity is detected, it indicates that the milk was either not heated sufficiently or was contaminated with raw milk after pasteurization. *Methylene blue reduction test* - The **methylene blue reduction test** measures the general microbial quality of milk and estimates the total bacterial count. - It does not specifically assess the effectiveness of pasteurization in destroying pathogens. *Turbidity test* - The **turbidity test** is primarily used to detect the presence of non-milk fats in milk or to assess protein stability. - It does not directly determine the effectiveness of **pasteurization** in eliminating microorganisms. *Resazurin test* - The **resazurin test** is another reductase test, similar to the methylene blue test, used to assess the hygienic quality of raw milk. - It measures the extent of microbial activity and does not specifically verify the adequacy of the **pasteurization process**.

Question 1

Which agency monitors air quality in India?

Accepted Answer

Central pollution control board

Answer

None of the above

Answer

Central air quality board

Answer

Central public works dept

Question 2

Which of the following is not a source of environmental radiation?

Accepted Answer

CO

Answer

Uranium

Answer

Radon

Answer

Radium

Question 3

In waste management, organic load is measured by which of the following?

Accepted Answer

Biological oxygen demand

Answer

Chemical oxygen demand

Answer

Suspended solid

Answer

Total dissolved solids

Question 4

What is the best type of incinerator for the disposal of infectious waste?

Accepted Answer

Double-chamber incinerator

Answer

Single-chamber incinerator

Answer

Triple-chamber incinerator

Answer

No incinerator

Question 5

What percentage of waste generated in hospitals is considered infectious?

Accepted Answer

15-20% of waste is infectious

Answer

80% of waste is infectious

Answer

100% of waste is infectious

Answer

65% of waste is infectious

Question 6

What is the primary objective of the Pradhan Mantri Ujjwala Yojana (PMUY)?

Accepted Answer

Providing clean cooking fuel to rural women

Answer

Promoting digital literacy among women

Answer

Providing employment opportunities

Answer

Reducing child trafficking

Question 7

In winter, water vapours and pollutants come to lie in the lowermost layer of atmosphere by -?

Accepted Answer

Temperature inversion

Answer

Acid rain

Answer

Greenhouse effect

Answer

None of the options

Question 8

Radiation exposure during infancy has been linked to which one of the following carcinoma?

Accepted Answer

Thyroid carcinoma

Answer

Breast carcinoma

Answer

Melanoma

Answer

Lung carcinoma

Question 9

In which type of bag are biohazardous blood bags discarded?

Answer

yellow

Answer

black

Answer

red

Answer

white

Question 10

Which test is used to determine the effectiveness of pasteurization of milk?

Accepted Answer

Phosphatase test

Answer

Methylene blue reduction test

Answer

Turbidity test

Answer

Resazurin test

Environmental Health — MCQs

Environmental Health — MCQs

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