NEET-PG 2013

1544 Questions — Page 59 of 155

Community Medicine

9 questions

Q581

At what stage does the contraction of a family typically begin?

Q582

Which of the following gases is a significant contributor to the greenhouse effect?

Q583

According to WHO guidelines, what is the recommended minimum air change rate per hour in isolation rooms for airborne infection control?

Q584

Which of the following insects has shown the least widespread development of resistance to DDT?

Q585

What is the minimum contact period required for effective chlorination of drinking water?

Q586

Which of the following statements about slow sand filters is true?

Q587

What is a psychrometer used to measure?

Q588

What is a standard requirement for the design of a slaughterhouse?

Q589

In rural areas, what is the recommended distance for cattle sheds to be placed away from houses?

NEET-PG 2013 - Community Medicine NEET-PG Practice Questions and MCQs

Question 581: At what stage does the contraction of a family typically begin?

A. Marriage
B. Birth of the first child
C. Birth of the last child
D. Leaving home of the first child (Correct Answer)

Explanation: ***Leaving home of the first child*** - The **departure of the first child** from the home marks the beginning of the **contraction phase** of the family life cycle. - This stage signifies a decrease in the number of active family members residing in the home, initiating the process of family shrinkage. *Marriage* - Marriage is the **initial stage** of the family life cycle, where a new family unit is formed, typically referred to as the **establishment phase**. - This phase focuses on **role adjustment** and bonding, not the contraction of the family size. *Birth of the first child* - The birth of the first child marks the beginning of the **expansion stage** of the family life cycle. - This stage is characterized by an **increase in family size** and the establishment of parental roles. *Birth of the last child* - The birth of the last child typically represents the **end of the expansion phase** and the beginning of the **stable or child-rearing phase**. - While it caps the increase in family size, it doesn't initiate the contraction, as all children are still living at home.

Question 582: Which of the following gases is a significant contributor to the greenhouse effect?

A. CO2
B. Methane
C. Sulfur hexafluoride
D. All of the options (Correct Answer)

Explanation: ***All of the options*** - All listed gases (CO2, Methane, and Sulfur hexafluoride) are recognized as significant **greenhouse gases**, contributing to the **greenhouse effect** and **climate change**. - While they differ in their **global warming potential** and atmospheric lifetimes, each plays a role in trapping heat in the Earth's atmosphere. *CO2* - **Carbon dioxide** is a major greenhouse gas, primarily from the burning of **fossil fuels** and deforestation. - It is often considered the most significant contributor due to its high atmospheric concentration and long-term effects. *Methane* - **Methane** is a potent greenhouse gas, with a much higher **global warming potential** per molecule than CO2 over a shorter timescale. - Its sources include agricultural activities (livestock, rice cultivation), natural gas leaks, and landfills. *Sulfur hexafluoride* - **Sulfur hexafluoride** is a synthetic greenhouse gas with an extremely high **global warming potential** and a very long atmospheric lifetime. - Although its atmospheric concentration is lower than CO2 or methane, its potency makes it a significant contributor in specialized industrial applications.

Question 583: According to WHO guidelines, what is the recommended minimum air change rate per hour in isolation rooms for airborne infection control?

A. 2-3 air changes per hour
B. 4 air changes per hour
C. 1 air change per hour
D. More than 6 air changes per hour (Correct Answer)

Explanation: ***More than 6 air changes per hour*** - The World Health Organization (WHO) recommends a **minimum of 6 air changes per hour (ACH)** for airborne precaution rooms, particularly for naturally ventilated settings. - For mechanical ventilation systems, **WHO recommends 12 ACH** for airborne infection isolation rooms to effectively dilute and remove airborne infectious particles. - This higher rate ensures adequate ventilation to reduce the concentration of airborne pathogens like tuberculosis, measles, and varicella. - The WHO guidelines on Natural Ventilation for Infection Control in Health-Care Settings (2009) specify these minimum rates for effective airborne infection control. *2-3 air changes per hour* - An air change rate of **2-3 ACH** may be acceptable for general patient rooms or outpatient areas with natural ventilation in resource-limited settings. - However, this rate is **insufficient for airborne infection isolation rooms** where higher-risk procedures are performed or patients with confirmed airborne infections are housed. - This low rate does not provide adequate dilution of infectious aerosols for airborne precautions. *4 air changes per hour* - While **4 air changes per hour** provides better ventilation than 2-3 ACH, it still falls **below the WHO minimum recommendation of 6 ACH** for airborne infection isolation. - This rate might be acceptable for general wards but is inadequate for dedicated isolation rooms requiring airborne precautions. *1 air change per hour* - An **air change rate of 1 per hour** is completely insufficient for any healthcare infection control measures. - This extremely low rate would lead to dangerous accumulation of infectious particles, significantly increasing transmission risk. - Such minimal ventilation is unacceptable even for general patient care areas.

Question 584: Which of the following insects has shown the least widespread development of resistance to DDT?

A. Mosquitoes
B. Fleas
C. Tsetse flies (Correct Answer)
D. Ticks

Explanation: ***Tsetse flies*** - **Tsetse flies** have shown the least widespread development of **resistance to DDT**, likely due to their specific life cycles and limited exposure in widespread application campaigns. - This has made DDT, or its successor compounds, remain effective in certain tsetse control programs where other insects have developed high resistance. *Mosquitoes* - **Mosquitoes** have developed **widespread resistance to DDT** globally, significantly impacting malaria control efforts. - Their rapid breeding cycles and extensive exposure to DDT over decades led to the selection and proliferation of resistant strains. *Fleas* - **Fleas** have also developed **significant resistance to DDT**, especially in regions where it was heavily used for pest control in homes and livestock. - This resistance is a major factor in the continued prevalence of flea-borne diseases in certain areas. *Ticks* - **Ticks** have shown considerable development of **resistance to DDT** and other acaricides due to widespread use in livestock and agricultural settings. - Their resistance has complicated efforts to control tick-borne diseases and protect animal health.

Question 585: What is the minimum contact period required for effective chlorination of drinking water?

A. 2 hrs
B. 4 hrs
C. 1 hour
D. 30 minutes (Correct Answer)

Explanation: ***30 minutes*** - A minimum **contact period of 30 minutes** is generally recommended for effective chlorination to sufficiently inactivate most pathogenic microorganisms in drinking water. - This duration allows for adequate time for the **chlorine residual** to penetrate and destroy bacterial and viral structures. *1 hour* - While a longer contact time like 1 hour would be effective, it is not the **minimum required** for practical purposes and might lead to increased operational costs or complexity without significant additional benefit in typical scenarios. - Exceeding the minimum contact time can sometimes lead to the formation of **disinfection byproducts**, although this is more dependent on chlorine concentration and water composition. *2 hrs* - A contact time of 2 hours significantly exceeds the **minimum effective period** for most disinfection needs. - Such extended contact times are usually only considered in specific situations with highly resistant pathogens or particular water quality challenges, or when using **lower chlorine doses**. *4 hrs* - A 4-hour contact period is far beyond the **standard minimum** for effective chlorination of drinking water. - Such long contact times are typically impractical for municipal water treatment and could potentially increase the risk of forming **undesirable disinfection byproducts** if not carefully managed.

Question 586: Which of the following statements about slow sand filters is true?

A. Is more expensive than other filters
B. Requires a longer duration for filtration (Correct Answer)
C. Uses sand size of 0.4 - 0.7 mm
D. Occupies less space than other filters

Explanation: ***Requires a longer duration for filtration*** - **Slow sand filters** operate at a much lower filtration rate (0.1–0.4 m/h) compared to rapid sand filters, thus requiring a **longer duration** to process the same volume of water. - This low filtration rate allows for the formation of a biological layer, the **schmutzdecke**, which is responsible for much of the purification. *Is more expensive than other filters* - **Slow sand filters** are generally **less expensive to construct and operate** than rapid sand filters because they do not require extensive chemical coagulation, flocculation, or backwashing equipment. - Their primary cost is often land acquisition due to the **larger footprint** required. *Uses sand size of 0.4 - 0.7 mm* - **Slow sand filters** use **finer (smaller) sand**, typically with an **effective size of 0.15-0.30 mm**, which is smaller than the sand used in rapid sand filters (0.4-0.7 mm). - The smaller sand particle size contributes to the slower filtration rate and enhanced biological treatment. *Occupies less space than other filters* - **Slow sand filters** require **significantly more land area** than rapid sand filters for a given output because of their low filtration rate and large basin size. - This larger footprint can be a limiting factor in areas with high land costs.

Question 587: What is a psychrometer used to measure?

A. Humidity level (Correct Answer)
B. Airflow rate
C. Ambient temperature
D. Surface temperature

Explanation: ***Humidity level*** - A **psychrometer** measures **humidity**, specifically **relative humidity** and dew point. - It consists of two thermometers: a **dry-bulb** and a **wet-bulb** thermometer, which measure the cooling effect of evaporation. *Airflow rate* - **Airflow rate** is typically measured by devices such as **anemometers** or **flow meters**. - These instruments quantify the velocity or volume of air moving through a system. *Ambient temperature* - While a psychrometer includes dry-bulb thermometers that measure **ambient temperature**, its primary purpose is not just this, but rather to calculate **humidity** using the difference between wet and dry bulb readings. - A standard **thermometer** is a simpler and more direct tool for measuring only ambient temperature. *Surface temperature* - **Surface temperature** is usually measured using **infrared thermometers** or **thermocouples** placed in direct contact with a surface. - A psychrometer is designed to measure atmospheric conditions, not the temperature of a solid surface.

Question 588: What is a standard requirement for the design of a slaughterhouse?

A. Adequate ventilation systems must be installed.
B. Floors and walls must be made of washable, non-absorbent materials.
C. Separate areas for clean and dirty operations must be maintained.
D. All of the above are standard requirements. (Correct Answer)

Explanation: ***All of the above are standard requirements.*** - Proper design and construction of a slaughterhouse are crucial for maintaining **hygiene**, preventing **contamination**, and ensuring **food safety**. - All three requirements work together to create a safe environment for meat processing and prevent the spread of pathogens. - These standards are mandated by public health regulations and food safety guidelines. **Why each requirement is essential:** **Adequate ventilation systems must be installed:** - Controls **temperature and humidity** in processing areas - Removes airborne contaminants and prevents condensation - Ensures worker comfort and reduces microbial growth - Helps in odor control and maintaining air quality **Floors and walls must be made of washable, non-absorbent materials:** - Enables **easy cleaning and sanitation** to prevent microbial growth - Non-absorbent surfaces (like tiles, stainless steel) prevent **contamination absorption** - Facilitates effective disinfection procedures - Prevents harboring of pathogens in porous materials **Separate areas for clean and dirty operations must be maintained:** - Prevents **cross-contamination** between raw and processed products - Clean areas include deboning, cutting, packaging - Dirty areas include stunning, bleeding, evisceration, hide removal - Physical separation is a fundamental principle of **HACCP** (Hazard Analysis Critical Control Point) systems

Question 589: In rural areas, what is the recommended distance for cattle sheds to be placed away from houses?

A. 5 feet
B. 10 feet
C. 20 feet
D. 25 feet (Correct Answer)

Explanation: ***25 feet*** - A minimum distance of **25 feet (approximately 7.6 meters)** is recommended between cattle sheds and houses in rural areas. - This distance helps to mitigate **odors, flies, dust, and noise**, contributing to better hygiene and living conditions. *5 feet* - A distance of **5 feet** is generally considered too close and would not effectively prevent the transmission of **odors, pests, and potential pathogens** from cattle sheds to houses. - This proximity increases the risk of **nuisance and health hazards** to residents. *10 feet* - While better than 5 feet, a distance of **10 feet** may still be insufficient to adequately separate cattle sheds from houses to prevent issues like **strong odors and fly infestations**. - This proximity could still lead to **sanitation and comfort concerns** for residents. *20 feet* - A distance of **20 feet** offers a reasonable buffer; however, **25 feet** is the more commonly recommended minimum to ensure a greater margin of safety and comfort. - While 20 feet is better for ventilation and pest control than smaller distances, it might still allow some impact on **residential air quality**.

Forensic Medicine

1 questions

Q581

Which of the following is a stomach poison?