Environmental Health Practice Questions

Q: The image given below is symbolic of:

Pesticide toxicity labels. ***Pesticide toxicity labels*** - The image displays the **hazard symbols** and **labels**, particularly the **skull and crossbones** and the words "POISON," "DANGER," and "CAUTION" on color-coded diamonds. - These are internationally recognized symbols used to indicate different levels of **toxicity** and **hazard** associated with chemical substances, most notably in **pesticides**. *Biomedical waste* - Biomedical waste symbols typically involve a **biohazard symbol**, which is a **three-crescent circle** in a black or red color, without other text or skull imagery. - While it indicates hazard, it specifies biological risks, not chemical toxicity as depicted. *Contraceptive efficacy labels* - Contraceptive efficacy is usually indicated by **numerical percentages** or **descriptive terms** (e.g., "highly effective," "moderately effective"), not hazard symbols. - These labels are found on product packaging or informational materials to inform users about the effectiveness of a contraceptive method. *Nuclear toxicity labels* - Nuclear toxicity or **radioactivity labels** feature a **trefoil symbol** (a three-bladed propeller shape) in black on a yellow background. - This symbol is distinct from the skull and crossbones or the "POISON" warnings for chemical toxicity shown in the image.

Q: The symbols shown in the image represent which types of biomedical waste?

Biohazard and cytotoxic waste. ***Biohazard and cytotoxic waste*** - The left symbol shows the **biohazard trefoil** with three interlocking arcs and a central ring, universally recognized for **infectious waste** and biological hazards. - The right symbol displays a **black triangle with letter 'C'**, specifically indicating **cytotoxic waste** used for chemotherapy drugs and cell-toxic materials. *Nuclear waste and cytotoxic waste* - The left symbol is the **biohazard trefoil**, not the **radiation hazard symbol** which has three blades radiating from a central point. - While cytotoxic identification is correct for the right symbol, the left represents biological hazards, not nuclear materials. *Nuclear waste and cryogenic waste* - The left symbol represents **biohazard/infectious waste**, not **nuclear or radioactive materials**. - **Cryogenic waste** involves extremely cold substances and uses different hazard symbols, not the triangle with 'C' shown. *Biohazard and radioactive waste* - While the left symbol correctly identifies **biohazard**, the right symbol represents **cytotoxic waste**, not radioactive materials. - **Radioactive waste** symbols typically feature the classic three-blade propeller design, different from the cytotoxic triangle.

Q: The medical officer at a PHC has seen a large number of cases with the following presentation in the last 6 months. Which illness should he be concerned about? (Recent NEET Pattern 2016-17)

Skeletal fluorosis. ***Skeletal fluorosis*** - The image shows **bowed legs**, indicating bone deformity. The arrows point to thickened periosteum or bony outgrowths, characteristic of chronic skeletal involvement. - **Skeletal fluorosis** results from excessive fluoride intake, leading to **bone deformities, sclerosis, and periosteal thickening**, consistent with the visible signs. *Viral myocarditis* - This condition primarily affects the **heart muscle**, causing symptoms like shortness of breath, chest pain, and fatigue. - It does not typically manifest with visible **bowed legs** or **bony deformities** as seen in the image. *Filariasis* - **Filariasis** (elephantiasis) is characterized by severe **lymphedema**, leading to massive swelling and thickening of the skin and subcutaneous tissue, typically in the limbs. - While it causes limb enlargement, the image shows distinct **bone deformities** rather than typical diffuse soft tissue swelling associated with filariasis. *Epidemic dropsy* - **Epidemic dropsy** results from contamination of edible oils with **sanguinarine**, causing generalized edema, skin lesions, and cardiac issues. - Although it causes edema, it doesn't primarily present with **bowed legs** or **skeletal deformities** as the prominent feature.

Q: The biomedical waste category for the item shown in the image is:

Cytotoxic waste. ***Cytotoxic waste*** - The image displays a **bone marrow needle**, a device used to obtain bone marrow samples, often in the diagnosis and monitoring of cancers. - Materials contaminated with **chemotherapeutic agents** or originating from patients undergoing such treatments are classified as cytotoxic waste due to their genotoxic, carcinogenic, or teratogenic properties. *Biomedical waste* - **Biomedical waste** is a broader category that includes general healthcare waste, but cytotoxic waste requires specific handling due to its hazardous nature. - While a bone marrow needle is a medical device, its association with cancer treatment and potentially cytotoxic substances elevates its classification beyond regular biomedical waste. *Radiation hazard* - **Radiation hazard** waste typically involves materials contaminated with radioactive isotopes, indicated by a trefoil symbol. - The instrument shown is not associated with radioactive materials or procedures involving ionizing radiation. *Bioterrorism* - **Bioterrorism** refers to the intentional release of biological agents to cause illness or death in humans, animals, or plants. - The item pictured is a medical instrument for diagnostic purposes, unrelated to the deliberate use of biological agents for harm.

Q: What are the reasons for choosing coliform organisms as indicators of faecal pollution of water rather than the waterborne pathogens directly? I. They are present in great abundance in the human intestine and excreted in great numbers in faeces. II. They have lower resistance to forces of natural purification. III. They survive lesser than the pathogens. IV. They are easily detected by culture methods. Select the correct answer using the code given below :

I and IV. ***I and IV*** - **Coliforms** are found in abundance in the human intestine and are excreted in large numbers, making their presence a reliable indicator of potential fecal contamination. - They are also relatively **easy to detect** using standard culture methods, which allows for rapid and cost-effective testing of water quality. *II and III* - This statement is incorrect because coliforms generally have **higher resistance** to environmental stresses and **survive longer** in water than many fastidious waterborne pathogens. - If coliforms survived less than pathogens, their absence would not guarantee the absence of more resilient harmful organisms. *I only* - While statement I is correct, it does not fully encompass all the critical reasons for using coliforms as indicators. The **ease of detection** (statement IV) is equally crucial for their practical application. - Relying solely on abundance would make monitoring less efficient without practical and rapid detection methods. *IV only* - While statement IV is correct, it fails to mention the critical aspect of **coliform abundance** in feces, which makes them a meaningful indicator. - The ease of detection alone wouldn't make them suitable if they weren't consistently present in fecal matter.

Q: Under the Biomedical Waste Management Rules 2016, human anatomical waste is to be carried in which colour plastic bags?

Yellow. ***Yellow*** - **Human anatomical waste** (e.g., organs, tissues, body parts) is designated to be collected in **yellow** plastic bags according to the Biomedical Waste Management Rules 2016. - This category also includes soiled waste (items contaminated with blood/body fluids), expired medicines, and chemical waste. - This waste is typically **incinerated or deeply buried** to ensure proper disposal and prevent the spread of infection. *Red* - **Red** plastic bags are used for **contaminated waste (recyclable)**, such as tubing, catheters, intravenous sets, soiled gloves, and other contaminated plastic items. - This waste is **sterilized by autoclaving/microwaving** before being shredded and sent for recycling. *White* - **White (translucent)** bags are used for **sharp waste** including needles, syringes with needles, scalpel blades, and broken glass. - Also used for waste sharps including metals. - This waste is **disinfected by autoclaving/microwaving** and then subjected to shredding or mutilation. *Blue* - **Blue** bags are used for **glassware and metallic body implants** (e.g., broken or discarded glass vials, ampoules). - This waste is **disinfected/autoclaved** and then sent for recycling or appropriate disposal.

Q: How much illumination is recommended by the Illuminating Engineering Society for general office work?

400 lux. ***400 lux*** - The **Illuminating Engineering Society (IES)** recommends 400 lux for general office work, which includes tasks requiring moderate visual precision. - This level of illumination ensures **adequate visibility** and **reduces eye strain** for typical office activities. *200 lux* - This level is generally considered **too low** for detailed office work and would likely lead to eye fatigue and reduced productivity. - 200 lux might be suitable for casual areas like **corridors** or **waiting rooms**, but not for active work environments. *100 lux* - **100 lux** is an extremely low level of illumination, typically suitable for areas with very minimal visual requirements, such as **storage rooms or archives**. - It is **insufficient** for any form of general office work, making tasks difficult and uncomfortable. *900 lux* - While providing high illumination, **900 lux** is usually considered **excessive** for general office work and can lead to glare and discomfort. - Such high levels are typically reserved for **precision tasks** like drafting or detailed examination, where very fine visual discrimination is needed.

Q: As an index of thermal comfort, the 'Corrected Effective Temperature' is considered to be an improvement over 'Effective Temperature'. It deals with which of the following factors? I. Air velocity II. Humidity III. Mean radiant heat IV. Sweat rate Select the correct answer using the code given below :

I, II and III. ***I, II and III*** - The **"Corrected Effective Temperature"** (CET) improves upon the standard Effective Temperature (ET) by incorporating the **mean radiant heat (radiant temperature)**, along with **air temperature**, **humidity**, and **air velocity**. - Unlike **Effective Temperature** which considered air temperature, humidity, and air velocity, CET acknowledges the significant impact of **radiant heat** from surrounding surfaces on human thermal comfort, making it a more comprehensive index. - The key improvement: CET = ET + Mean Radiant Heat consideration. *I, III and IV* - While **air velocity** and **mean radiant heat** are indeed considered in CET, **sweat rate** is not a direct input parameter for calculating CET. - **Sweat rate** is a physiological response to thermal stress, not an environmental factor measured by thermal comfort indices. - CET aims to provide an objective index of thermal sensation based on environmental parameters, rather than individual physiological responses. *II, III and IV* - This option correctly identifies **humidity** and **mean radiant heat** as factors, but incorrectly includes **sweat rate** as a direct component of CET calculation. - **Air velocity** (I) is a crucial factor in both ET and CET, and its exclusion makes this option incomplete and incorrect. *I and II only* - This option is incomplete as it omits **mean radiant heat (III)**, which is the defining improvement that distinguishes CET from ET. - While **air velocity (I)** and **humidity (II)** are indeed part of CET, without including the radiant heat component, this would essentially describe only part of the Effective Temperature index, not the Corrected version.

Q: Water contamination with which chemical can lead to methaemoglobinaemia?

Nitrate. ***Nitrate*** - **Nitrate** compounds in contaminated water can be reduced to **nitrites** in the gastrointestinal tract, especially in infants. - **Nitrites** oxidize the iron in **hemoglobin** from the ferrous (Fe2+) to the ferric (Fe3+) state, forming **methaemoglobin**, which cannot bind oxygen. *Sulphide* - **Sulphide** (e.g., hydrogen sulfide) poisoning primarily affects the **respiratory and nervous systems** by inhibiting cytochrome c oxidase. - It does not directly cause the formation of **methaemoglobin** as its primary mechanism of toxicity. *Fluoride* - **Fluoride** contamination is primarily associated with **dental fluorosis** (mottling of teeth) and **skeletal fluorosis** (bone and joint pain, brittle bones). - It does not directly induce **methaemoglobinaemia** as its main toxicological effect. *Cyanide* - **Cyanide** poisoning acts by inhibiting **cytochrome c oxidase** in the mitochondrial electron transport chain, leading to cellular hypoxia. - While it can impair oxygen utilization, it does not primarily cause **methaemoglobinaemia** by oxidizing hemoglobin.

Q: The 'Nalgonda Technique' developed by the National Environmental Engineering Research Institute (NEERI) was developed primarily for the removal of which one of the following from water ?

Fluoride. ***Fluoride*** - The **Nalgonda Technique** is a defluoridation method primarily used to remove excess **fluoride** from drinking water. - This technique utilizes the principles of chemical precipitation, adsorption, and ion exchange, using **alum** (aluminum sulfate), **lime**, and **bleaching powder** as coagulants. - Developed by NEERI to address endemic **fluorosis** in areas with high fluoride content in groundwater, particularly in regions like Nalgonda district in Telangana. *Chlorine* - Chlorine is commonly used as a **disinfectant** in water treatment to kill bacteria and viruses, not as a target for removal by the Nalgonda Technique. - Excess chlorine can be removed via activated carbon filtration or aeration, methods distinct from the Nalgonda process. *Iron* - Iron removal from water typically involves **aeration**, oxidation (e.g., with chlorine or potassium permanganate), followed by filtration. - While alum (a component of the Nalgonda Technique) can aid in iron precipitation, the Nalgonda Technique's primary design is not for iron removal. *Asbestos* - Asbestos fibers are typically removed from water using **filtration methods** like membrane filtration or granular media filtration. - The Nalgonda Technique is a chemical precipitation process not specifically designed or effective for the removal of fibrous materials like asbestos.

Question 1

The image given below is symbolic of:

Accepted Answer

Pesticide toxicity labels

Answer

Biomedical waste

Answer

Contraceptive efficacy labels

Answer

Nuclear toxicity labels

Question 2

The symbols shown in the image represent which types of biomedical waste?

Accepted Answer

Biohazard and cytotoxic waste

Answer

Nuclear waste and cytotoxic waste

Answer

Nuclear waste and cryogenic waste

Answer

Biohazard and radioactive waste

Question 3

The medical officer at a PHC has seen a large number of cases with the following presentation in the last 6 months. Which illness should he be concerned about? (Recent NEET Pattern 2016-17)

Accepted Answer

Skeletal fluorosis

Answer

Viral myocarditis

Answer

Filariasis

Answer

Epidemic dropsy

Question 4

The biomedical waste category for the item shown in the image is:

Accepted Answer

Cytotoxic waste

Answer

Biomedical waste

Answer

Radiation hazard

Answer

Chemical waste

Question 5

What are the reasons for choosing coliform organisms as indicators of faecal pollution of water rather than the waterborne pathogens directly?
I. They are present in great abundance in the human intestine and excreted in great numbers in faeces.
II. They have lower resistance to forces of natural purification.
III. They survive lesser than the pathogens.
IV. They are easily detected by culture methods.
Select the correct answer using the code given below :

Accepted Answer

I and IV

Answer

II and III

Answer

I only

Answer

IV only

Question 6

Under the Biomedical Waste Management Rules 2016, human anatomical waste is to be carried in which colour plastic bags?

Accepted Answer

Yellow

Answer

Red

Answer

White

Answer

Blue

Question 7

How much illumination is recommended by the Illuminating Engineering Society for general office work?

Accepted Answer

400 lux

Answer

200 lux

Answer

100 lux

Answer

900 lux

Question 8

As an index of thermal comfort, the 'Corrected Effective Temperature' is considered to be an improvement over 'Effective Temperature'. It deals with which of the following factors?
I. Air velocity
II. Humidity
III. Mean radiant heat
IV. Sweat rate

Select the correct answer using the code given below :

Accepted Answer

I, II and III

Answer

I, III and IV

Answer

II, III and IV

Answer

I and II only

Question 9

Water contamination with which chemical can lead to methaemoglobinaemia?

Accepted Answer

Nitrate

Answer

Sulphide

Answer

Fluoride

Answer

Cyanide

Question 10

The 'Nalgonda Technique' developed by the National Environmental Engineering Research Institute (NEERI) was developed primarily for the removal of which one of the following from water ?

Accepted Answer

Fluoride

Answer

Chlorine

Answer

Iron

Answer

Asbestos

Environmental Health — MCQs

Environmental Health — MCQs

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