Environmental Health Practice Questions

Q: Methylene blue reduction test is done for estimating –

Bacterial activity in milk. ***Bacterial activity in milk*** - The **methylene blue reduction test (MBRT)** is a rapid and inexpensive method used to estimate the **bacterial load** in milk. - **Bacteria** in milk consume oxygen, creating a reducing environment that causes the blue methylene blue dye to decolorize. The faster the decolorization, the higher the bacterial count. *Fat content of milk* - The **fat content** of milk is typically determined using methods like the **Gerber test** or **Babcock method**, which involve acid digestion and centrifugation. - MBRT does not directly measure the amount of fat present in the milk sample. *Protein content of milk* - **Protein content** in milk is commonly measured using methods such as the **Kjeldahl method** or infrared analysis. - The MBRT is not designed to quantify the protein components of milk. *Sugar content of milk* - The **sugar content**, primarily **lactose**, in milk is measured using enzymatic assays or chromatographic methods. - MBRT does not provide information about the lactose concentration.

Q: Swajaldhara yojana is to provide -

Water. ***Water*** - The **Swajaldhara Yojana** is a **community-led initiative** launched by the Indian government to provide **safe drinking water** in rural areas. - It emphasizes **decentralized, demand-driven, and community-managed water supply systems**, promoting local ownership and sustainability. *Pension* - Schemes related to **pension** provision are generally managed under different government programs, such as the National Pension System or specific social security schemes for the elderly. - These programs focus on providing **financial security** during retirement, which is distinct from water supply. *Nutrition* - Government programs focused on **nutrition** often include initiatives like the Integrated Child Development Services (ICDS) or Mid-Day Meal Scheme. - These programs aim to address **malnutrition** and food security, which is not the primary objective of Swajaldhara Yojana. *Sickness Benefits* - **Sickness benefits** are typically provided through social security schemes or health insurance programs, such as the Employees' State Insurance Scheme (ESIS). - These benefits aim to provide **financial support** during periods of illness, which is unrelated to rural water supply.

Q: During water analysis in a hostel, amoebic cysts were seen. The best step to manage it is:

Boiling. **Boiling** - Boiling water at 100°C for at least one minute is highly effective in **killing amoebic cysts**, including *Entamoeba histolytica*, by denaturing their proteins and disrupting their structure. - This method ensures the **destruction of viable cysts**, preventing waterborne transmission of amoebiasis among hostel residents. *UV Rays* - While UV radiation can inactivate many microorganisms, its effectiveness against **amoebic cysts** can be inconsistent, as cysts are more resistant than bacteria or viruses. - The efficacy depends on the **dose and turbidity of the water**, which can shield cysts from UV light. *Chlorination* - **Amoebic cysts are highly resistant to standard chlorine levels** typically used in water disinfection. - Significantly higher doses and longer contact times of chlorine would be required to kill cysts, which may not be practical or safe for drinking water due to the formation of **disinfection byproducts**. *Iodine* - Iodine can kill some pathogens, but its efficacy against **amoebic cysts is variable and often insufficient** at concentrations safe for consumption. - It may not reliably kill all cysts, especially at **lower temperatures or shorter contact times**.

Q: Solid waste contaminated with blood and body fluids is classified under which category according to Bio-Medical Waste Management Rules?

6. ***Correct: Category 6*** - According to the **Bio-Medical Waste Management Rules, 2016**, solid waste contaminated with blood and body fluids is categorized under **Category 6**. - This includes items like **dressings, plaster casts, cotton swabs, and bags containing residual or discarded blood and blood components**. - These items require specific handling and disposal methods as they pose infection risk due to visible soiling or soaking with blood and bodily fluids. *Incorrect: Category 9* - Category 9 refers to **discarded linen, mattresses, and beddings contaminated with blood or body fluids**. - While also dealing with blood-contaminated materials, this category is specifically for textile/fabric items, not general solid waste like dressings and swabs. *Incorrect: Category 5* - Category 5 covers **discarded medicines and cytotoxic drugs**, including expired, discarded, or contaminated pharmaceutical products. - This category deals with pharmaceutical waste, not materials contaminated with blood and body fluids. *Incorrect: Category 3* - Category 3 is designated for **microbiology, biotechnology, and other clinical laboratory waste**, including laboratory cultures, stocks or specimens of microorganisms, live or attenuated vaccines, and human and animal cell cultures. - This category focuses on infectious biological agents and laboratory waste, not general solid waste contaminated with blood and body fluids.

Q: In which color bag should the plastic wrapper of a surgical syringe be discarded?

Yellow bag. ***Yellow bag*** - The plastic wrapper of a surgical syringe should be discarded in a **yellow bag** according to **Biomedical Waste Management Rules, 2016**. - Yellow bags are designated for **waste sharps including metals, plastics and glass** - specifically **non-chlorinated plastic waste** that has not been contaminated with blood or body fluids. - The wrapper is removed **before** the syringe is used, so it has **no patient contact** and is considered **non-infectious** plastic waste suitable for recycling or disposal. - As per **Category 7** of BMW Rules: Discarded and contaminated plastics are different from **unused wrappers** which are clean plastic waste. *Red bag* - **Red bags** are designated for **contaminated waste** (Category 3 & 6) including items soaked with blood, body fluids, or infectious materials like used gloves, blood-soaked cotton, tubing, catheters **after patient use**. - The plastic wrapper is discarded **immediately after opening** and has **no contact** with patient fluids, so it does not qualify as contaminated waste. - Only the **used syringe components** that contacted the patient would be infectious waste. *Yellow bag (Sharps)* - While yellow bags/containers are used for **sharps** (needles, scalpels, blades), the **yellow bag category** also includes non-sharp plastic waste. - The used needle itself goes into a **puncture-proof sharps container** (also marked yellow), but the wrapper goes in the yellow bag for plastics. *Blue bag* - **Blue/White translucent bags** are used for **glassware, metallic body implants** and other materials that can be autoclaved and recycled (Category 5). - Plastic wrappers do not fall into this category as they are not meant for autoclaving.

Q: Whispering produces a sound of:

20-30db. ***20-30db*** - Whispering is a very soft sound, falling within the lower range of human hearing and typically measuring **20-30 decibels (dB)**. - This low decibel level is why whispers are often used for private communication or when attempting to **avoid disturbing others**. *30-40db* - This range usually corresponds to sounds slightly louder than a whisper, such as a **quiet library**, **soft background music**, or the **rustling of leaves**. - While relatively low, it is still distinctively louder than the typical decibel level produced by whispering. *40-50db* - Sounds in this range are comparable to a **quiet office environment**, **moderate rainfall**, or **light traffic**. - These are clearly audible and significantly louder than a whispered voice. *50-60db* - This decibel level is associated with sounds like a **normal conversation at 3-5 feet**, a **dishwasher**, or **background restaurant noise**. - Such sounds are far too loud to be considered a whisper and would be easily heard by others.

Q: Recommended illumination range for regular work is _______ foot-candles.

25-50. ***25-50*** - For **regular work** or tasks requiring moderate visual effort, an illumination range of **25-50 foot-candles** (250-500 lux) is generally recommended to ensure adequate visibility and comfort. - This range balances sufficient light for tasks like **reading** or **writing** without causing glare or excessive energy consumption. *75-100* - An illumination range of **75-100 foot-candles** (750-1000 lux) is typically reserved for **tasks requiring precise visual acuity** or where fine details must be observed, such as intricate assembly work or detailed inspections. - Using such high illumination for regular work can lead to **eye strain** and excessive energy use. *10-25* - A range of **10-25 foot-candles** (100-250 lux) is suitable for **general lighting** in areas requiring minimal visual tasks, like hallways, lounges, or waiting areas where reading or close work is not primary. - This level is usually **insufficient for sustained regular work**, which often involves reading or writing. *50-75* - **50-75 foot-candles** (500-750 lux) is often recommended for **more demanding office work** or tasks involving prolonged reading of small print, which is a step above regular general work. - While it could be acceptable for some regular work, **25-50 foot-candles** is a more common and energy-efficient recommendation for general regular tasks.

Q: Which bag among the following shouldn't be incinerated as it contains cadmium?

Red. ***Correct Option: Red*** - **Red bags** are designated for **contaminated recyclable waste** including plastic items (IV sets, catheters, blood bags without blood). - Red bag waste should be **autoclaved/disinfected first, then recycled or shredded** - NOT incinerated. - Incineration of plastic waste releases **toxic compounds including dioxins, furans**, and potentially **cadmium** (from plastic additives) into the atmosphere. - The cadmium content in certain plastics makes incineration particularly hazardous, violating environmental safety protocols. *Incorrect Option: Yellow* - **Yellow bags** contain infectious and anatomical waste that is **specifically meant for incineration** or deep burial. - These are disposed through **incineration, plasma pyrolysis, or deep burial** as per BMW Rules. - Yellow bag incineration is the standard protocol for pathological and infectious waste. *Incorrect Option: Blue/White* - **Blue/White bags** are for **sharps waste** (needles, scalpels, broken glass). - Sharps are treated by **autoclaving, microwaving, or chemical disinfection**, then disposed in sanitary landfills. - Not typically incinerated due to glass and metal content. *Incorrect Option: Black* - **Black bags** contain **general non-hazardous waste** similar to municipal solid waste. - Disposed through **sanitary landfills**, not incineration. - Does not require specialized biomedical waste treatment.

Q: A good trap should have an effective seal of:

5 cm. ***5 cm*** - A good trap seal is designed to provide a sufficient **water barrier** to prevent the entry of **sewer gases** into a building. - A 5 cm seal is generally considered the **standard minimum depth** to effectively block these gases under normal operating conditions. *2.5 cm* - A 2.5 cm seal is generally considered **insufficient** as it may be susceptible to **siphonage** or rapid evaporation, leading to the loss of the water barrier. - This shallow depth increases the risk of **sewer gas entry**, posing a public health hazard. *10 cm* - While a 10 cm seal would provide an effective barrier, it is often **unnecessary** and can lead to **slower drainage** and inefficient fixture operation. - A deeper seal also requires more water to maintain, increasing potential for **clogging** and making it less practical for standard plumbing applications. *7.5 cm* - A 7.5 cm seal is generally **acceptable** and offers a good balance between effectiveness and practicality, but 5 cm is typically the minimum standard. - While robust, it is still considered **more than the common minimum requirement** without significant additional benefits over a 5 cm seal for most applications.

Q: Orthotolidine test is used to determine ?

Free and combined chlorine in water. ***Free and combined chlorine in water*** - The **orthotolidine test** is a **colorimetric method** used to measure the concentration of **residual chlorine** in water. - It reacts with both **free available chlorine** (hypochlorous acid and hypochlorite ions) and **combined available chlorine** (chloramines) to produce a **yellow color**. *Nitrates in water* - **Nitrates** are typically measured using methods like **cadmium reduction** or **UV spectrophotometry**, not the orthotolidine test. - High nitrate levels can indicate **agricultural runoff** or **sewage contamination**. *Nitrites in water* - **Nitrites** are commonly detected using the **Griess reagent method**, which produces a red-pink color. - The orthotolidine test is not designed to detect nitrites. *Ammonia content in water* - **Ammonia** is usually determined by methods such as the **Nessler method** or **ion-selective electrodes**. - These methods involve specific chemical reactions distinct from the orthotolidine reaction.

Question 1

Methylene blue reduction test is done for estimating –

Accepted Answer

Bacterial activity in milk

Answer

Fat content of milk

Answer

Protein content of milk

Answer

Sugar content of milk

Question 2

Swajaldhara yojana is to provide -

Accepted Answer

Water

Answer

Pension

Answer

Nutrition

Answer

Sickness Benefits

Question 3

During water analysis in a hostel, amoebic cysts were seen. The best step to manage it is:

Accepted Answer

Boiling

Answer

UV Rays

Answer

Chlorination

Answer

Iodine

Question 4

Solid waste contaminated with blood and body fluids is classified under which category according to Bio-Medical Waste Management Rules?

Accepted Answer

6

Answer

9

Answer

5

Answer

3

Question 5

In which color bag should the plastic wrapper of a surgical syringe be discarded?

Accepted Answer

Yellow bag

Answer

Black bag

Answer

Red bag

Answer

Blue bag

Question 6

Whispering produces a sound of:

Accepted Answer

20-30db

Answer

30-40db

Answer

40-50db

Answer

50-60db

Question 7

Recommended illumination range for regular work is _______ foot-candles.

Accepted Answer

25-50

Answer

75-100

Answer

10-25

Answer

50-75

Question 8

Which bag among the following shouldn't be incinerated as it contains cadmium?

Accepted Answer

Red

Answer

Black

Answer

Yellow

Answer

Blue

Question 9

A good trap should have an effective seal of:

Accepted Answer

5 cm

Answer

2.5 cm

Answer

10 cm

Answer

7.5 cm

Question 10

Orthotolidine test is used to determine ?

Accepted Answer

Free and combined chlorine in water

Answer

Nitrates in water

Answer

Nitrites in water

Answer

Ammonia content in water

Environmental Health — MCQs

Environmental Health — MCQs

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