Free Practice Questions for UKOM DIV Sanitasi Lingkungan

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Key Facts: UKOM DIV Sanitasi Lingkungan Exam

CBT

Official exam delivery system

ukomnakes.kemdiktisaintek.go.id

Lifetime

STR validity under UU No. 17 Tahun 2023

UU No. 17 Tahun 2023 tentang Kesehatan

HAKLI

Indonesian Environmental Health Association

hakli.or.id

5 Pillars

Community-Led Total Sanitation (STBM) framework

Kementerian Kesehatan RI STBM program materials

UKOM DIV Sanitasi Lingkungan tests competency across water sanitation, food safety, healthcare waste management, indoor air quality, and vector surveillance. This is an independent 80-question English-language MCQ practice bank by OpenExamPrep.

Sample UKOM DIV Sanitasi Lingkungan Practice Questions

Try these sample questions to review concepts for the UKOM DIV Sanitasi Lingkungan exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 80+ question experience with AI tutoring.

1During a laboratory water treatment practical session, a Sanitarian performs a Jar Test on turbid river water. What is the primary operational objective of the initial rapid mixing stage (pengadukan cepat) at 100 to 120 rpm for 1 to 2 minutes?

A.To rapidly disperse the coagulant uniformly and destabilize colloidal electrical charges

B.To allow large visible floc particles to aggregate and settle to the bottom of the beaker

C.To strip volatile dissolved organic compounds and hydrogen sulfide through aeration

D.To measure the zeta potential directly using a conductivity probe

Explanation: The rapid mixing stage (pengadukan cepat) in water treatment serves to disperse the chemical coagulant (such as aluminum sulfate or PAC) instantaneously and uniformly throughout the water body. This allows multivalent metallic cations to compress the electrical double layer of negatively charged colloidal impurities, neutralizing their charges and initiating particle destabilization.

2A Sanitarian conducts a chemical examination of groundwater from a deep borehole in a karst limestone area. The water exhibits high total hardness (kesadahan total). Which pair of polyvalent cations is primarily responsible for water hardness?

A.Calcium (Ca²⁺) and Magnesium (Mg²⁺)

B.Sodium (Na⁺) and Potassium (K⁺)

C.Iron (Fe²⁺) and Manganese (Mn²⁺)

D.Zinc (Zn²⁺) and Copper (Cu²⁺)

Explanation: Total water hardness is predominantly caused by divalent alkaline earth metal cations, specifically Calcium (Ca²⁺) and Magnesium (Mg²⁺), which dissolve from limestone (CaCO3) and dolomite (CaMg(CO3)2) strata. While other divalent ions contribute minor hardness, Ca²⁺ and Mg²⁺ account for virtually all natural hardness in water supplies.

3In a laboratory Most Probable Number (MPN) coliform test using the multiple tube fermentation method (metode tabung ganda 5-5-5), what observation in the presumptive test (uji penduga) indicates a positive reaction after 24 to 48 hours at 35°C?

A.Turbidity accompanied by gas formation in the inverted Durham tube

B.Formation of a dark metallic red precipitate at the bottom of the tube

C.Complete clarification of the medium with a drop in temperature

D.Development of green fluorescence under 365 nm ultraviolet light

Explanation: In the presumptive test of the MPN coliform procedure using Lactose Broth or MacConkey Broth, coliform bacteria ferment lactose, producing acid and gas. A positive presumptive reaction is confirmed by visible turbidity (bacterial growth) and gas trapped inside the inverted Durham tube occupying at least 10% of the tube volume within 24 to 48 hours at 35-37°C.

4Following a positive presumptive MPN test, the Sanitarian proceeds with the confirmed test (uji penegas) to differentiate fecal (thermotolerant) coliforms from total coliforms. Which selective broth medium and incubation temperature are required?

A.Brilliant Green Lactose Bile Broth (BGLBB) or EC Medium incubated at 44.5°C ± 0.5°C

B.Nutrient Broth incubated at 20.0°C ± 0.5°C

C.Peptone Water incubated at 30.0°C ± 0.5°C

D.Selenite Cystine Broth incubated at 55.0°C ± 0.5°C

Explanation: To confirm the presence of fecal (thermotolerant) coliforms, an aliquot from the positive presumptive tube is inoculated into EC Medium or Brilliant Green Lactose Bile Broth (BGLBB) and incubated in a circulating water bath at 44.5°C ± 0.5°C for 24 hours. The elevated temperature inhibits non-fecal environmental coliforms while allowing fecal strains to produce gas.

5For the completed test (uji pelengkap) in water coliform analysis, colonies from a positive confirmed tube are streaked onto Eosin Methylene Blue (EMB) agar. Which colony appearance is characteristic and presumptively suggestive of Escherichia coli?

A.Nucleated dark colonies with a distinctive greenish-black metallic sheen

B.Mucoid pink colonies with colorless translucent margins

C.Colorless transparent colonies with smooth edges

D.Brilliant yellow colonies with extensive zone clearing

Explanation: On Eosin Methylene Blue (EMB) agar, rapid and vigorous lactose fermentation by E. coli precipitates the aniline dyes (eosin and methylene blue) under acidic conditions, forming dark, nucleated colonies with a characteristic greenish-black metallic sheen (kilap logam hijau).

6A Sanitarian evaluates the chlorination process of a rural communal water reservoir. To ensure microbial safety against recontamination while preventing unacceptable taste and odor, what is the recommended free residual chlorine (sisa klor bebas) concentration at distribution endpoints according to national guidelines?

A.0.2 to 0.5 mg/L

B.1.5 to 3.0 mg/L

C.5.0 to 10.0 mg/L

D.0.01 to 0.05 mg/L

Explanation: Standard water distribution health guidelines require a free residual chlorine (sisa klor bebas) concentration of 0.2 to 0.5 mg/L at the consumer tap or distribution endpoints after a minimum contact time of 30 minutes. This level guarantees persistent disinfection against post-treatment contamination while remaining palatable without excessive chlorinous odor.

7In a Rapid Sand Filter (Saringan Pasir Cepat / SPC) unit at a municipal water treatment plant, which operational parameter indicates that filter backwashing (pencucian balik) must immediately be initiated?

A.Head loss across the media exceeds the maximum limit or filtered water turbidity spikes

B.The filtered water pH increases above 8.5

C.Dissolved oxygen in the effluent drops to zero

D.The sand bed expands by more than 80% during normal gravity downward flow

Explanation: In rapid sand filtration, backwashing is initiated when the head loss (kehilangan tekanan) across the bed reaches the design terminal head loss (typically 2 to 2.5 meters) due to pore clogging, or when particulate breakthrough occurs, causing a sudden spike in effluent turbidity.

8What is the primary mechanism by which a Slow Sand Filter (Saringan Pasir Lambat / SPL) removes pathogens and fine organic matter from raw surface water?

A.Biological purification through an active biological layer called the Schmutzdecke

B.Rapid backwashing under high pressurized air injection

C.Chemical oxidation via continuous hypochlorite injection inside the sand pores

D.Thermal pasteurization generated by solar radiation on the sand bed

Explanation: Slow sand filtration relies fundamentally on biological filtration. An active biological layer known as the Schmutzdecke (or bio-layer) forms on the top few millimeters of the sand bed, composed of bacteria, algae, protozoa, and rotifers. These organisms actively trap, ingest, and break down pathogenic microorganisms and dissolved organic matter.

9During a sanitary survey (inspeksi sanitasi) of a residential dug well (sumur gali), a Sanitarian measures the horizontal distance between the well and a neighbor's septic tank soakaway pit (bidang resapan). What is the minimum recommended sanitary distance to prevent underground microbial contamination in ordinary sandy-clay soils?

A.At least 10 to 11 meters

B.At least 2 to 3 meters

C.At least 5 to 6 meters

D.At least 25 to 30 meters

Explanation: Indonesian environmental health guidelines and standard sanitary construction rules specify a minimum safe horizontal distance of 10 to 11 meters between a dug well (or shallow groundwater abstraction point) and a domestic wastewater source (septic tank absorption field/cubluk) in ordinary soils to allow adequate natural soil filtration and die-off of enteric pathogens.

10Groundwater extracted from a tube well is initially clear upon pumping but turns reddish-brown with an oily-looking sheen and stains plumbing fixtures after standing for several hours. What water treatment unit process should the Sanitarian recommend to treat this problem?

A.Aeration followed by filtration to oxidize soluble Fe²⁺ into insoluble Fe³⁺ precipitates

B.Direct ultraviolet (UV) radiation disinfection

C.Reverse osmosis with high-pressure brine recirculation

D.Activated carbon adsorption without prior aeration

Explanation: The symptoms indicate elevated dissolved ferrous iron (Fe²⁺), which is clear and soluble in anoxic underground aquifers. Upon contact with atmospheric oxygen, it oxidizes to ferric iron (Fe³⁺), precipitating as reddish-brown ferric hydroxide [Fe(OH)3]. Aeration introduces dissolved oxygen to accelerate oxidation, followed by sand filtration to trap the resulting precipitate.

About the UKOM DIV Sanitasi Lingkungan Exam

UKOM DIV Sanitasi Lingkungan is the mandatory national exit examination for environmental health and sanitation students in Indonesia, required for obtaining the STR Sanitarian.

Exam sponsor: Komite Nasional Uji Kompetensi Mahasiswa Bidang Kesehatan. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The test evaluates environmental sampling, laboratory analysis interpretation, risk assessment, intervention design, and community empowerment.

Time Limit

Not published in official sources reviewed.

Passing Score

Not published in official sources reviewed.

Exam / Certification Fees

Not published in official sources reviewed.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

22 of 80 practice questions

Penyehatan Air & Kualitas Air Minum (Water Sanitation)

Current water-quality sources, MPN coliform testing, jar testing, chlorination calculations, slow and rapid sand filtration, and well sanitary inspections.

16 of 80 practice questions

Penyehatan Makanan dan Minuman (Food & Beverage Hygiene)

Six principles of food hygiene, chemical adulterant testing (formalin, borax, rhodamine B), HACCP food hazard analysis, and restaurant sanitary inspections.

18 of 80 practice questions

Pengelolaan Limbah Padat, Cair & B3 Medis (Waste Management)

Healthcare infectious and sharps waste segregation, incinerator operations, IPAL wastewater treatment, BOD/COD testing, and domestic 3R recycling.

7 of 80 practice questions

Penyehatan Udara, Kebisingan & Radiasi Lingkungan (Air Quality & Physics)

Indoor air particulate matter (PM2.5, PM10), air microbial sampling, ventilation rates, sound level meter measurements, and workplace lighting lux standards.

10 of 80 practice questions

Pengendalian Vektor & Binatang Pembawa Penyakit (Vector & Pest Control)

Entomological surveillance for dengue vectors (House Index, Container Index, Breteau Index, ABJ), biological and chemical larviciding, and rodent control.

7 of 80 practice questions

Pemberdayaan Masyarakat, IKL & Regulasi (Community & Law)

STBM 5-pillar implementation, inspection of public places (TFU), Environmental Health Impact Assessment (AMDAL), and UU No. 17/2023 legal standards.

Preparing for the UKOM DIV Sanitasi Lingkungan Exam

What You Need to Know

Passing score: Not published in official sources reviewed.
Assessment: The test evaluates environmental sampling, laboratory analysis interpretation, risk assessment, intervention design, and community empowerment.
Time limit: Not published in official sources reviewed.
Exam / certification fees: Not published in official sources reviewed. Official sources

Using Our Practice Resources

Work through all 80 available questions
Review every answer and explanation
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UKOM DIV Sanitasi Lingkungan: Suggested Study Strategy

1Review the color-coding for healthcare waste containers in Indonesia: Yellow (infectious and pathological), Red (radioactive), Purple (cytotoxic), Brown (pharmaceutical and chemical), and Black (non-medical domestic).

2Understand the formula for Angka Bebas Jentik (ABJ = [Number of houses with no larvae / Total houses inspected] * 100%) and the national target (>= 95%).

3Use current official sources for water-quality interpretation; Permenkes No. 3 Tahun 2026 revoked most of Permenkes No. 2 Tahun 2023 while expressly preserving specified articles and its annex.

4Understand how to determine optimal coagulant dosage using the Jar Test procedure in water treatment.

Frequently Asked Questions

What is UKOM DIV Sanitasi Lingkungan?

UKOM DIV Sanitasi Lingkungan (Uji Kompetensi Program DIV Sanitasi Lingkungan) is Indonesia's national licensing exit examination for graduates of Diploma III and Diploma IV environmental health/sanitation programs, mandatory for earning the competency certificate and applying for the STR Sanitarian.

What are the 5 pillars of STBM in Indonesia?

Sanitasi Total Berbasis Masyarakat (STBM) comprises: 1) Stop Buang Air Besar Sembarangan (Stop Open Defecation), 2) Cuci Tangan Pakai Sabun (Handwashing with Soap), 3) Pengelolaan Air Minum dan Makanan Rumah Tangga (Household Drinking Water & Food Management), 4) Pengamanan Sampah Rumah Tangga (Household Solid Waste Management), and 5) Pengamanan Limbah Cair Rumah Tangga (Household Liquid Waste Management).

What is the STR validity period under UU No. 17 Tahun 2023?

Under UU No. 17 Tahun 2023 tentang Kesehatan, the Surat Tanda Registrasi (STR Sanitarian) issued by Konsil Kesehatan Indonesia (KKI) is valid for life. The practice license (SIPS) is issued by municipal health authorities and valid for 5 years.

Is this practice exam official?

No. This practice bank is an independent English-language educational question bank developed by OpenExamPrep for self-study and technical reasoning review. It is not affiliated with or endorsed by HAKLI, AIPKLI, or Kemdiktisaintek.