Environmental Health — Flashcards

Flashcard 91: Water should be boiled for _____ for household purification.

Answer: 5-10 minutes

Flashcard 92: _____ enzyme test results in  negative  after pasteurisation of milk

Answer: phosphatase

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Flashcard 93: _____ air changes/hour are recommended in high risk areas for a room of 24m3

Answer: 12

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Flashcard 94: _____ days is the optimum time for water storage

Answer: 10-14

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Flashcard 95: Identify the instrument: _____ Uses: Measurement of relative humidity and air temperature

Answer: Wet and Dry Bulb Thermometer

Flashcard 96: Airborne particle (droplet nuclei) size is _____

Answer: < 5 microns

Extra: Droplet nuclei (airborne transmission) are typically < 5 microns in size and can remain suspended in the air for long periods. Particles > 5 microns are considered droplets (droplet transmission). In environmental health, PM10 refers to particles < 10 microns which are inhalable.

Flashcard 97: SO2 is an indicator for _____

Answer: industrial air pollution

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Flashcard 98: AQI is _____ in severe air pollution

Answer: 401-500

Flashcard 99: horrocks apparatus contains _____ cups

Answer: 6

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Flashcard 100: Daylight factor (DF) formula is:

Answer: (Illuminance inside / Illuminance outside) × 100

Extra: The daylight factor is the ratio of the light level inside a structure to the light level outside the structure. It is expressed as a percentage.