Environmental Health — Flashcards

Flashcard 231: First cup which develops blue color in Horrock's apparatus gives an estimate of the amount of bleaching powder needed to disinfect _____ L of the sample water.

Answer: 455

Flashcard 232: Epidemic dropsy occurs due to _____ poisoning

Answer: Argemone mexicana

Flashcard 233: _____ is a waste disposal method that packs hazardous materials in containers made of impervious and non-reactive material

Answer: Encapsulation

Flashcard 234: The borehole latrine was introduced in 1930s to combat _____ infections

Answer: hookworm

Flashcard 235: _____ is a form of mycotic poisoning when the fungal toxins contaminate food and cause toxic effects

Answer: Mycotoxicosis

Flashcard 236: Sling psychrometer (also called whirling psychrometer) is used to measure the _____.

Answer: relative humidity

Flashcard 237: Distant (remote) fecal contamination of water is suggested by the presence of ________

Answer: Clostridium perfringens

Flashcard 238: Which mosquito(s) breed in artificial collections of water?_____

Answer: Aedes

Flashcard 239: Chlorine demand or dose of bleaching powder required is given by _____ g for 455 liters of water; where 'n' is the position of cup which developed blue colour in Horrock's apparatus

Answer: n

Extra: <b>Horrock's Apparatus:</b> - Used to estimate the dose of bleaching powder required to disinfect water. - <b>n</b> = number of the cup (1–6) that first develops a blue color. - Amount of bleaching powder required for <b>455 liters</b> (100 gallons) = <b>n</b> grams. - Amount of bleaching powder required for <b>1000 liters</b> = <b>2n</b> grams (approximate; 2.2n is more exact). Note: Some older texts refer to 'n' being the number of level spatulas (2g each), but the standard exam answer for grams required for 455L is <b>n</b>.

Flashcard 240: The number of mosquitoes collected per man-hour is known as _____

Answer: Man-hour catch (Mosquito density)