environment Flashcards
chloride available in bleaching powder
33 %
free residual chlorine in
- drinking water
- swiming pool water
- drinking water to kill cyclops
- > = 0.5 mg/l
- > = 1
- > =3
horrocks app used for?
chlorine demand estimation
chlorine demand estimation by horrocks app formula
n x 2 gm bleaching powder needed for 455 l
n is no of cups to show color change
chloroscope for ?
free chlorine level
water softening done if
hardness >150 mg/l or >3 meq/l
best indicator for water quality
e coli
fecal strep in water indicates
recent contaminatin
clostridum perfrengins in water indicates
remote cont
kata thermometer used for
low air velocity
sling psychrometer used for
air humidity levels`
air changes / hr in
- living room
- crowded room
2-3
4-6``
max ps4r(predictable 4 hr sweat rate)
<4.5l/ 4h
min illumination for satisfactory vision
15 - 20 ft candle
day light factor in living room and kitchen should be
> =8 %
>=10%
sound levell permissble in indian hosp wads
20-35 db
strong sewage when
BOD >= 300G/L
Sandfly vector for
kala azar, oriental sore, sandfly fever, oroya fever, carrion dis, vesicular stomatitis, summers meningitis
vesicular virus, naples, chandipura , changuinola, toscana, pandora, cyprus, sicilian, turkey
soft tick dis
q fever, relapsing fever
, kfd outside india
hard tick dis
babesiosis, indian tick typhus, tick hgic fever, tick enephalitis, kfd in india
louse borne
epidemic typhus, trench, pediculosis, relpasng fever
hole size of mosquito net
.0475 inch,
150 holes/ inch square