Related Questions

Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
A 0.002
B 0.2
C 1.2
D 4.8
TLV of lead for public sewer/waste water is about __________ ppm.
A 1
B 25
C 150
D 650
Maximum permissible turbidity in potable water is __________ ppm.
A 1
B 10
C 250
D 1000
For classification of potable (drinking) water, we use a __________ filter.
A Gravity sand
B Plate and frame
C Vacuum leaf
D Rotary vacuum
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
A 5
B 100
C 1000
D 2000
Threshold limit value (TLV) of CO in air is __________ ppm.
A 5
B 50
C 2000
D 5000
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
A [

A.

B. 10-100

B 100-200
C 100-1000
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
A 1000 to 2000
B 3000 to 6000
C 6000 to 9000
D 10000 to 100000
Drinking (potable) water treatment does not involve
A Coagulation
B Sedimentation
C Softening
D Disinfection
Presence of bacteria in potable (drinking) water causes
A Turbidity
B Disease
C Bad odour
D Bad taste & colour

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