A. 10000
B. 5
C. 500
D. 1000
0
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?
0
Smog is ______________________?
A. < 1
B. 10-100
C. 100-200
D. 100-1000
0
Noise pollution level in a chemical plant is expressed in __________________?
A. Nothing but black smoke
B. A combination of smoke and fog
C. A liquid particle resulting from vapor condensation
D. A solid particle e.g. fly-ash
0
Which of the following is not a weightless pollutant ?
A. Roentgen
B. Decibel
C. Hertz
D. None of these
0
Noise level in a quiet private business office is about _____________ decibels?
A. SPM
B. Thermal pollution
C. Radioactive rays
D. Noise pollution
0
Which of the following fine dust removal equipments is the most efficient ?
A. 25
B. 50
C. 70
D. 85
0
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?
A. Bag filter
B. Scrubber
C. Electrostatic precipitator
D. Cyclone separator
0
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
A. 22
B. 42
C. 332
D. 1050
Download App