80% less than 200 mesh size particles are called____________________?
80% less than 200 mesh size particles are called____________________?
A. Smoke
B. Powder
C. Grit
D. Aggregates
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Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?A. Acts as a green house gas thereby raising earth’s temperature
B. Causes asphyxia
C. Causes increase in sea level
D. Enhances the green house effectWhich of the following is the most lethal water pollutant ?
Which of the following is the most lethal water pollutant ?A. Phenol and cyanide
B. Chlorine
C. Alkalis
D. Suspended solidsSmog is ______________________?
Smog is ______________________?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-ashSulphur dioxide present in the industrial chimney exhaust gases causes____________________?
Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?A. Respiratory & lung disease
B. Reduction in plant’s productivity owing to acid rain
C. Corrosion of building materials
D. All A., B. and C.The upper layer of atmosphere is called the ____________________?
The upper layer of atmosphere is called the ____________________?A. Stratosphere
B. Troposphere
C. Ionosphere
D. None of theseNoise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?A. With greater number of blades
B. Of increased diameter
C. Both A. & B.
D. Neither A. nor B.