Dissolved oxygen content in river water is around _____________ ppm?
Dissolved oxygen content in river water is around _____________ ppm?
A. 5
B. 100
C. 250
D. 500
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The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?
The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?A. 10
B. 200
C. 1000
D. 2000A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?
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 10000080% less than 200 mesh size particles are called____________________?
80% less than 200 mesh size particles are called____________________?A. Smoke
B. Powder
C. Grit
D. AggregatesWhich of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ?
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ?A. Hydrogen
B. Acetylene
C. Carbon monoxide
D. AmmoniaScale formation in boiler is controlled by____________________?
Scale formation in boiler is controlled by____________________?A. Preheating of feed water
B. Reduction in hardness, silica & alumina in feed water
C. Keeg the pH value of feed water just below 7
D. Eliminating H2S in feed waterA masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?A. Cesspool
B. Lagoon
C. Skimming mill
D. Septic tank