A Best Way To Crack Gorenment Job Exams

Civil Engineering Objective Questions { Environmental Engineering }



85. The small sewers are cleaned by
A. flushing
B. cane rodding
C. wooden pills
D. none of these.

86. Pick up the correct statement from the following :
A. Small sewers are cleaned by flushing
B. Medium sewers are cleaned by cane rodding
C. Medium sewers may be cleaned by pills
D. All the above.

87. In sewers the gas generally found. Is
A. Hydrogen sulphide (H2S)
B. Carbon dioxide (CO2)
C. Methane (CH4)
D. All the above.

88. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen

89.  If the flame of a miner's safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen

90.  If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen

91. Pick up the incorrect statement from the following for allowing workers to enter sewers
A. The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
B. Proper tests for the presence of poisonous gases must be carried out
C. The men entering the manhole should be advised to smoke in the sewer
D. Warning signals should be erected

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