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Civil Engineering Objective Questions { Environmental Engineering }



351. Consider the following statements regarding cast iron sewers 1. These are used for out fall sewers for rising mains of pumping stations 2. These are used under heavy traffic loads 3. These are used over trestles in low lying areas 4. These are 100% leak proof Of these statements:
A. 1 alone is correct
B.1 and 3 are correct
C. 1, 2 and 3 are correct
D. 1, 2, 3 and 4 are correct
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352.  Consider the following statements regarding the laying of the sewer pipes :Assertion A: The sewer pipes are generally laid starting from their outfall ends towards their starting ends Reason R : Tail sewers can be used during the initial periods of the construction Of these statements:
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true.
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353.  Consider the following statements regarding the design of inverted siphon in the sewers 1. Inlet chamber and outlet chambers are provided at either end of the inverted siphon 2. A self cleansing velocity of 0.45 m/sec even during minimum discharge is ensured 3. For sanitary sewers, two pipe lines are provided, one for minimum dry weather and the other for maximum dry weather flow 4. In long inverted siphon, hatch boxes at interval of about 30 m are provided. Of these statements:
A. 1 alone is correct
B. 2 and 4 are correct
C. 1 and 3 are correct
D. All of these are correct
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354.  Consider the following statements regarding the foul gases in the sewers 1. Hydrogen sulphide (112S) is evolved 2. Carbon dioxide (CO2) is evolved 3. Methane is evolved 4. Oxygen is evolved Of these statements:
A. 1 and 2 are correct
B. 2 and 3 are correct
C. 3 and 4 are correct
D. 1, 2 and 3 are correct
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355.  Consider the following statements regarding ventilating column of sewers : I. A covel is provided at the top of the shaft for the escape of gases into the atmosi:there 2. A ventilating column is used near the street lamp posts 3. The diameter of the ventilating column is preferably kept equal to one third of the diameter of the sewer 4. The ventilating columns are generally kept lower than the height of noarby structures Of these statements:
A. 1 alone is correct
B. 1 and 2 are correct 1 and 4 are correct
C. 2 and 3 are correct
D. 1, 2 and 3 are correct
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356. Consider the following statements regarding the bacteria present in municipal sewage 1. Aerobic bacteria flourish in the presence of free oxygen 2. Anaerobic bacteria flourish in the absence of free oxygen 3. Facultative bacteria flourish both in the presence as well as absence of free oxygen Of these statements:
A. 1 alone is correct
B. 2 alone is correct
C. 1 and 2 are correct
D. 1, 2 and 3 are correct
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357. Consider he following stages in Nitrogen cycle under aerobic oxidation 1. Formation of Nitraes 2. Formation of Ammonia 3. Formation of Nitrites 4. F'hotosynthsis The correct sequence of the stages is
A. 1,4,2,3
B. 2,3,1,4
C. 1,2,3,4
D. 4,3,2,1
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