Civil Engineering MCQs

2965 MCQs (Page 264 of 297)

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The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?

A. 1 in 100 upward
B. 1 in 500 upward
C. 1 in 100 downward
D. 1 in 503 upward

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Dilution method of disposing of sewage, is not preferred to_______________?

A. When sewage is fresh
B. When diluting water has high dissolved oxygen content
C. When diluting water is used for water supply near the point of sewage disposed
D. When the diluting water is having flow currents

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In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?

A. Q/(b × d)
B. Q/(l × d)
C. Q/l
D. Q/(b × l)

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Sewer ventilating columns are generally placed at_______________?

A. Distances 150 m to 300 m
B. Upper ends of branch sewers
C. Every change in the size of sewers
D. All the above

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In sewers the effect of scouring is more on__________________?

A. Top side
B. Bottom side
C. Horizontal side
D. All sides

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In sewers the velocity of flow should not be_________________?

A. More than the self-cleansing velocity
B. Less than the self-cleansing velocity
C. Less than 10 m/sec
D. More than 20 m/sec

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For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?

A. H2so4
B. Hno3
C. Hcl
D. None of these

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The pH value of sewage is determined with the help of_________________?

A. Imhoff cone
B. Turbid meter
C. Potentiometer
D. None of these

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To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?

A. 45 %
B. 50 %
C. 55 %
D. 60 %

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The factor responsible for purification of sewage in river is________________?

A. Hydrology
B. Dissolved oxygen in water
C. Temperature
D. All the above

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