civil engineering MCQs – Page 142

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
2821. At the junction of sewers___________________?
comments icon0

A. Top of smaller sewer is kept lower

B. Top of larger sewer is kept lower

C. Tops of both the sewers are at the same level

D. None of these
2822. Which of the following meters is not associated with viscosity__________________?
comments icon0
A. Orsat

B. none of the above

C. Red wood

D. Engler

E. Say bolt

2823. Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?
comments icon0
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 a correct explanation of A

C. A is true but R is false

D. A is false but R is true

2824. The pH value of sewage is determined with the help of_________________?
comments icon0

A. Turbid meter

B. Imhoff Cone

C. Potentiometer

D. None of these

2825. Metacentric height is given as the distance between_______________?
comments icon0

A. center of buoyancy and metacentre

B. the center of gravity of the body and the center of pressure

C. the center of gravity of the body andthe meta center

D. the center of gravity of the body and the center of buoyancy

E. none of the above

2826. For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?
comments icon0

A. HNO3

B. None of these

C. HCl

D. H2SO4
2827. Removal of oil and grease from sewage, is known____________________?
comments icon0
A. Skimming

B. Screening

C. Filtration

D. None of these

2828. The most dangerous pollutant in vehicular emissions is____________________?
comments icon0

A. CO2

B. SO2

C. CO

D. O3

2829. In sewage, the solids in mg per litre is__________________?
comments icon0
A. 500 to 1000

B. 1000 to 1500

C. 100 to 500

D. 1500 to 2000

2830. To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
comments icon0

A. 50%

B. 55 %

C. 60%

D. 45%

2831. The minimum diameter of a sewer is kept __________________?
comments icon0

A. 20 cm

B. 25 cm

C. 15 cm

D. 10 cm

2832. The clarigesters are_________________?
comments icon0

A. Circular septic tanks

B. Circular Imhoff double tanks with bottom hoppers

C. Rectangular septic tanks

D. Circular Imhoff double storey tanks without bottom hoppers
2833. The property of a fluid which enables it to resist tensile stress is known as________________?
comments icon0

A. compressibility

B. cohesion

C. surface tension

D. viscosity.

E. adhesion

2834. Units of surface tension are_________________?
comments icon0

A. energy/unit area

B. distance

C. both of the above

D. it has no units

E. none of the above

2835. Nitrogen cycle of sewage, is____________________?
comments icon0

A. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia

B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates

C. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen

D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates

2836. In sewers the velocity of flow should not be_________________?
comments icon0

A. More than 20 m/sec

B. Less than the self-cleansing velocity

C. Less than 10 m/sec

D. More than the self-cleansing velocity

2837. The surface tension of mercury at normal temperature compared to that of water is____________________?
comments icon0

A. same

B. less

C. more or less depending on size of glass tube

D. none of the above.

E. more
2838. In sewers the gas generally found, is_________________?
comments icon0

A. Carbon dioxide (CO2)

B. Methane (CH4)

C. All the above

D. Hydrogen sulphide (H2S)

2839. The sewage treatment in septic tanks is due to__________________?
comments icon0

A. None of these

B. Parasitic decomposition

C. Aerobic decomposition

D. Anaerobic decomposition
2840. Falling drops of water become spheres due to the property of ________________?
comments icon0

A. cohesion

B. surface tension

C. adhesion

D. viscosity

E. compressibility