Civil Engineering Mcqs

A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?

• (A)  0.30 m/sec
• (B)  0.35 m/sec
• (C)  0.40 m/sec
• (D)  0.45 m/sec

Answer

Submitted By :Ali Uppal

The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________?

• (A)  House sewer
• (B)  Lateral sewer
• (C)  Branch sewer
• (D)  Sewer outfall

Answer

Submitted By :Ali Uppal

The most dangerous pollutant in vehicular emissions is____________________?

• (A)  CO
• (B)  SO2
• (C)  CO2
• (D)  O3

Answer

Submitted By :Ali Uppal

For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________?

• (A)  100 cm
• (B)  120 cm
• (C)  140 cm
• (D)  160 cm

Answer

Submitted By :Ali Uppal

The asbestos cement pipes are generally laid___________________?

• (A)  Horizontally
• (B)  Vertically
• (C)  At an angle of 30°
• (D)  At an angle of 60°

Answer

Submitted By :Ali Uppal

A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________?

• (A)  Carbondioxide gas
• (B)  Hydrogen sulphide gas
• (C)  Methane gas
• (D)  Petrol vapours

Answer

Submitted By :Ali Uppal

If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is_________________?

• (A)  50 mg/l
• (B)  100 mg/l
• (C)  150 mg/l
• (D)  250 mg/l

Answer

Submitted By :Ali Uppal

A circular sewer section is preferred to because__________________?

• (A)  It is cheaper in construction
• (B)  It provides maximum area for a given perimeter
• (C)  It provides maximum hydraulic mean depth
• (D)  All the above

Answer

Submitted By :Ali Uppal

In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________?

• (A)  5
• (B)  10
• (C)  15
• (D)  20

Answer

Submitted By :Ali Uppal

In case of sewer lines_________________?

• (A)  Water test is carried out to check water tightness of the joints
• (B)  Test for straightness is carried out with the help of a lamp and mirror
• (C)  Obstruction test is carried out with the help of smooth ball of diameter 13 mm
• (D)  All the above

Answer

Submitted By :Ali Uppal