A. be horizontal
B. make an angle in direction of inclination of inclined plane
C. make an angle in opposite direction to inclination of inclined plane
D. any one of above is possible
✅ The correct answer is option C.
Civil Engineering Mcqs MCQs
372. A balloon lifting in air follows the following principle_________________?
A. law of gravitation
B. Archimedes principle
C. principle of buoyancy
D. all of the above
✅ The correct answer is option D.
373. The peoperty by virtue of which a liquid opposes relative motion between its different layers is called_________________?
A. surface tension
B. co-efficient of viscosity
C. viscosity
D. osmosis
✅ The correct answer is option C.
374. Which one of the following statements regarding septic tanks is wrong ?
A. A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
B. The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
C. The minimum width of septic level is 90 cm
D. The depth of tank is kept equal to its width
✅ The correct answer is option D.
375. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?
A. 100 mg/l
B. 200 mg/l
C. 300 mg/l
D. 400 mg/l
✅ The correct answer is option C.
376. A manhole is generally provided at each__________________?
A. Bend
B. Junction
C. Change of gradient
D. All the above
✅ The correct answer is option D.
377. Units of surface tension are_________________?
A. energy/unit area
B. distance
C. both of the above
D. it has no units
✅ The correct answer is option C.
378. Flow of water in a pipe about 3 meters in diameter can be measured by_________________?
A. orifice plate
B. venturi
C. rotameter
D. pitot tube
✅ The correct answer is option D.
379. In sewers the gas generally found, is_________________?
A. Hydrogen sulphide (H2S)
B. Carbon dioxide (CO2)
C. Methane (CH4)
D. All the above
✅ The correct answer is option D.
380. In SI units the power of sound is represented in __________________?
A. Kgs
B. Joules
C. Newtons
D. Watts
✅ The correct answer is option D.