491. A heavy stone is suitable for________________? A. arches B. rubble masonry C. roads D. retaining walls ✅ The correct answer is option D.
492. Design period of 40 to 50 years is adopted for_________________? A. Branch sewers B. Main sewers C. Trunk sewers D. All the above ✅ The correct answer is option D.
493. Drop manholes are the manholes___________________? A. Without entry ladders B. Without manhole covers C. With depths more than 3.5 m D. Having drains at different levels ✅ The correct answer is option D.
494. Which one of the following statements is correct ? A. The function of an information system is to improve one s ability to make decisions B. The information system is the chain of operations C. A map is a collection of stored, analysed data, its stored information is suitability used in making decisions D. All the above ✅ The correct answer is option D.
495. The water carried sewerage system removes__________________? A. Domestic sewage B. Industrial sewage C. Storm sewage D. All the above ✅ The correct answer is option D.
496. The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as_________________? A. one dimensional flow B. uniform flow C. steady flow D. turbulent flow ✅ The correct answer is option D.
497. The sewers___________________? A. Must be of adequate size to avoid over flow B. Must flow under gravity ½ to ¾ full C. Must be laid at least 2 to 3 m deep to collect /water from the basements D. All the above ✅ The correct answer is option D.
498. The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to________________? A. 1 Pa B. 91Pa C. 981 Pa D. 9810 Pa ✅ The correct answer is option D.
499. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________? A. 30 minutes B. 1 hour C. 1 hour and 30 minutes D. 2 hours ✅ The correct answer is option D.
500. For a continuous flow type of sedimentation tanks__________________? A. Width of the tank is normally kept about 6 m B. Length of the tank is normally kept 4 to 5 times the width C. Maximum horizontal flow velocity is limited to 0.3 m/minute D. All the above ✅ The correct answer is option D.