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  • Question

  • Activated sludge is the


  • Options
  • A. resultant sludge removable from the aeration unit
  • B. sludge settled in the humus tank
  • C. sludge in the secondary tank post-aeration rich in microbial mass
  • D. sludge.in the secondary tank post aeration, rich in nutrients.

  • Correct Answer
  • sludge in the secondary tank post-aeration rich in microbial mass 

    • UPSC Civil Service Exam Questions problems

    Search Results

    • 1. Consider the following statements :
      1. An ascending gradient of 1 in 100 meets an ascending gradient of 1 in 120 to form a Valley curve.
      2. A falling gradient of 1 in 25 meets a falling gradient of 1 in 50 to form a summit curve.
      3. The length of summit curve is determined on the basis of head light sight distance.
      Which one of the statements given above is/are correct?

    • Options
    • A. 1 and 2
    • B. 2 and 3
    • C. 1 and 3
    • D. 2 only
      • Discuss
    • 2. The figure refers to a channel section of uniform thickness of 1 cm used as a beam with the cross-sectional dimensions shown in cm units. If the Moment of Inertia of channel Ixx be equal to 246 cm4 and C be the shear centre, then the value of e in cm is equal to

    • Options
    • A. 1.5
    • B. 2.5
    • C. 2.25
    • D. 1.67
      • Discuss
    • 3. The plastic modulus of a section is 5 x 10-4m3. Its shape factor is 1.2 and the plastic moment capacity is 120 kNm. What is the value of the yield stress of the material?

    • Options
    • A. 100 N/mm2
    • B. 200 N/mm2
    • C. 240 N/mm2
    • D. 288 N/mm2
      • Discuss
    • 4. A close-coiled helical spring with n coils, mean radius R and diameter d is subjected to an axial load W. What is the compression in the spring?

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. The graphical condition for equilibrium of concurrent forces is that

    • Options
    • A. both the force polygon and the funicular polygon must be closed figures
    • B. funicular polygon should be a closed figure
    • C. force polygon need not be a closed figure
    • D. force polygon should be a closed figure
      • Discuss
    • 6. The given figure shows gradually varied flow in an open channel with a beak in bed slope. Types of water surface profiles occurring from left to right are

    • Options
    • A. H2 , S3
    • B. H2 , S2
    • C. H2 , M2
    • D. H3 , M2
      • Discuss
    • 7. For total reaction time of 2.5 seconds, coefficient of friction 0.35, design speed 80 km/h, what is the stopping sight distance on a highway?

    • Options
    • A. 127 m
    • B. 132 m
    • C. 76 m
    • D. 56 m
      • Discuss
    • 8. Which are the critical activities of the bar chart shown above?

    • Options
    • A. Activities B and E
    • B. Activities A, D and F
    • C. Activities A, C and E
    • D. Activities A and F
      • Discuss
    • 9. What is the use of a station pointer?

    • Options
    • A. For making soundings in water bodies
    • B. For plotting of soundings in harbour area
    • C. For marking sunken shipping hazards
    • D. For making tidal observations
      • Discuss
    • 10. Consider the following methods of preservation of timber :
      1. Dipping
      2. Brushing or spraying
      3. Pressure impregnation
      The correct sequence in decreasing order of the effectiveness of these methods of preservation is

    • Options
    • A. 1, 2, 3
    • B. 2, 1, 3
    • C. 3, 1, 2
    • D. 3, 2, 1
      • Discuss

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