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  • Question

  • Biochemical oxygen demand (BOD) of waste water is a measure of


  • Options
  • A. total concentration of a biochemicals
  • B. total concentration of organic matter
  • C. concentration of biodegradable organic matter
  • D. concentration of chemically oxidisable matter

  • Correct Answer
  • concentration of biodegradable organic matter 

    • GATE Exam Questions problems

    Search Results

    • 1. A stable channel is to be designed for a discharge of Q m3 /s with silt factor f as per Lacey's method. The mean flow velocity (m/s) in the channel is obtained by

    • Options
    • A. (Qf2/140)1/6
    • B. (Qf/140)1/3
    • C. (Q2f2/140)1/6
    • D. 0.48 (Q/f)1/3
      • Discuss
    • 2. The water surface profile resulting from flow underneath the gate in the below figure is :

    • Options
    • A. H3
    • B. M1
    • C. H2
    • D. S2
      • Discuss
    • 3. A pre-tensioned concrete member of section 200 mm x 250 mm contains tendons of area 500 mm2 at centre of gravity of the section. The prestress in the tendons is 1000 N/mm2. Assuming modular ratio as 10, the stress (N/mm2) in concrete is

    • Options
    • A. 11
    • B. 9
    • C. 7
    • D. 5
      • Discuss
    • 4. Generally the maximum deflection/span ratio of a steel member should not exceed

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 5. In a river, discharge is 173 m3/s; water surface slope is 1 in 6000; and stage at the gauge station is 10.0 m. If during a flood, the stage at the gauge station is same and the water surface slope is 1 in 2000, the flood discharge in m3/s, is approximately

    • Options
    • A. 371
    • B. 100
    • C. 519
    • D. 300
      • Discuss
    • 6. While deriving an expression for loss of head due to a sudden expansion in a pipe, in addition to the continuity and impulse-momentum equations, one of the following assumptions is made :

    • Options
    • A. Head loss due to friction is equal to the head loss in eddying motion
    • B. The mean pressure in eddying fluid is equal to the downstream pressure
    • C. The mean pressure in eddying fluid is equal to the upstream pressure
    • D. Head lost in eddies is neglected
      • Discuss
    • 7. A light house of 120 m height is just visible above the horizon from a ship. The correct distance (m) between the ship and the light house considering combined correction for curvature and refraction, is

    • Options
    • A. 39.098
    • B. 42.226
    • C. 39098
    • D. 42226
      • Discuss
    • 8. The most important water quality parameter for domestic use of water is

    • Options
    • A. carbonate hardness
    • B. non-carbonate hardness
    • C. coliform group of organisms
    • D. chlorides
      • Discuss
    • 9. For the structure shown below, the vertical deflection at point A is given by

    • Options
    • A.
    • B.
    • C. Zero
    • D.
      • Discuss
    • 10. The unit weight of a soil at zero air voids depends on :

    • Options
    • A. specific gravity
    • B. water content
    • C. unit weight of water
    • D. all the above
      • Discuss

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