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  • Question
  • The 5-day BOD of a wastewater sample is obtained as 190 mg/l (with k = 0.01 h-1). The ultimate oxygen demand (mg/l) of the sample will be


  • Options
  • A. 3800
  • B. 475
  • C. 271
  • D. 190

  • Correct Answer
  • 271 


  • GATE Exam Questions problems


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    • 1. A single rapid test to determine the pollu-tional status of river water is :

    • Options
    • A. biochemical oxygen demand
    • B. chemical oxygen demand
    • C. total organic solids
    • D. dissolved oxygen
    • Discuss
    • 2. Lysimeter and Tensiometer are used to measure respectively, one of the following groups of quantities :

    • Options
    • A. Capillary potential and permeability
    • B. Evapotranspiration and capillary potential
    • C. Velocity in channels and vapour pressure
    • D. Velocity in pipes and pressure head
    • Discuss
    • 3. A hydraulic turbine has a discharge of 5 m3/s, when operating under a head of 20 m with a speed of 500 rpm. If it is to operate under a head of 15 m, for the same discharge, the rotational speed in rpm will approximately be

    • Options
    • A. 433
    • B. 403
    • C. 627
    • D. 388
    • Discuss
    • 4. Is 459-1978 recommends to provide certain minimum steel in a RCC beam

    • Options
    • A. to ensure compression failure
    • B. to avoid rupture of steel in case a flexural failure occurs
    • C. to hold the stirrup steel in position
    • D. to provide enough ductility to the beam
    • Discuss
    • 5. Maximum size of a fillet weld for a plate of square edge is

    • Options
    • A. 1.5 mm less than the thickness of the plate
    • B. one half of the thickness of the plate
    • C. thickness of the plate itself
    • D. 1.5 mm more than the thickness of the plate
    • Discuss
    • 6. The reaction time for calculation of stopping distance may be assumed as

    • Options
    • A. 5 secs
    • B. 2.5 secs
    • C. 0.5 secs
    • D. 10.0 secs
    • Discuss
    • 7. The percentage error in the computed discharge over a triangular notch corresponding to an error of 1% in the measurement of the head over the notch, would be

    • Options
    • A. 1.0
    • B. 1.5
    • C. 2.0
    • D. 2.5
    • Discuss
    • 8. A hydraulic turbine develops a power of 104 metric horse power while running at a speed of 100 revolutions per minute, under a head of 40 m. Its specific speed is nearest to one of the following :

    • Options
    • A. 100
    • B. 628
    • C. 523
    • D. 314
    • Discuss
    • 9. A 40° slope is excavated to a depth of 10 m in a deep layer of saturated clay of unit weight 20 kN.m3; the relevant shear strength parameters are cu = 70 kN/m2 and ?u = 0. The rock ledge is at a great depth. The Taylor's stability coefficient for ?u = 0 and 40° slope angle is 0.18. The factor of safety of the slope is :

    • Options
    • A. 2.0
    • B. 2.1
    • C. 2.2
    • D. 2.3
    • Discuss
    • 10. In a compaction test, as the compaction effort is increased, the optimum moisture content

    • Options
    • A. decreases
    • B. remains same
    • C. increases
    • D. increases first and thereafter decreases
    • Discuss


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