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  • Question

  • The temporary hardness of water, is caused by:


  • Options
  • A. dissolved carbondioxide
  • B. bicarbonates and carbonates of calcium and magnesium
  • C. bicarbonates of sodium and potassium
  • D. carbonates of calucium and magnesium

  • Correct Answer
  • bicarbonates and carbonates of calcium and magnesium 

    • GATE Exam Questions problems

    Search Results

    • 1. At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :

    • Options
    • A. 2.0
    • B. 1.63
    • C. 1.00
    • D. 0.61
      • Discuss
    • 2. The parameters in Horton's infiltration equation are given as, fo = 7.62 cm/hour, fc = 1.34 cm/hour and k = 4.182/hour. For assumed continuous ponding the cumulative infiltration at the end of 2 hours is

    • Options
    • A. 2.68 cm
    • B. 1.50 cm
    • C. 1.34 cm
    • D. 4.18 cm
      • Discuss
    • 3. In cohesive soils the depth of tension crack (Zcr) is likely to be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. If the pump head is 75 m, discharge is 0.464 m3/s and the motor speed is 1440 rpm at rated condition, the specific speed of the pump is about

    • Options
    • A. 4
    • B. 26
    • C. 38
    • D. 1440
      • Discuss
    • 5. Bituminous materials are used in highway construction primarily because of their :

    • Options
    • A. cementing and water-proofing properties
    • B. load bearing capacity
    • C. high specific gravity
    • D. black colour which facilitates road markings
      • Discuss
    • 6. The expression for the specific speed of a pump :

    • Options
    • A. does not include the diameter of the impeller
    • B. yields larger values for radial pumps than for axial flow pump
    • C. is necessarily non dimensional
    • D. includes power as one of the variables
      • Discuss
    • 7. The modulus of rupture of concrete gives

    • Options
    • A. the direct tensile strength of the concrete
    • B. the direct compressive strength of the concrete
    • C. the tensile strength of the concrete under bending
    • D. the characteristic strength of the concrete
      • Discuss
    • 8. The most commonly used sampler for obtaining a disturbed sample of the soil is

    • Options
    • A. split spoon sampler
    • B. open drive sampler
    • C. piston sampler
    • D. thin wall shelby tube sampler
      • Discuss
    • 9. Two samples of water A and B have pH values of 4.4 and 6.4 respectively. How many times more acidic sample A is than sample B?

    • Options
    • A. 0
    • B. 50
    • C. 100
    • D. 200
      • Discuss
    • 10. A direct runoff hydrograph due to an isolated storm with an effective rainfall of 2 cm was trapezoidal in shape as shown in the below figure. The hydrograph corresponds to a catchment area (in sq. km) of

    • Options
    • A. 790.2
    • B. 599.4
    • C. 689.5
    • D. 435.3
      • Discuss

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