☰ Irrigation (Civil Engineering) - MCQs

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Q13.

Maximum rainfall depth of 10 cm occurring in 6h at Delhi is found to have a recurrence interval of 100 years. The probability of a 6h rain of magnitude equal to or greater than 10 cm, occurring in the next year,is :

  • A. 0.01
  • B. 0.02
  • C. 0.33
  • D. 1.00

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Q14.

DAD analysis for a catchment would indicate that :

  • A. for a given area, the maximum average depth of rainfall increases in storm duration
  • B. maximum average depth of rainfall has no relation with either the duration or the area
  • C. for a given duration storm, the maximum average depth of rainfall increases with increases in the area
  • D. for a given area, the maximum average depth of rainfall decreases with increases in storm duration

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Q15.

How many additional gauges are required in a catchment, if the error allowed in estimation of mean rainfall is to be reduced by half than the present one ?

  • A. Equal to its present number
  • B. Twice of its present number
  • C. Three times that of its present number
  • D. Four times that of its present number

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Q16.

The average annual over the whole of India is estimated as :

  • A. 51 cm
  • B. 119 cm
  • C. 143 cm
  • D. 167 cm

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Q17.

The probable maximum precipitation at a basin or a station is :

  • A. the greatest rainfall for a given duration that is physically possible
  • B. an impossible large rainfall of given duration
  • C. a rainfall of a given duration that has the maximum probability of occurence
  • D. a rainfall of a given duration that can occur with a return period 1000 years

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Q18.

If absolutely no error is allowed in the measurement of mean rainfall in a catchment, then optimum number of rain gauge stations required, would be :

  • A. zero
  • B. infinite
  • C. any value
  • D. none of these

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