Hydrology and Ground Water

171. The recurrence interval (R.I.) of 20 cm rain storm at a place is 5 years.

  1. The place will definitely have 20 cm rain storm after every five years
  2. The place may have 20 cm rain storm after every five years
  3. The place may have 20 cm rain storm within a set of 5 years twice
  4. None of these

Correct answer: (B)
The place may have 20 cm rain storm after every five years

172. The respective storm totals at three surrounding stations A, B and C are 110, 90 and 70 mm. If the normal annual precipitation amounts at stations X, A, B and C are respectively 1000, 1100, 1200 and 1250 mm, the estimated storm precipitation at X is

  1. 75 mm
  2. 77 mm
  3. 79 mm
  4. 81 mm

Correct answer: (B)
77 mm

173. The run off a drainage basin is

  1. Initial recharge + ground water accretion + precipitation
  2. Precipitation + ground water accretion + initial recharge
  3. Precipitation - ground water accretion + initial recharge
  4. Precipitation - ground water accretion - initial recharge

Correct answer: (D)
Precipitation - ground water accretion - initial recharge

174. The run off is affected by

  1. Size of the basin
  2. Shape of the basin
  3. Elevation of the water shed
  4. All the above

Correct answer: (D)
All the above

175. The runoff is affected by

  1. Type of precipitation
  2. Rain intensity and duration of rainfall
  3. Rain distribution and soil moisture deficiency
  4. All the above

Correct answer: (D)
All the above

176. The sensitivity of a rigid module is

  1. Zero
  2. Between zero and one
  3. 1
  4. Infinity

Correct answer: (A)
Zero

177. The shape of recession limb of a hydrograph depends upon

  1. Basin characteristics only
  2. Storm characteristics only
  3. Both (A) and (B)
  4. None of the above

Correct answer: (A)
Basin characteristics only

178. The specifications of most commonly used standard gauges in India, are

  1. 200 sq. cm collector and 4 litres bottle
  2. 100 sq. cm collector and 2 litres bottle
  3. 200 sq. cm collector and 10 litres bottle
  4. 100 sq. cm collector and 4 litres bottle

Correct answer: (A)
200 sq. cm collector and 4 litres bottle

179. The stage of river carrying a discharge of Q m/sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood same point and same stage of 10 m with a water surface slope of (1/1000) will be

  1. V2Qm3/sec
  2. 0.5 Q m3/sec
  3. 2 Q m3/sec
  4. 4 Q m3/sec

Correct answer: (C)
2 Q m3/sec

180. The standard height of a standard rain gauge, is

  1. 10 cm
  2. 20 cm
  3. 30 cm
  4. 50 cm

Correct answer: (C)
30 cm

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