# Practice Test: Question Set - 15

**1. The main factor which affects the infiltration capacity, is**

- (A) Thickness
of saturated layer

- (B) Depth
of surface detention

- (C) Soil
moisture

- (D) All
the above

**2. If the area of storm hydrograph is equal to 10**

^{2}cm, the ordinates of a unit hydrograph may be obtained by dividing the ordinates of the storm hydrograph by- (A) 0.5

- (B) 1

- (C) 2

- (D) 4

**3. The surface run off is due to**

- (A) Initial
rain

- (B) Residual
rain

- (C) Rain in the
net supply interval

- (D) All
the above

**4. If the velocities of flow of a stream of 10 m depth recorded by a current meter at depths of 2 m and 8 m are 0.7 m and 0.3 m respectively, the discharge per unit width of the stream in cubic metres, is**

- (A) 2

- (B) 3

- (C) 4

- (D) 5

**5. The earthen embankments constructed parallel to the river banks at some suitable distance for flood control, are known as**

- (A) Floods
walls

- (B) Dikes

- (C) Levees

- (D) Both (b) and
(c)

**6. The area of a drainage basin whose axial length is 100 km is 2500 sq. km. Its form factor is**

- (A) 0.10

- (B) 0.20

- (C) 0.25

- (D) 0.35

**7. According to Robert E. Horton, the equation of infiltration capacity curve, is (where letters carry their usual meanings)**

- (A)

*f*=

*f*(

_{c}*f*-

_{o}*f*)

_{c}*e*

^{kt}- (B)

*f*=

*f*- (

_{t}*f*-

_{o}*f*)

_{c}*e*

^{-kt}

- (C)

*f*=

*f*+ (

_{t}*f*-

_{o}*f*)

_{c}*e*

^{-kt}

- (D)

*f*=

*f*+ (

*f*-

_{o}*f*)

_{c}*e*

_{kt}**8. Consumptive use of a crop during growth, is the amount of**

- (A) Interception

- (B) Transpiration

- (C) Evaporation

- (D) All the
above

**9. Pick up the correct statement from the following:**

- (A) The
intensity of rain is the rate at which it falls

- (B) The
duration of rain is the time for which it falls with a given intensity

- (C) The
frequency of rain is the number of times, if falls

- (D) All
the above

**10. If the slope of a line for infiltration capacity curve is 1/1.737, the value of constant**

*k*in Horton's equation of infiltration capacity curve, is- (A) 2.0

- (B) 2.5

- (C) 4.0

- (D) 5.0

**11. If the grain size of soil increases**

- (A) Surface
area decreases

- (B) Specific
retention decreases

- (C) Water
supply in well increases

- (D) All
the above

**12. For determination of average annual precipitation in a catchment basin, the best method is**

- (A) Arithmetical
method

- (B) Thiessen's
mean method

- (C) Isohyetal
method

- (D) None
of these

**13. Prof. Running suggested the method for extending the discharge curve. It is known as**

- (A) Logarithmic
method

- (B) √

*y*method

- (C) General
method

- (D) None
of these

**14. If the potential infiltration of a water shed having a soil with fair pasture cover, is 10 cm and rainfall is 12 cm, the direct run off is:**

- (A) 2 cm

- (B) 3 cm

- (C) 5 cm

- (D) 7 cm

**15. Burge formula**

*Q*= 19.6 (*A*/*L*^{2/3}) cumecs is based upon- (A) Rainfall
and drainage area

- (B) Run
off and drainage area

- (C) Drainage
area and its shape

- (D) Drainage
area

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