14.

15.

16.

17

18.

19.

20.

21.

Most of the heavy rains in India are due to :
(A) Thunderstorms (8) Orographic precipitation
(C) Convective precipitation (D) Cyclonic precipitation

The relation between the optimum number of rain-guage stations (N), Allowable percentage
error in the calculation of mean rainfall (E) and the coefficient of variation of rainfall is :

(ಉ - ‏كيد‎ ൪ 185505
(0) N=CE നയ) 185505

The rates of rainfall for a successive 20 min period of a 60 minute rain are 2.5, 5, and
10 em/hr respectively. If the rainfall volume equals runoff volume above 2.5 cm/hr, the runoff
will be :

(^) 10/3 ‏دہ 20/8 )®( حدہ‎
)0 10/6 ‏مد‎ (D) None of the above

The recession limb of a hydrograph indicates :
(മ) Greater possibility for infiltration/runoff
(B) Surface detention and interception during a rain
(C) Uniformity of the rain
(D) Withdrawal of water from the storage within the basin

A unit hydrograph of a basin is defined as a hydrograph of direct runoff resulting from a
rainfall excess of :

(4) 1mm (ॐ) lem
(0) ணி @) 1mm*

If a 6 h unit hydrograph is added to the same 6 h unit h‘ydrograph beginning 6 h later, this
can be reduced to a 12 h unit hydrograph by dividing the ordinates by :

@ 6 തൂ 12
© 2 o 3

In stream routing, the peak outflow discharge occurs :
(ಗಿ) Later than the time when two hydrographs cross
(B) Earlier than the time when two hydrographs cross
(C) At the time when two hydrographs cross
(D) None of the above

The distance between two points measured with a 30 m chain was recorded as 100 m. It was
afterwards found that the chain was 10 cm too short. So, the true distance between the points
will be :

(ಗ) 99.666 ८ ൫ 100.333 m

(0) 100+0.333m (D) None of the above

142/2015
[P.T.0.]

യ

हि ५. नि