GATE2021 :Irrigation & Hydrology Rapid Mini Mock (App update required to attempt this test)
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Question 1
The Isohyets for annual rainfall over a catchment were drawn. The area of strips between the isohyets are indicated below
The average depth of annual precipitation over the basin is
Question 2
An infiltration gallery is placed at a depth of 5 m from the ground water table, The coefficient of permeability of soil of the aquifer is 100m/day. The drawdown of the gallery should not exceed 3 m. Find the length of the gallery if 200 m3 of water is required to be obtained per day. Assume the radius of influence to be 80 m.
Question 3
What is the maximum vertical stress(N/m^2) acting on a dam If sum of the net vertical force per unit length is 10500N/m Width of the dam is 60m, eccentricity is 15m.
Question 4
Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing 18% to the field capacity of the soil at 28%. The effective root zone of the crop is 70 cm. If the densities of the soil and water are 1.3 g/cm3 and 1.0 g/cm3 respectively, the depth of irrigation water (in mm) required for irrigating the crop is ________
Question 5
A 2 hr unit hydrograph is given. The peak ordinate of a 3 hr unit hydrograph is ____m3/s .
Question 6
Group I contains elements of canal head works and group II present the hydraulic use of such elements.
Group I
P) Undersluices
Q) Canal head regulator
R) Barrage bays
S) Fish ladder
Group II
1) regulate the supply of water in the canal
2) enables the fish to migrate to their spawning grounds upstream of the barrage
3) preserve a clear and defined river channel approaching the canal regulator.
4) are operated to release the excess water during floods.
The correct match of the items in group I with the items in group II are
Question 7
The data regarding the climate of a region from November to February is as
mentioned below-
Given that the water application efficiency is 65% and the consumptive use
coefficient is 0.58, the
field irrigation requirement for wheat is _________
Question 8
Two irrigation channel A and B are designed using Lacey’s theory. If the medium dia of silt particles are the same for both the channels and if discharge in channel A is 60% less than at B,then between these two channels
Question 9
An irrigation canal is to be designed to deliver 6.25 cumecs to meet the peak Rabi demand of a total of 5100 hectares of cropped area. The estimated canal losses are 25% of the head discharge. The duty on capacity of this canal will be
Question 10
Inflow and outflow hydrographs of channel are triangular in shape as shown in figure marking various characteristics. Find the channel storage in ha-m(round off to an integer value) at the end of 3 hrs ?
Question 11
The following figure shows the hyetograph of a 3-hr storm. The surface runoff for the event is estimated to be 38 mm. The ∅-index for the event is ___________mm/hr.
Question 12
The discharge was observed at the catchment due to two consecutive 3-hr rainfall events producing effective rainfall of 2.2cm and 3.5cm respectively.
Assuming a constant base flow of 3 m3/s. The area of catchment is ___________ km2
