GATE CE Hydrology PYQs & Answers

Questions 1–10 of 49. Imported answers require independent review unless marked reviewed.

Following statements are made with respect to the mass curve of rainfall:

(I) Slope at a point on the curve can be positive. (II) Slope at a point on the curve can be zero.

Which one of the following options is CORRECT?

Your answerChoose one option.

Both statements (I) and (II) are TRUE.

Both statements (I) and (II) are FALSE.

Statement (I) is TRUE and statement (II) is FALSE.

Statement (I) is FALSE and statement (II) is TRUE.

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The probability (in %) that a storm having return period of 15 years may occur in the next 10 years is _____ (rounded off to two decimal places).

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Types of flood routing and methods are given in the table below.

Column 1 — Type of Flood Routing: (P) Hydrologic routing (Q) Hydraulic routing (R) Reservoir routing (S) Channel routing

Column 2 — Method: (i) Muskingum method (ii) Modified Pul’s method (iii) Method of Characteristics

Option(s) giving the CORRECT match(es) between Column 1 and Column 2 is/are:

Your answerSelect all correct options. You can choose more than one.

(P) – (i) ; (Q) – (iii) ; (R) – (ii)

(Q) – (i) ; (R) – (iii) ; (S) – (ii)

(P) – (i) ; (R) – (ii) ; (S) – (i)

(P) – (ii) ; (Q) – (iii) ; (R) – (ii)

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A fully-penetrating well of 20 cm diameter is provided in an unconfined aquifer. The height of the ground water table is 30 m from the bottom of the aquifer. After a long period of pumping at a rate of 3 m

/s, the drawdown in the observation wells at 10 m and 100 m from the pumped well is 12 m and 11 m, respectively. The transmissivity (in m

/s) of the aquifer is _____ (rounded off to one decimal place).

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A bridge with an expected life of 50 years is designed for a flood of 1000 m

/s corresponding to the return period of 100 years. The risk associated with this design is __________ (rounded off to two decimal places).

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The intensity-duration relationship for a rainfall on a rectangular plot ABCD of area 7 ha (1 ha = 10⁴ m²) can be modeled by the following equation:

where I is rainfall intensity (in cm/h), and t is the duration (in minutes) of rainfall. The average runoff coefficient over the area is 0.60. The time of entry (in minutes) to the outfall from the corners A, B, C, and D are 10, 20, 15 and 25, respectively.

The design flowrate (in m³/h) of the storm-sewer at the outfall is _____ (in integer).

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To derive the total flood hydrograph at a catchment outlet from an isolated storm, the order in which the following methods are applied, from the first method to the last method, is

P. Obtaining the hyetograph

Q. Addition of baseflow

R. Estimation of initial and infiltration losses

S. Application of unit hydrograph

Your answerChoose one option.

PRSQ

PQRS

RPSQ

PSQR

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In the context of the effect of drainage density on the run-off generation and the hydrograph at the catchment outlet, all other factors remaining the same, pick one or more CORRECT statement(s) from the choices given below.

Your answerSelect all correct options. You can choose more than one.

Lower drainage density results in higher peak in flood hydrograph compared to that when the drainage density is higher.

Lower drainage density results in lower peak in flood hydrograph compared to that when the drainage density is higher.

Lower drainage density results in a flood hydrograph with a longer time base compared to that when the drainage density is higher.

Lower drainage density results in a flood hydrograph with a shorter time base compared to that when the drainage density is higher.

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A water resources project with an expected life of 25 years has to be designed for an acceptable risk of 5% against a design flood. The return period for the design flood (in years) is __________ (rounded off to the nearest integer).

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The mean rainfall over a catchment has to be estimated. The data for four rain gauges located in and around the catchment is listed in the table. Which one of the following statements is correct:

Rain gauge station	P	Q	R	S
Whether located inside the catchment	Yes	Yes	Yes	No
Theissen weightage factor	0.25	0.50	0.10	0.15
Rainfall (mm)	100	110	100	125

Your answerChoose one option.

The estimate obtained from the Thiessen-mean method is greater than that obtained using the arithmetic-mean method

The estimate obtained from the Thiessen-mean method is equal to that obtained using the arithmetic-mean method

The estimate obtained from the Thiessen-mean method is less than that obtained using the arithmetic-mean method

The Thiessen-mean method cannot be applied in this case

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GATE CE Hydrology PYQs

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