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# Test: Hydrographs - 3

## 10 Questions MCQ Test GATE Civil Engineering (CE) 2022 Mock Test Series | Test: Hydrographs - 3

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Attempt Test: Hydrographs - 3 | 10 questions in 30 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study GATE Civil Engineering (CE) 2022 Mock Test Series for Civil Engineering (CE) Exam | Download free PDF with solutions
QUESTION: 1

Solution:
QUESTION: 2

Solution:

QUESTION: 3

### An instantaneous unit hydrograph is a direct runoff hydrograph

Solution:

A finite unit hydrograph is indicated as the duration D → 0. The limiting case of a unit hydrograph of zero duration is known as Instantaneous Unit Hydrograph (IUH).

QUESTION: 4

The shape of the recession limb of a hydrograph depends on

Solution:

The climatic factors control the rising iimb and the recession limb is independent of storm characteristics, being determined by catchment characteristics only.

QUESTION: 5

Instantaneous unit hydrograph is a hydrograph of

Solution:
QUESTION: 6

In Synder’s method of synthetic unit hydrograph development, basin lag is taken as

Solution:

The most important characteristic of a basin affecting a hydrograph due to a given storm is basin lag. Basin lag is the time difference between the centroids of the input (rainfall excess) and the output (surface runoff).

QUESTION: 7

The ordinate of the IUH of a catchment at any time t is the

Solution:
QUESTION: 8

If a 4-hour unit hydrograph of a certain basin has a peak ordinate of 80 m3/s, the peak ordinate of a 2-hour unit hydrograph for the same basin will be

Solution:

With the reduction of unit hydrograph duration, 1 cm excess rainfall will occur in reduced period. So peak ordinate of UH will increase and time base will decrease. Thus the peak ordinate of 2 hr UH will be greater than 80 m3/s.

QUESTION: 9

The point of inflection on the recession limb of a hydrograph represents

Solution:

The starting point of the recession limb, i.e., the point of inflection represents the condition of maximum storage.

QUESTION: 10

A flood-hydrograph due to an isolated storm consists of

Solution:

The hydrograph is the response of a given catchment to a rainfall implicit. It consists of flow in all the three phases of runoff, viz. surface runoff, interflow and base flow.

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