# Civil Engineering - GATE Exam Questions

### Exercise :: GATE Exam Questions - Section 4

1.

At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :

 A. 2 B. 1.63 C. 1 D. 0.61

Explanation:

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2.

As per IS : 800-1984 the minimum pitch of rivets in a row is recommended as the diameter of the rivet times

 A. 2 B. 2.5 C. 3 D. 4

Explanation:

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3.

The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, is

 A. The slope of the 1-hour unit hydrograph at that time B. The slope of the direct runoff unit hydrograph at that time C. Difference in the slope of the S-curve and 1-hour unit hydrograph D. The slope of the S-curve with effective rainfall intensity of 1 cm/hr

Explanation:

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4.

Water emerges from an ogee spillway with velocity 13.72 m/s and depth = 3.0 m at its toe. The tail water depth required to form a hydraulic jump at the toe is

 A. 6.48 m B. 5.24 m C. 3.24 m D. 2.24 m

Explanation:

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5.

In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20°C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :

 A. 196 mg/l B. 200 m/l C. 204 mg/l D. 208 mg/l