Water Resources Engineering - Online Test

Q1. Water(γw = 9.879 kN/m3) flows with a flow rate of 0.3 m3 sec through a pipe AB of 10 m length and of uniform cross-section. The end B is above end A and the pipe makes an angle of 30o to the horizontal. For a pressure of 12 N/m2 at the end B, the corresponding pressure at the end A is
Answer : Option D
Explaination / Solution:
No Explaination.


Q2. The relationship among specific yield (Sy), specific retention (Sr) and porosity (η) of an aquifer is
Answer : Option C
Explaination / Solution:
No Explaination.


Q3. The depth of flow in a alluvial channel is 1.5 m If critical velocity ratio is 1.1 and Manning’s n is 0.018, the critical velocity of the channel as per Kenedy’s method is
Answer : Option B
Explaination / Solution:
No Explaination.


Q4. An agricultural land of 437 ha is to be irrigated for a particular crop. The base period of the crop is 90 days and the total depth of water required by the crop is 105 cm. If a rainfall of 15 cm occurs during the base period, the duty of irrigation water is
Answer : Option D
Explaination / Solution:
No Explaination.


Q5. One hour triangular unit hydrograph of a watershed has the peak discharge of 60 m3 /sec cm at 10 hours and time base of 30 hours. The Φ index is 0.4 cm per hour and base flow is 15 m3 /sec.
If there is rainfall of 5.4 cm in 1 hour, the ordinate of the flood hydrograph at 15th hour is
Answer : Option B
Explaination / Solution:
No Explaination.


Q6. A wastewater sample contains 10-5.6 mmol/L of OH- ions at 25oC The pH of this sample is
Answer : Option D
Explaination / Solution:
No Explaination.


Q7. Determine the correctness or otherwise of the following Assertion [A] and the Reason [R] : 
Assertion :The crown of the outgoing larger diameter sewer is always matched with the crown of incoming smaller diameter sewer. 
Reason : It eliminates backing up of sewage in the incoming smaller diameter sewer
Answer : Option A
Explaination / Solution:
No Explaination.


Q8. The 5-day BOD of a wastewater sample is obtained as 190 mg/L (with k = 0.01h-1). The ultimate oxygen demand (mg/L) of the sample will be
Answer : Option C
Explaination / Solution:
No Explaination.


Q9. A water treatment plant is required to process 28800 m3 /d of raw water (density=1000 kg/m3, kinematic viscosity = 10-6 m2/s). The rapid mixing tank imparts a velocity gradient of 900s-1 to blend 35 mg/L of alum with the flow for a detention time of 2 minutes. The power input (W) required for rapid mixing is
Answer : Option D
Explaination / Solution:
No Explaination.


Q10. A person standing on the bank of a canal drops a stone on the water surface. He notices that the disturbance on the water surface is not travelling upstream. This is because the flow in the canal is
Answer : Option B
Explaination / Solution:
No Explaination.