CE GATE 2008 - Online Test
Q1. 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.
Q2. 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.
Q3. 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.
Q4. 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.
Q5. 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.
Q6. The flow of water (mass density = 100 kg/m3 and kinematic viscosity = 10-6 m2/s) in a commercial pipe, having equivalent roughness ks as 0.12 mm, yields an
average shear stress at the pipe boundary = 600 N/m2. The value of ks/δ' (δ' being the thickness of laminar sub-layer) for this pipe is
Answer : Option D
Explaination / Solution:
No Explaination.
Q7. A rectangular channel 6.0 m wide carries a discharge of 16.0 m3/s under uniform
flow condition with normal depth of 1.60 m. Minning’s ‘n’ is 0.015.
The longitudinal slope of the channel is
Answer : Option A
Explaination / Solution:
No Explaination.
Q8. A rectangular channel 6.0 m wide carries a discharge of 16.0 m3/s under uniform flow condition with normal depth of 1.60 m. Minning’s ‘n’ is 0.015.
A hump is to be provided on the channel bed. The maximum height of the hump
without affecting the upstream flow condition is
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. A rectangular channel 6.0 m wide carries a discharge of 16.0 m3/s under uniform flow condition with normal depth of 1.60 m. Minning’s ‘n’ is 0.015.
The channel width is to be contracted. The minimum width to which the channel
can be contracted without affecting the upstream flow condition is
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. A volume of 3.0×106 m3 of groundwater was pumped form an unconfined aquifer
uniformly from an area of 5 km2. The pumping lowered the water table form
initial level of 102 m to 99 m. The specific yield of the aquifer is
Answer : Option A
Explaination / Solution:
No Explaination.
