Civil Engineering
GATE CE purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 1271–1280 of 1300. Imported answers require independent review unless marked reviewed.
Question 51
Open questionCENAT2 marksNeeds review
An effective rainfall of 2-hour duration produced a flood hydrograph peak of 200 m³/s. The flood hydrograph has a base flow of 20 m³/s. If the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour, the peak of 2-hour unit hydrograph (in m³/s-cm, up to one decimal place) is ______.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 51
Open questionCE-2NAT2 marksNeeds review
For a given water sample, the ratio between BOD
and the ultimate BOD is 0.68. The value of the reaction rate constant
(on base
) (in day
, up to two decimal places) isLog in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 52
Open questionCENAT2 marksNeeds review
The equivalent sound power level (in dB) of the four sources with the noise levels of 60 dB, 69 dB, 70 dB and 79 dB is ______.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 52
Open questionCE-2NAT2 marksNeeds review
A municipal corporation is required to treat 1000 m
/day of water. It is found that an overflow rate of 20 m/day will produce a satisfactory removal of the discrete suspended particles at a depth of 3 m. The diameter (in meters, rounded to the nearest integer) of a circular settling tank designed for the removal of these particles would beLog in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 53
Open questionCENAT2 marksNeeds review
The spherical grit particles, having a radius of 0.01 mm and specific gravity of 3.0, need to be separated in a settling chamber. It is given that
• g = 9.81 m/s²
• the density of the liquid in the settling chamber = 1000 kg/m³
• the kinematic viscosity of the liquid in the settling chamber = 10⁻⁶ m²/s
Assuming laminar conditions, the settling velocity (in mm/s, up to one decimal place) is ______.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 53
Open questionCE-2NAT2 marksNeeds review
The analysis of a water sample produces the following results:
Ion | milligram per milli-equivalent for the ion | Concentration (mg/L) |
|---|---|---|
Ca | 20.0 | 60 |
Mg | 12.2 | 36.6 |
Na | 23.0 | 92 |
K | 39.1 | 78.2 |
Cl | 35.5 | 71 |
SO | 48.0 | 72 |
HCO | 61.0 | 122 |
The total hardness (in mg/L as CaCO
) of the water sample isLog in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 54
Open questionCENAT2 marksNeeds review
Two wastewater streams A and B, having an identical ultimate BOD are getting mixed to form the stream C. The temperature of the stream A is 20°C and the temperature of the stream C is 10°C. It is given that
• the 5-day BOD of the stream A measured at 20°C = 50 mg/l
• BOD rate constant (base 10) at 20°C = 0.115 per day
• temperature coefficient = 1.135
The 5-day BOD (in mg/l, up to one decimal place) of the stream C, calculated at 10°C, is ______.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 54
Open questionCE-2NAT2 marksNeeds review
The radii of relative stiffness of the rigid pavements P and Q are denoted by
and
, respectively. The geometric and material properties of the concrete slab and underlying soil are given below:Pavement | Length of Slab | Breadth of Slab | Thickness of Slab | Modulus of Elasticity | Poisson’s Ratio | Subgrade Reaction Modulus |
|---|---|---|---|---|---|---|
| | | Concrete | | | Soil |
P | | | | | | |
Q | | | | | | |
The ratio (up to one decimal place) of
isLog in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 55
Open questionCENAT2 marksNeeds review
The wastewater having an organic concentration of 54 mg/l is flowing at a steady rate of 0.8 m³/day through a detention tank of dimensions 2 m × 4 m × 2 m. If the contents of the tank are well mixed and the decay constant is 0.1 per day, the outlet concentration (in mg/l, up to one decimal place) is ______.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 55
Open questionCE-2NAT2 marksNeeds review
An observer standing on the deck of a ship just sees the top of a lighthouse. The top of the lighthouse is 40 m above the sea level and the height of the observer’s eye is 5 m above the sea level. The distance (in km, up to one decimal place) of the observer from the lighthouse is
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer