Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the main function of cross regulator in an irrigation system?
A)
To regulate the flow from one river to another
B)
To control the water level in the main canal
C)
To divert water into different branch canals
D)
To measure the discharge in a canal
Option B is correct: To control the water level in the main canal.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Which law defines the linear relationship between stress and strain in the elastic region?
A)
Newton’s Law
B)
Poisson’s Law
C)
Hooke’s Law
D)
Rankine’s Law
Option C is correct: Hooke’s Law.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Which hydraulic structure is designed to allow water to cross a natural or artificial obstruction?
A)
Weir
B)
Canal regulator
C)
Aqueduct
D)
Escape
Option C is correct: Aqueduct.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
In a simply supported beam carrying a uniformly distributed load, where is the maximum bending moment?
A)
At the ends of the beam
B)
At the midpoint of the beam
C)
At one-quarter of the beam length
D)
At any random point
Option B is correct: At the midpoint of the beam.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Which factor does NOT significantly affect the stability of an earthen dam?
A)
Seepage control
B)
Gravity force
C)
Pore water pressure
D)
Soil compaction
Option B is correct: Gravity force.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is Poisson’s ratio?
A)
Ratio of lateral strain to axial strain
B)
Ratio of shear stress to shear strain
C)
Ratio of axial strain to lateral strain
D)
Ratio of stress to strain
Option A is correct: Ratio of lateral strain to axial strain.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why are sluice gates installed in barrages?
A)
To control the sediment flow and maintain riverbed levels
B)
To increase the storage capacity of the barrage
C)
To divert water for hydroelectric power generation
D)
To regulate the velocity of water entering the canal
Option A is correct: To control the sediment flow and maintain riverbed levels.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the main difference between a gravity dam and an arch dam?
A)
Gravity dams rely on their weight, while arch dams transfer forces to the valley walls
B)
Gravity dams require strong abutments, while arch dams do not
C)
Gravity dams are more suitable for narrow valleys than arch dams
D)
Gravity dams require less construction material than arch dams
Option A is correct: Gravity dams rely on their weight, while arch dams transfer forces to the valley walls.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why are under-sluices provided in weirs and barrages?
A)
To divert excess water during floods
B)
To control the movement of fish in the river
C)
To remove sediment from the riverbed and prevent silting
D)
To allow boats and ships to pass through
Option C is correct: To remove sediment from the riverbed and prevent silting.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why do earthen dams require more maintenance compared to concrete dams?
A)
Because they are expensive to construct
B)
Because they are susceptible to seepage and erosion
C)
Because they do not store water efficiently
D)
Because they cannot withstand high pressure
Option C is correct: Because they do not store water efficiently.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the modulus of elasticity (E) a measure of?
A)
Yield strength of the material
B)
Stiffness of the material
C)
Ductility of the material
D)
Toughness of the material
Option B is correct: Stiffness of the material.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Mohr’s Circle is used for which analysis?
A)
Beam bending
B)
Column buckling
C)
Principal stresses and strains
D)
Torsional analysis
Option C is correct: Principal stresses and strains.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
How does a siphon aqueduct differ from a normal aqueduct?
A)
A siphon aqueduct allows the river to flow above the canal
B)
A siphon aqueduct allows the canal to pass underneath a river by siphon action
C)
A siphon aqueduct requires more energy to operate than a normal aqueduct
D)
A siphon aqueduct is only used in flat terrains
Option B is correct: A siphon aqueduct allows the canal to pass underneath a river by siphon action.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the primary function of a head regulator in a canal system?
A)
To allow excess water to escape from the canal
B)
To regulate and control the entry of water into the canal from the river
C)
To store water for future use
D)
To measure the discharge of water entering the canal
Option B is correct: To regulate and control the entry of water into the canal from the river.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
A concrete beam is designed for a compressive strength of 30 MPa. What is its approximate tensile strength?
A)
1.5 MPa
B)
3.8 MPa
C)
4.5 MPa
D)
6.2 MPa
Option B is correct: 3.8 MPa.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why are cutoff walls provided in hydraulic structures like dams and weirs?
A)
To increase the storage capacity of the reservoir
B)
To allow fish to migrate upstream
C)
To improve the aesthetic appearance of the structure
D)
To prevent seepage and reduce piping failure
Option D is correct: To prevent seepage and reduce piping failure.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why are spillways essential for dams?
A)
To store additional water during floods
B)
To provide irrigation water during dry seasons
C)
To safely discharge excess water during floods to prevent dam failure
D)
To regulate sediment deposition in reservoirs
Option C is correct: To safely discharge excess water during floods to prevent dam failure.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
A canal has a discharge of 30 cumecs and a velocity of 1.5 m/s. What is the required cross-sectional area of the canal?
A)
10m²
B)
15 m²
C)
20m²
D)
25 m²
Option C is correct: 20m².
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
A dam is 80 m high, and the density of water is 1000 kg/m³. What is the hydrostatic pressure at the base of the dam? (g = 9.81 m/s²)
A)
500 kPa
B)
685 kPa
C)
785 kPa
D)
980 kPa
Option D is correct: 980 kPa.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the function of coarse aggregates in concrete?
A)
Reduce shrinkage
B)
Increase workability
C)
Increase strength and durability
D)
Act as a binding agent
Option A is correct: Reduce shrinkage.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
How much fine aggregate is required if a mix contains 1:2:4 (Cement:Sand:Coarse Aggregate) and cement weighs 300 kg?
A)
400 kg
B)
500 kg
C)
600 kg
D)
700 kg
Option C is correct: 600 kg.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why is Mohr’s Circle useful for stress analysis?
A)
It provides a graphical representation of stress and strain relationships
B)
It is used only for determining bending stress in beams
C)
It is useful only for axial loading conditions
D)
It is used to calculate the elasticity of materials
Option A is correct: It provides a graphical representation of stress and strain relationships.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why are energy dissipaters necessary at the downstream of spillways?
A)
To increase the velocity of water flow
B)
To prevent erosion and structural damage caused by high-energy water
C)
To store additional water for irrigation purposes
D)
To divert water into different canals
Option B is correct: To prevent erosion and structural damage caused by high-energy water.
Junior Engineer • 2025 • PAPER-III D (Technical Subject)
If a rain gauge recorded 50 mm of rainfall in 10 hours, what is the average intensity of rainfall?
A)
2.5 mm/hr
B)
5 mm/hr
C)
7.5 mm/hr
D)
10mm/hr
Option B is correct: 5 mm/hr.
Junior Engineer • 2025 • PAPER-III D (Technical Subject)
Irrigation canals are generally aligned along-
A)
Ridgeline
B)
Valley line
C)
Contour line
D)
Both (a) & (b) as per the design requirement
Option D is correct: Both (a) & (b) as per the design requirement.
