Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the primary purpose of a superplasticizer in concrete?
A)
Increase strength
B)
Increase workability without changing water content
C)
Reduce setting time
D)
Replace cement
Option B is correct: Increase workability without changing water content.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
The torsional stress in a shaft is directly proportional to:
A)
Shaft radius
B)
Square of shaft radius
C)
Cube of shaft radius
D)
Fourth power of shaft radius
Option A is correct: Shaft radius.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the primary cause of shrinkage in concrete?
A)
Loss of water during hydration
B)
Excess cement
C)
Excessive aggregates
D)
High curing time
Option A is correct: Loss of water during hydration.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
A canal section is designed with a discharge of 100 cumecs and an average velocity of 2 m/s. What is the required cross-sectional area of the canal?
A)
25m²
B)
200 m²
C)
100 m²
D)
50m²
Option D is correct: 50m².
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
If a masonry dam is 50 m high and the water density is 1000 kg/m³, what is the pressure at the base due to the water column? (g= 9.81 m/s²)
A)
245 kPa
B)
345 kPa
C)
490 kPa
D)
981 kPa
Option C is correct: 490 kPa.
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)
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)
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)
What does the shear force diagram of a cantilever beam with a point load at its free end look like?
A)
A parabolic curve
B)
A horizontal line
C)
A straight line with a sudden drop
D)
A triangular shape
Option B is correct: A horizontal line.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
A canal has a duty of 2000 hectares per cumec and a base period of 120 days. What is the required delta (in meters)?
A)
1.04m
B)
0.52m
C)
2.07m
D)
3.45m
Option B is correct: 0.52m.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
If the water content in a 1m³ concrete mix is 180 kg and the water-cement ratio is 0.45, what is the cement content?
A)
300kg
B)
350 kg
C)
400 kg
D)
450kg
Option C is correct: 400 kg.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why are stepped spillways used in dams?
A)
They help dissipate kinetic energy and reduce erosion
B)
They increase the storage capacity of the dam
C)
They facilitate easy maintenance of the spillway
D)
They reduce the overall weight of the dam structure
Option A is correct: They help dissipate kinetic energy and reduce erosion.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Which factor is the most critical in designing spillways for dams?
A)
Length of the dam
B)
Expected peak flood discharge
C)
Type of construction material
D)
Width of the river
Option B is correct: Expected peak flood discharge.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the main disadvantage of high-strength concrete?
A)
Low durability
B)
Low compressive strength
C)
High permeability
D)
Increased brittleness
Option D is correct: Increased brittleness.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Under-sluices are usually provided:
A)
At the extreme left of the barrage
B)
At the extreme right of the barrage
C)
Just adjacent to the canal head regulator
D)
In the middle of the barrage
Option C is correct: Just adjacent to the canal head regulator.
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)
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)
Euler’s buckling formula is applicable for which type of columns?
A)
Short columns
B)
Intermediate columns
C)
Long columns
D)
All columns
Option C is correct: Long columns.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Which type of cement is best suited for marine construction?
A)
Ordinary Portland Cement (OPC)
B)
Rapid Hardening Cement
C)
Sulphate Resistant Cement
D)
White Cement
Option C is correct: Sulphate Resistant Cement.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
What is the primary purpose of river guide bunds in river training works?
A)
To store excess floodwater
B)
To prevent riverbank erosion and guide the river flow
C)
To measure the depth of the river channel
D)
To create artificial islands in rivers
Option B is correct: To prevent riverbank erosion and guide the river flow.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why is seepage control essential in earthen dams?
A)
To maintain a stable water level in the reservoir
B)
To prevent water loss and structural failure due to internal erosion
C)
To increase the storage capacity of the dam
D)
To improve the water quality in the reservoir
Option B is correct: To prevent water loss and structural failure due to internal erosion.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
Why does a column buckle instead of crushing under high axial loads?
A)
Because the material strength is very low
B)
Because the weight of the column increases its instability
C)
Because long and slender columns experience instability before reaching their compressive strength
D)
Because the column is too short
Option C is correct: Because long and slender columns experience instability before reaching their compressive strength.
Junior Engineer • 2025 • Paper-IV A (Technical Subject)
A hydraulic structure releases water at a flow rate of 500 cumecs over a spillway with a height of 20 m. Using or adopting Torricelli’s theorem calculate the theoretical velocity of the released water.
A)
12.5 m/s
B)
14 m/s
C)
19.8 m/s
D)
22 m/s
Option C is correct: 19.8 m/s.
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)
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.
