Civil Engineering
Civil Engineering MCQs with Answers and Explanations
Civil engineering MCQs with answers and detailed explanations for PEC, NTS, WAPDA, PPSC and engineering job tests. Free subject-wise online practice. Take a scored quiz instead →
In geotechnical engineering, the Piping Failure under hydraulic structures like dams occurs when effective stress becomes zero due to:
AExcessive dry density of soil
BUpward seepage pressure equaling submerged unit weight of soil (Quick Condition)
CSudden reduction in groundwater table
DExcess negative pore water pressure
In structural analysis, the Castigliano’s First Theorem states that first partial derivative of total strain energy with respect to displacement gives:
ACorresponding force acting at that point
BBending moment at midspan
CSlope at support
DSupport reaction force
The Los Angeles Abrasion test on aggregates measures resistance against:
AImpact loading
BWear and surface attrition caused by mutual rubbing
CCrushing under static compressive load
DSoundness under chemical freeze-thaw
The critical tractive force (shear stress) acting on an alluvial canal bed in Lacey’s regime theory is proportional to:
AUnit weight of water * Hydraulic radius * Channel slope (gamma_w * R * S)
BDischarge / Velocity
CSilt factor / Grain size
DFroude number squared
In welded steel connections, the effective throat thickness (t) of a fillet weld with leg size ‘s’ and fusion angle 90° is given by:
A0.50 s
B0.707 s (0.7 s)
C1.00 s
D1.414 s
The Self-Cleansing Velocity standardly required in municipal sewers to prevent deposition of solid silt is approximately:
A0.15 to 0.30 m/s
B0.60 to 0.90 m/s
C2.50 to 3.00 m/s
D5.00 m/s
In water distribution networks, the Hardy Cross method uses which fundamental principle to balance loop flows?
AConservation of momentum in each pipe
BAlgebraic sum of head losses around any closed loop must equal zero (Sum hf = 0)
CVelocity head must remain constant
DReynolds number must be identical in all branches
In highway pavement design, California Bearing Ratio (CBR) test measures:
ATensile strength of subgrade soil
BRelative shear resistance of subgrade soil under controlled penetration
CModulus of subgrade reaction (K-value)
DAbrasion resistance of aggregate
Laitance on a freshly hardened concrete surface is best defined as:
AA thin layer of cement slurry mixed with fine silt/dust rising to the surface due to excess water
BEfflorescence caused by sulphate attack
CAir pockets formed by improper vibration
DSurface scaling caused by frost action
In tachometric surveying, the multiplying constant (K) and additive constant (C) for a standard stadia tachometer with an anallactic lens are:
AK = 100, C = 0
BK = 0, C = 100
CK = 100, C = 0.3 m
DK = 50, C = 0