1888 + Mcqs in Upsc Civil Service Exam Questions Page 15 McqOptions

701.	Given that g = acceleration due to gravity and R = hydraulic mean depth, the Darcy Weisbach friction factor is related to Manning's rugosity coefficient 'n' as
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

Discussion

702.	Velocity in the z direction is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

Discussion

703.	The following statements relate to a laminar flow :1. Laminar flow is rotational.2. In laminar flow the loss of head is proportional to the square of the velocity.3. In laminar flow the loss of head is proportional to the first power of viscosity.4. In laminar flow the velocity is constant over the cross-section.5. Other quantities remaining the same, increase in diameter will increase the Reynolds number in laminar flow.Of these statements :
A.	1, 2 and 4 are correct
B.	1, 3 and 4 are correct
C.	1, 3 and 5 are correct
D.	2, 3 and 5 are correct
Answer» E.

Discussion

704.	A free vortex formed from originally still water, say, as when draining still water in a flat-bottomed basin by suddenly pulling the stopper at the bottom on the drain hole, will be
A.	clockwise in the northern as well as the southern hemispheres
B.	anticlockwise in the northern as well as the sourthern hemispheres
C.	anticlockwise in the northern hemisphere and clockwise in the southern hemisphere
D.	clockwise in the northern hemisphere and anticlockwise in the southern hemisphere
Answer» C. anticlockwise in the northern hemisphere and clockwise in the southern hemisphere

Discussion

705.	If a sluice gate produces a change in the depth of water from 3.0 m to 0.6 m, then the force on the gate is about
A.	9.5 kN/m
B.	19.0 kN/m
C.	38.0 kN/m
D.	76.0 kN/m
Answer» D. 76.0 kN/m

Discussion

706.	A normally consolidated clay layer settles by 25 mm when the effective stress is increased from 15 kPa to 30 kPa. If the effective stress is later increased further from 30 kPa to 60 kPa, then the additional settlement would be
A.	25 mm
B.	50 mm
C.	75 mm
D.	100 mm
Answer» B. 50 mm

Discussion

707.	A circular area of radius 'R' on the surface of a semi-infinite soil mass is uniformly loaded with a loading intensity of 'q'. The vertical stress σz directly below its centre at a depth 'z', is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

708.	In a compaction test on a soil sample, if the compaction energy is decreased (γd = maximum dry density, OMC = optimum moisture content)
A.	γd will increase with increase in OMC
B.	γd will decrease with increase in OMC
C.	γd will decrease with decrease in OMC
D.	γd will increase with decrease in OMC.
Answer» C. γd will decrease with decrease in OMC

Discussion

709.	In an otherwise symmetrical portal frame with one end fixed and the other end hinged, the large support sinks by an amount Δ. The fixed and bending moment induced at each end of the horizontal member of the frame due to the sinking of the support will be (given that 'L' is the length of the member and 'E' is the flexural stiffness)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

Discussion

710.	The kern of a circular cross-section of radius R is a concentric circular area with a radius of
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

Discussion

711.	The given figure shows the section of a wooden beam stiffened with two steel plates each of thickness 't' securely fixed to the sides. The second moment of area of the flitched beam about the X-X axis is (given: d = overall depth of the beam, b = width of the wooden section and m = modular ratio of the moduli of elasticity of steel and wood)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

Discussion

712.	In the case of a column of length 'l', moment of inertia of cross-section 'I' and Young's modulus of the material of the column 'E' being hinged at both ends, the buckling load, according to Euler's colum
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

713.	A simply supported beam AB of span 'l' has a form cross-section throughout. It carries a central concentrated load W and another load which is uniformly distributed over the entire span, its total magnitude being W. The minimum deflection in the beam is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

Discussion

714.	A cantilever is subjected to a uniformly distributed load W over its whole length 'L' and a concentrated upward force W at its free end. The deflection of the free end is
A.	zero
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

715.	For a given stress, the ratio of the moment of resistance of a beam of square section when placed with one diagonal horizontal to the moment of resistance of the same beam when placed with two sides horizontal will be
A.	[A].
B.	2
C.	1.414
D.	[D].
Answer» E.

Discussion

716.	A simply supported beam of span 'l' is loaded (as shown in the given figure) with a uniformly varying load of intensity w1/unit length at 'A' to w2/unit length at 'B'. A The shear force at the support 'B' is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

717.	In a particular material, if the modulus of rigidity is equal to the bulk modulus, then the Poisson's ratio will be
A.	[A].
B.	[B].
C.	[C].
D.	1
Answer» B. [B].

Discussion

718.	A short bar element of uniform cross-section is subjected to concentrated axial forces at its two ends. The longitudinal stress distribution on the cross-section is uniform at
A.	all sections
B.	the two ends only
C.	the mid-section only
D.	sections reasonably away from the two ends of the bar
Answer» B. the two ends only

Discussion

719.	A bar of elastic material is subjected to a direct compressive stress σ1 in the longitudinal direction. Suitable lateral compressive stress σ2 is applied along each of the other two lateral directions to limit the net strain in each of the lateral directions to half the magnitude of what it could be under σ1 acting alone. If μ is the Poisson's ratio of the material, then the magnitude of σ2 is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

720.	A particle moves with simple harmonic motion. If its acceleration at distance 'D' from the equilibrium position is 'A' then the period of the motion is given by
A.	2πAD
B.	[B].
C.	[C].
D.	[D].
Answer» E.

Discussion

721.	Two spheres of mass 15 kg and 20 kg, move along a straight line in the same direction with velocities of 20 m/s and 5 m/s, respectively. If the coefficient of restitution is 0.7, then the velocity of the 15 kg mass after collision will be
A.	5.43 m/s
B.	15.93 m/s
C.	18.72 m/s
D.	16.16 m/s
Answer» B. 15.93 m/s

Discussion

722.	A particle is moving on a plane curve with velocity v. 's' is the arc length of the particle from a fixed point on the curve and (r, θ) its position coordinates at time 't'. The transverse component of the acceleration of the particle is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

Discussion

723.	Which one of the following is the correct differential equation of the shape of the cable (similar to electrical cables) of unit weight 'q' with small slopes, as shown in the given figure ?
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

Discussion

724.	The effort 'P' to be applied horizontally to pull a weight 'W' on a plane inclined at an angle α with the horizontal is given by (tan θ is the coefficient of friction)
A.	P = W tan (α + θ)
B.	P = W tan (α - θ)
C.	[C].
D.	[D].
Answer» B. P = W tan (α - θ)

Discussion

725.	The structure shown in the given figure is stable if
A.	x = 2y
B.	2x = y
C.	2x = y
D.	x = 2y
Answer» E.

Discussion

726.	ABCD is a beam of length 5l which is supported at B and C (having supported length BC = 'l') and having two equal overhangs AB and CD of length 2l each. It carries a u.d.l. of intensity p per unit length throughout the beam as shown in the given figure.The points of contraflexure will occur
A.	at B and C
B.	no where in the beam
C.	at the mid-point of BC
D.	at the mid-points of AB and CD
Answer» D. at the mid-points of AB and CD

Discussion

727.	The given figure shows a frame to be analysed by moment distribution method. The distribution factors for members GF, GH and GD will be respectively
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

Discussion

728.	A propped cantilever of span 'l' carries uniformly distributed load of 'w' per unit over its entire span. The value of prop react to keep the beam horizontal is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

Discussion

729.	Two springs of stiffnesses KA and KB are placed on inside the other so as to compressed by the same amount under an applied axial load. The combined stiffness of the two springs will be
A.	[A].
B.	KA KB/(KA + KB)
C.	(KA + KB)/2
D.	KA + KB
Answer» E.

Discussion

730.	The shear force diagram for a simple supported beam of span 'l' is given in the figure. The maximum bending moment is
A.	[A].
B.	[B].
C.	Wl1
D.	W(l - 2l1)
Answer» D. W(l - 2l1)

Discussion

731.	A beam of circular cross-section of diameter d is subjected to a direct compressive axial load and an eccentric compressive load with eccentricity 'e'. In order that the tensile stress induced is zero the limiting region of application of the load should be shaded concentric circle of diameter
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

Discussion

732.	The deflection at the free end of a cantilever subjected to a couple M at its free end and having a uniform flexural rigidity EI throughout its length 'L' is equal to
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

Discussion

733.	A gradually applied load W is suspended by with ropes AB and CD as shown in the figure. The wires AB and CD, made of the same material and of the same cross-section are connected to a rigid block from which the load W is suspended in such a way that both the ropes stretch by the same amount. If the stress in AB and CD are p1 and p2 respectively, then the ratio - will be
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

Discussion

734.	A 600 mm long and 50 mm diameter rod of steel (E = 200 GPa, α = 12 x 10-6/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be
A.	24 MPa (compressive)
B.	72 MPa (compressive)
C.	120 MPa (tensile)
D.	144 MPa (compressive)
Answer» D. 144 MPa (compressive)

Discussion

735.	The reaction at B due to the load as shown the given figure is
A.	[A].
B.	[B].
C.	2 W
D.	3 W
Answer» B. [B].

Discussion

736.	The distance of the centroid of a semi-circle of radius r from its base is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

737.	If the standard meridian is 82°30' E and the standard time at longitude 90°E is known to be 8 hr 30 m, the corresponding local mean time at the place will be
A.	7 hr 00 m
B.	8 hr 00 m
C.	8 hr 30 m
D.	9 hr 00 m
Answer» E.

Discussion

738.	If R is the radius of the main curve, θ the angle of deflection S the shift and L the length of the transition curve, then the total tangent length of the curve is given by
A.	(R - S) tan θ/2 - L/2
B.	(R + S) tan θ/2 - L/2
C.	(R + S) tan θ/2 + L/2
D.	(R - S) tan θ/2 + L/2
Answer» D. (R - S) tan θ/2 + L/2

Discussion

739.	If the magnetic bearing of a line is 48°24' and magnetic declination is 5°38' East, then the true bearing is
A.	42° 02'
B.	42° 46'
C.	54° 02'
D.	54° 46'
Answer» D. 54° 46'

Discussion

740.	For a partially saturated soil, Δu the increase in pore water pressure, when no drainage is permitted, is expressed as (where A and B are Skempton's pore pressure parameters and Δσ1 and Δσ3 are major and minor principal stress increments)
A.	Δu = B[Δσ3 + A(Δσ1 - Δσ3)]
B.	Δu = A[Δσ3 + B(Δσ1 - Δσ3)]
C.	Δu = Δσ3 + A(Δσ1 - Δσ3)]
D.	Δu = Δσ3 + B(Δσ1 - Δσ3)]
Answer» B. Δu = A[Δσ3 + B(Δσ1 - Δσ3)]

Discussion

741.	A vane shear test on a soil sample gives a moment of total resistance M. The shear stress at failure, 'S' being more of less uniform at top bottom and surface of cylinder of soil is given by (where H = height of vane, D = Diameter of vane)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

Discussion

742.	The given figure shows the relation between void ratio and shear strain for a sand under two density conditions. The void ratio corresponding to the dashed line is called
A.	optimum void ratio
B.	critical void ratio
C.	residual void ratio
D.	undisturbed void ratio
Answer» C. residual void ratio

Discussion

743.	Critical hydraulic gradient ic is given by (where, G = specific gravity of solids e = void ratio)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

Discussion

744.	Consider the following factors pertaining to flow through soil:1. Hydraulic gradient2. Grain size3. Void ratio4. Cross-sectional area of the sample.Of these, the factors affecting permeability include
A.	1 and 4
B.	2 and 3
C.	1, 2 and 3
D.	2, 3 and 4
Answer» C. 1, 2 and 3

Discussion

745.	By using sieve analysis, the particle size distribution curve has been plotted for a particular soil. The coefficient of curvature Cc is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

Discussion

746.	The process by which a mass of saturated soil is caused by external forces to suddenly lose its shear strength and to behave as a fluid is called
A.	piping
B.	slide
C.	quick condition
D.	liquefaction
Answer» D. liquefaction

Discussion

747.	When the degree of consolidation is 50%, the time factor is about
A.	0.2
B.	0.5
C.	1
D.	2
Answer» B. 0.5

Discussion

748.	Loses deposits are formed by
A.	physical disintegration of rock
B.	constant blowing of wind from the same direction
C.	vertical deposition of glacial till
D.	chemical weathering of residual deposits.
Answer» C. vertical deposition of glacial till

Discussion

749.	Which one of the following conditions is a typical characteristic of critical flow (symbols have the usual meanings)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

Discussion

750.	The head loss caused due to sudden expansion of pipe from area A1 to area A2 and the velocity from V1 to V2 is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

Discussion

Explore topic-wise MCQs in Civil Engineering.

Given that g = acceleration due to gravity and R = hydraulic mean depth, the Darcy Weisbach friction factor is related to Manning's rugosity coefficient 'n' as

Velocity in the z direction is given by

A free vortex formed from originally still water, say, as when draining still water in a flat-bottomed basin by suddenly pulling the stopper at the bottom on the drain hole, will be

If a sluice gate produces a change in the depth of water from 3.0 m to 0.6 m, then the force on the gate is about

A normally consolidated clay layer settles by 25 mm when the effective stress is increased from 15 kPa to 30 kPa. If the effective stress is later increased further from 30 kPa to 60 kPa, then the additional settlement would be

A circular area of radius 'R' on the surface of a semi-infinite soil mass is uniformly loaded with a loading intensity of 'q'. The vertical stress σz directly below its centre at a depth 'z', is given by

In a compaction test on a soil sample, if the compaction energy is decreased (γd = maximum dry density, OMC = optimum moisture content)

The kern of a circular cross-section of radius R is a concentric circular area with a radius of

In the case of a column of length 'l', moment of inertia of cross-section 'I' and Young's modulus of the material of the column 'E' being hinged at both ends, the buckling load, according to Euler's colum

A simply supported beam AB of span 'l' has a form cross-section throughout. It carries a central concentrated load W and another load which is uniformly distributed over the entire span, its total magnitude being W. The minimum deflection in the beam is

A cantilever is subjected to a uniformly distributed load W over its whole length 'L' and a concentrated upward force W at its free end. The deflection of the free end is

For a given stress, the ratio of the moment of resistance of a beam of square section when placed with one diagonal horizontal to the moment of resistance of the same beam when placed with two sides horizontal will be

A simply supported beam of span 'l' is loaded (as shown in the given figure) with a uniformly varying load of intensity w1/unit length at 'A' to w2/unit length at 'B'. A The shear force at the support 'B' is given by

In a particular material, if the modulus of rigidity is equal to the bulk modulus, then the Poisson's ratio will be

A short bar element of uniform cross-section is subjected to concentrated axial forces at its two ends. The longitudinal stress distribution on the cross-section is uniform at

A particle moves with simple harmonic motion. If its acceleration at distance 'D' from the equilibrium position is 'A' then the period of the motion is given by

Two spheres of mass 15 kg and 20 kg, move along a straight line in the same direction with velocities of 20 m/s and 5 m/s, respectively. If the coefficient of restitution is 0.7, then the velocity of the 15 kg mass after collision will be

A particle is moving on a plane curve with velocity v. 's' is the arc length of the particle from a fixed point on the curve and (r, θ) its position coordinates at time 't'. The transverse component of the acceleration of the particle is given by

Which one of the following is the correct differential equation of the shape of the cable (similar to electrical cables) of unit weight 'q' with small slopes, as shown in the given figure ?

The effort 'P' to be applied horizontally to pull a weight 'W' on a plane inclined at an angle α with the horizontal is given by (tan θ is the coefficient of friction)

The structure shown in the given figure is stable if

ABCD is a beam of length 5l which is supported at B and C (having supported length BC = 'l') and having two equal overhangs AB and CD of length 2l each. It carries a u.d.l. of intensity p per unit length throughout the beam as shown in the given figure.The points of contraflexure will occur

The given figure shows a frame to be analysed by moment distribution method. The distribution factors for members GF, GH and GD will be respectively

A propped cantilever of span 'l' carries uniformly distributed load of 'w' per unit over its entire span. The value of prop react to keep the beam horizontal is

Two springs of stiffnesses KA and KB are placed on inside the other so as to compressed by the same amount under an applied axial load. The combined stiffness of the two springs will be

The shear force diagram for a simple supported beam of span 'l' is given in the figure. The maximum bending moment is

A beam of circular cross-section of diameter d is subjected to a direct compressive axial load and an eccentric compressive load with eccentricity 'e'. In order that the tensile stress induced is zero the limiting region of application of the load should be shaded concentric circle of diameter

The deflection at the free end of a cantilever subjected to a couple M at its free end and having a uniform flexural rigidity EI throughout its length 'L' is equal to

A 600 mm long and 50 mm diameter rod of steel (E = 200 GPa, α = 12 x 10-6/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be

The reaction at B due to the load as shown the given figure is

The distance of the centroid of a semi-circle of radius r from its base is

If the standard meridian is 82°30' E and the standard time at longitude 90°E is known to be 8 hr 30 m, the corresponding local mean time at the place will be

If R is the radius of the main curve, θ the angle of deflection S the shift and L the length of the transition curve, then the total tangent length of the curve is given by

If the magnetic bearing of a line is 48°24' and magnetic declination is 5°38' East, then the true bearing is

For a partially saturated soil, Δu the increase in pore water pressure, when no drainage is permitted, is expressed as (where A and B are Skempton's pore pressure parameters and Δσ1 and Δσ3 are major and minor principal stress increments)

A vane shear test on a soil sample gives a moment of total resistance M. The shear stress at failure, 'S' being more of less uniform at top bottom and surface of cylinder of soil is given by (where H = height of vane, D = Diameter of vane)

The given figure shows the relation between void ratio and shear strain for a sand under two density conditions. The void ratio corresponding to the dashed line is called

Critical hydraulic gradient ic is given by (where, G = specific gravity of solids e = void ratio)

Consider the following factors pertaining to flow through soil:1. Hydraulic gradient2. Grain size3. Void ratio4. Cross-sectional area of the sample.Of these, the factors affecting permeability include

By using sieve analysis, the particle size distribution curve has been plotted for a particular soil. The coefficient of curvature Cc is given by

The process by which a mass of saturated soil is caused by external forces to suddenly lose its shear strength and to behave as a fluid is called

When the degree of consolidation is 50%, the time factor is about

Loses deposits are formed by

Which one of the following conditions is a typical characteristic of critical flow (symbols have the usual meanings)

The head loss caused due to sudden expansion of pipe from area A1 to area A2 and the velocity from V1 to V2 is given by