Two flow patterns are represented by their stream functions ψ1 and ψ2 as given below:ψ1 = x2 + y2, ψ2 = 2xy If these two patterns are superimposed on one another, the resulting streamline pattern can be represented by one of the following :

A family of parallel straight lines

The temporary hardness of water, is caused by:

bicarbonates of sodium and potassium

bicarbonates and carbonates of calcium and magnesium

bicarbonates of sodium and potassium

carbonates of calucium and magnesium

Chemical oxygen Demand (COD) of a sample is always greater than Biochemical Oxygen Demand (BOD) since it represents :

non-biodegradable organic matter

biodegradable organic matter only

biodegradable and non-biodegradable organic matter

non-biodegradable organic matter

A trickling filter is primarily a :

straining process to remove turbidity from water

straining process to remove suspended solids from sewage

biological oxidation process to remove BOD from sewage

straining process to remove turbidity from water

straining process to remove bacteria from water

Chlorine is some times used in sewage treatment

to increase biological activity of bacteria

to avoid bulking of activated sludge

Flocculation is a process

that removes algae from stabilization pond effluent

that promotes the aggregation of small particles into larger particles to enhance their removal by gravity

One of the following statements is true with regards to bodies that float or are submerged in liquids :

For a body wholly submerged in a liquid the stability is ensured if the centre of buoyancy is below the centre of gravity of the body

For a body floating in a liquid the stability is ensured if the centre of buoyancy is below the centre of gravity of the body

For a body floating in a liquid the stability is ensured if the centre of buoyancy and the centre of gravity, regardless of the relative positions of the centre of buoyancy and gravity

For a body floating in a liquid the stability is ensured if the centre of buoyancy is below the centre of gravity and the metacentre is above both the centres of gravity and buoyancy.

386 + Mcqs in Gate Exam Questions in Civil Engineering Page 3 McqOptions

101.	The total active thrust on a vertical wall 3m high retaining a horizontal sand backfill (unit weight γt = 20 kN/m3, angle of shearing resistance φ' = 30°) when the water table is at the bottom of the wall, will be:
A.	30 kN/m
B.	35 kN/m
C.	4 kN/m
D.	45 kN/m
Answer» B. 35 kN/m

102.	In which one of the following arrangements would the vertical force on the cylinder due to water be the maximum ?
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

103.	In cohesive soils the depth of tension crack (Zcr) is likely to be
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

104.	The settlement of prototype in granular material may be estimated using plate load test data from the following expression :
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

105.	A three hinged arch shown in the below figur is quarter of a circle, If the vertical and horizontal components of reaction at A are equal, the value of θ is
A.	60°
B.	45°
C.	30°
D.	None in (0°, 90°)
Answer» C. 30°

106.	The width of expansion joint gap is 2.5 cm in a cement concrete pavement. The spacing between expansion joints for a maximum rise in temperature of 25°C is, (assuming coefficient of thermal expansion of concrete as 10 x 10-6 per degree C),
A.	5 m
B.	50 m
C.	100 m
D.	25 M
Answer» B. 50 m

107.	If an ascending gradient of 1 in 50 meets another ascending gradient of 1 in 30 then the deviation angle is :
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

108.	If a single pipe of length L and diameter D is to be replaced by three pipes of same material, same length and equal diameter d (d < D), to convey the same total discharge under the same head loss, then d and D are related by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

109.	Two flow patterns are represented by their stream functions ψ1 and ψ2 as given below:ψ1 = x2 + y2, ψ2 = 2xy If these two patterns are superimposed on one another, the resulting streamline pattern can be represented by one of the following :
A.	A family of parallel straight lines
B.	A family of circles
C.	A family of parabolas
D.	A family of hyperbolas
Answer» C. A family of parabolas

110.	The depth of tension crack in a soft clay (φu = 0) is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

111.	The vertical stress at depth z, directly below the point load p is (k is a constant)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

112.	A soil mass has coefficients of horizontal and vertical permeability as 9 x 10-7 cm/s and 4 x 10-7 cm/s, respectively. The transformed coefficient of permeability of an equivalent isotropic soil mass is
A.	9 x 10-7 cm/s
B.	4 x 10-7 cm/s
C.	13 x 10-7 cm/s
D.	6 x 10-7 cm/s
Answer» E.

113.	A cantilever beam of span 'L' is loaded with a concentrated load 'P' at the free end. Deflection of the beam at the free end is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

114.	A propped cantilever beam of span L, is loaded with uniformly distributed load of intensity w/unit length, all through the span. Bending moment at the fixed end is,
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

115.	A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20°C, the DO was zero. The BOD of waste water is :
A.	700 mg/l
B.	100 mg/l
C.	cannot be determined
D.	7mg/l
Answer» B. 100 mg/l

116.	Delta (Δ) in cm. Duty (D) in hectare Cumec and Base period (B) in days are related as
A.	Δ = 864 B/D
B.	B = 864 D/Δ
C.	B = 864 Δ/D
D.	D = 8.64 B/Δ
Answer» E.

117.	The nature of contact pressure distribution under a rigid footing resting on a sandy soil and subjected to uniformly distributed load is as shown in :
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» C. [C].

118.	For the strip footing on a saturated clay, for the given failure surface as shown in the below figure, the bearing capacity equation takes the form : (where Cu - undrained shear strength φu - angle of internal friction B - width of strip footing qc - ultimate bearing capacity of soil)
A.	5.7 Cu
B.	5.14 Cu
C.	4π Cu
D.	2π Cu
Answer» C. 4π Cu

119.	Generally the maximum deflection/span ratio of a steel member should not exceed
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

120.	If φ = nominal diameter of reinforcing bar, fs = compressive stress in the bar and fbd= design bond stress of concrete, the anchorage length, La of straight bar in compression is equal to :
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

121.	The correct reinforcement-details at the corner of a rectangular water tank, in horizontal plane is shown by :
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

122.	If YY is the centroidal axis of a T beam-section subjected to plastic moment, Mp, the neutral axis lies,
A.	above the line ZZ
B.	between the lines YY and ZZ
C.	between the lines XX and YY
D.	below the line XX
Answer» C. between the lines XX and YY

123.	Rotational stiffness-coefficient, K11 for the frame having two members of equal EI/l is given by :
A.	5 EI/l
B.	6 EI/l
C.	7 EI/l
D.	8 EI/l
Answer» D. 8 EI/l

124.	M - θ relationship for a simply supported beam shown below is given by :
A.	M l/EI = 2θ
B.	M l/EI = 3θ
C.	M l/EI = 4θ
D.	M l/EI = 6θ
Answer» D. M l/EI = 6θ

125.	The effective width of a reinforced concrete T beam flange under compression, according to IS : 456-1978, given I0 is the distance between the adjacent zero moment points, b is the breadth of the rib and D is the thickness of the flange, is
A.	[A].
B.	I0 + 6D
C.	[C].
D.	[D].
Answer» B. I0 + 6D

Explore topic-wise MCQs in Civil Engineering.

The total active thrust on a vertical wall 3m high retaining a horizontal sand backfill (unit weight γt = 20 kN/m3, angle of shearing resistance φ' = 30°) when the water table is at the bottom of the wall, will be:

In which one of the following arrangements would the vertical force on the cylinder due to water be the maximum ?

In cohesive soils the depth of tension crack (Zcr) is likely to be

The settlement of prototype in granular material may be estimated using plate load test data from the following expression :

A three hinged arch shown in the below figur is quarter of a circle, If the vertical and horizontal components of reaction at A are equal, the value of θ is

The width of expansion joint gap is 2.5 cm in a cement concrete pavement. The spacing between expansion joints for a maximum rise in temperature of 25°C is, (assuming coefficient of thermal expansion of concrete as 10 x 10-6 per degree C),

If an ascending gradient of 1 in 50 meets another ascending gradient of 1 in 30 then the deviation angle is :

If a single pipe of length L and diameter D is to be replaced by three pipes of same material, same length and equal diameter d (d < D), to convey the same total discharge under the same head loss, then d and D are related by

Two flow patterns are represented by their stream functions ψ1 and ψ2 as given below:ψ1 = x2 + y2, ψ2 = 2xy If these two patterns are superimposed on one another, the resulting streamline pattern can be represented by one of the following :

The depth of tension crack in a soft clay (φu = 0) is

The vertical stress at depth z, directly below the point load p is (k is a constant)

A soil mass has coefficients of horizontal and vertical permeability as 9 x 10-7 cm/s and 4 x 10-7 cm/s, respectively. The transformed coefficient of permeability of an equivalent isotropic soil mass is

A cantilever beam of span 'L' is loaded with a concentrated load 'P' at the free end. Deflection of the beam at the free end is

A propped cantilever beam of span L, is loaded with uniformly distributed load of intensity w/unit length, all through the span. Bending moment at the fixed end is,

A waste water sample diluted to 100 times with aeration water had an initial dissolved oxygen (DO) of 7.0 mg/l and after 5 days of incubation at 20°C, the DO was zero. The BOD of waste water is :

Delta (Δ) in cm. Duty (D) in hectare Cumec and Base period (B) in days are related as

The nature of contact pressure distribution under a rigid footing resting on a sandy soil and subjected to uniformly distributed load is as shown in :

For the strip footing on a saturated clay, for the given failure surface as shown in the below figure, the bearing capacity equation takes the form : (where Cu - undrained shear strength φu - angle of internal friction B - width of strip footing qc - ultimate bearing capacity of soil)

Generally the maximum deflection/span ratio of a steel member should not exceed

If φ = nominal diameter of reinforcing bar, fs = compressive stress in the bar and fbd= design bond stress of concrete, the anchorage length, La of straight bar in compression is equal to :

The correct reinforcement-details at the corner of a rectangular water tank, in horizontal plane is shown by :

If YY is the centroidal axis of a T beam-section subjected to plastic moment, Mp, the neutral axis lies,

Rotational stiffness-coefficient, K11 for the frame having two members of equal EI/l is given by :

M - θ relationship for a simply supported beam shown below is given by :

The effective width of a reinforced concrete T beam flange under compression, according to IS : 456-1978, given I0 is the distance between the adjacent zero moment points, b is the breadth of the rib and D is the thickness of the flange, is

The influence line diagram for the force in member 'a' of the truss shown below is given by

The magnitude of the bending moment at the fixed support of the beam is equal to :

The plan of stairs supported at each end by landings spanning parallel with risers is shown in the below figure. The effective span of staircase slab is

A volume of 3.0 x 106 m3 of ground water was pumped out from an unconfined aquifer, uniformly from an area of 5 km2. The pumping lowered the water table from initial level of 102 m to 99 m. The specific yield of the aquifier is

The temporary hardness of water, is caused by:

As per IS : 800-1984 the maximum allowable slenderness ratio of compression members carrying forces resulting from dead load and superimposed load is

A direct shear test was conducted on a cohesionless soil (c = 0) specimen under a normal stress of 200 kN/m2. The specimen failed at a shear stress of 100 kN/m2. The angle of internal friction of the soil (degrees) is

Chemical oxygen Demand (COD) of a sample is always greater than Biochemical Oxygen Demand (BOD) since it represents :

In an area of 200 hectare, water table drops by 4 m. If the porosity is 0.35 and the specific retention is 0.15, change in volume of storage in the aquifer is

In a drained triaixal compression test, a saturated specimen of a cohesionless sand fails under a deviatoric stress of 3 kgf/cm2 when the cell pressure is 1 kgf/cm2 . The effective angle of shearing resistance of sand is about

A hydraulic turbine develops a power of 104 metric horse power while running at a speed of 100 revolutions per minute, under a head of 40 m. Its specific speed is nearest to one of the following :

Presence of ifluoride in water greater than permissible level of 1.5 mg/l causes

A steady discharge of 1 cumec flows uniformly in a rectangular channel 1 m wide at a depth of 250 mm. The slope of the channel bed is :

Principle involved in the relationship between submerged unit weight and saturated weight of a soil is based on

A trickling filter is primarily a :

Consistency Index for a clayer soil is [LL = Liquid Limit, PL = Plastic Limit, PI = Plas-ticity Index, W - natural moisture content]

The ratio of unconfined compressive strength of an undisturbed sample of soil to that of a remoulded sample, at the same water content, is known as :

For an anisotropic soil, permeabilities in x and y directions are kx and ky respectively in a two dimensional flow. The effective permeability keq for the soil is given by

In a river, discharge is 173 m3/s; water surface slope is 1 in 6000; and stage at the gauge station is 10.0 m. If during a flood, the stage at the gauge station is same and the water surface slope is 1 in 2000, the flood discharge in m3/s, is approximately

Chlorine is some times used in sewage treatment

Flocculation is a process

Water emerges from an ogee spillway with velocity 13.72 m/s and depth = 3.0 m at its toe. The tail water depth required to form a hydraulic jump at the toe is

The ruling minimum radius of horizontal curve of a national highway in plain terrain for ruling design speed of 100 km/hour with e = 0.07 and f = 0.15 is close to

Effective length of a rafter member between two nodes at a distance L, perpendicular to the plane of the truss, is : .

One of the following statements is true with regards to bodies that float or are submerged in liquids :

126.	The influence line diagram for the force in member 'a' of the truss shown below is given by
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» B. [B].

127.	The magnitude of the bending moment at the fixed support of the beam is equal to :
A.	P.a
B.	[B].
C.	P.b
D.	P.(a + b)
Answer» C. P.b

128.	The plan of stairs supported at each end by landings spanning parallel with risers is shown in the below figure. The effective span of staircase slab is
A.	3000 mm
B.	4600 mm
C.	4750 mm
D.	6400 mm
Answer» C. 4750 mm

129.	A volume of 3.0 x 106 m3 of ground water was pumped out from an unconfined aquifer, uniformly from an area of 5 km2. The pumping lowered the water table from initial level of 102 m to 99 m. The specific yield of the aquifier is
A.	0.2
B.	0.3
C.	0.4
D.	0.5
Answer» B. 0.3

130.	The temporary hardness of water, is caused by:
A.	dissolved carbondioxide
B.	bicarbonates and carbonates of calcium and magnesium
C.	bicarbonates of sodium and potassium
D.	carbonates of calucium and magnesium
Answer» C. bicarbonates of sodium and potassium

131.	As per IS : 800-1984 the maximum allowable slenderness ratio of compression members carrying forces resulting from dead load and superimposed load is
A.	180
B.	250
C.	300
D.	400
Answer» B. 250

132.	A direct shear test was conducted on a cohesionless soil (c = 0) specimen under a normal stress of 200 kN/m2. The specimen failed at a shear stress of 100 kN/m2. The angle of internal friction of the soil (degrees) is
A.	26.6
B.	29.5
C.	30
D.	32.6
Answer» B. 29.5

133.	Chemical oxygen Demand (COD) of a sample is always greater than Biochemical Oxygen Demand (BOD) since it represents :
A.	biodegradable organic matter only
B.	biodegradable and non-biodegradable organic matter
C.	non-biodegradable organic matter
D.	inorganic matter
Answer» C. non-biodegradable organic matter

134.	In an area of 200 hectare, water table drops by 4 m. If the porosity is 0.35 and the specific retention is 0.15, change in volume of storage in the aquifer is
A.	160 m3
B.	1.6 x 106 m
C.	8 x 106 m3
D.	1.6 x 103 m3
Answer» C. 8 x 106 m3

135.	In a drained triaixal compression test, a saturated specimen of a cohesionless sand fails under a deviatoric stress of 3 kgf/cm2 when the cell pressure is 1 kgf/cm2 . The effective angle of shearing resistance of sand is about
A.	37¬∞
B.	45¬∞
C.	53¬∞
D.	20¬∞
Answer» B. 45¬∞