A linear relationship is observed between speed and density on a certain section of a highway. The free flow speed is observed to be 80 km per hour and the jam density is estimated as 100 vehicles per km length. Based on the above relationship, the maximum flow expected on this section and the speed at the maximum flow will respectively be

8000 vehicles per hour and 80 km per hour

8000 vehicles per hour and 25 km per hour

2000 vehicles per hour and 80 km per hour

2000 vehicles per hour and 40 km per hour

Flow at critical depth takes place in an open channel When

discharge is minimum for a given specific energy

for a given specific energy, discharge is maximum

for a given discharge, specific energy is maximum

discharge is minimum for a given specific energy

discharge is maximum for a given specific force

Coagulation-flocculation with alum is performed :

immediately before chlorination

Bituminous materials are commonly use in highway construction because of their good

shear strength and tensile properties.

tensile and compression properties.

binding and water proofing properties.

shear strength and tensile properties.

Biochemical oxygen demand (BOD) of waste water is a measure of

concentration of chemically oxidisable matter

total concentration of a biochemicals

total concentration of organic matter

concentration of biodegradable organic matter

concentration of chemically oxidisable matter

The disinfection efficiency of chlorine in water treatment

remains constant at all pH values.

is increased by increased pH values.

remains constant at all pH values.

is reduced by increased pH value.

The equation along a stream line holds true for :

steady, frictionless, incompressible fluid

steady, frictionless, compressible fluid

steady, uniform, incompressible fluid

steady, frictionless, incompressible fluid

Use of coagulants such as alum

results in reduction of pH of the treated water.

results in increase of pH of the treated water.

results in no chnage in pH of the treated water.

The drop manholes are provided in a sewerage system when there is

change from gravity system to pressure system

change in alignment of sewer line

change in the elevation of ground level

change from gravity system to pressure system

Two primary air pollutants are

nitrogen oxide and peroxyacetylnitrate

Bituminous materials are used in highway construction primarily because of their :

cementing and water-proofing properties

black colour which facilitates road markings

Pipingin soil occurs when

sudden change in permeability occurs

effective pressure becomes zero

At highway stretches where the required overtaking sight distance cannot be provided, it is necessary to incorporate in such sections the following :

half of the required overtaking sight distance

at least twice the stopping sight distance

half of the required overtaking sight distance

one third of the required overtaking sight distance

three times the stopping sight distance.

The modulus of rupture of concrete gives

the characteristic strength of the concrete

the direct tensile strength of the concrete

the direct compressive strength of the concrete

the tensile strength of the concrete under bending

the characteristic strength of the concrete

Two flow patterns are represented by their stream functions œà1 and œà2 as given below:œà1 = x2 + y2, œà2 = 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 Bowen ratio is defined as :

Ratio of heat and vapour diffusivities.

Proportionality constant between vapour heat flux and sensible heat flux.

Ratio of actual evapotranspiration and potential evapotranspiration.

Proportionality constant between heat energy used up in evaporation and the bulk radiation from a water body.

the elevation of hydraulic grade line is assumed for each junction point

the algebraic sum of discharges around each circuit is zero

the algebraic sum of (pressure + datum) head drops around each circuit is zero

the elevation of hydraulic grade line is assumed for each junction point

elementary circuits are replaced by equivalent pipes

Determine the correctness of otherwise of the following Assertion [A] and the Reason [R]. Assertion [A] : The crown of the outgoing larger diameter sewer is always matched with the crown of incoming smaller diameter sewer. Reason [R] : It eliminates backing up of sewage in the incoming smaller diameter sewer.

Both [A] and [R] are true and [R] is not the correct reason for [A]

Both [A] and [R] are true and [R] is the correct reason for [A]

Both [A] and [R] are true and [R] is not the correct reason for [A]

An important purpose of prime coats is to:

promote the bond between the sub-base cause and the sub-grade

promote the bond between the base and the wearing courses

promote the adhesion between an existing wearing surface and a subsequent wearing surface

promote the bond between the sub-base cause and the sub-grade

increase the stability of the sub-grade

The centre of pressure of a liquid on a plane surface immersed vertically in a static body of liquid, always lies below the centroid of the surface area, because

in liquids the pressure acting is same in-all directions

there is no shear stress in liquids at rest

the liquid pressure is constant over depth

the liquid pressure increases linearly with depth

386 + Mcqs in Gate Exam Questions in Civil Engineering Page 4 McqOptions

151.	A linear relationship is observed between speed and density on a certain section of a highway. The free flow speed is observed to be 80 km per hour and the jam density is estimated as 100 vehicles per km length. Based on the above relationship, the maximum flow expected on this section and the speed at the maximum flow will respectively be
A.	8000 vehicles per hour and 80 km per hour
B.	8000 vehicles per hour and 25 km per hour
C.	2000 vehicles per hour and 80 km per hour
D.	2000 vehicles per hour and 40 km per hour
Answer» E.

Discussion

152.	Flow at critical depth takes place in an open channel When
A.	for a given specific energy, discharge is maximum
B.	for a given discharge, specific energy is maximum
C.	discharge is minimum for a given specific energy
D.	discharge is maximum for a given specific force
Answer» C. discharge is minimum for a given specific energy

Discussion

153.	Coagulation-flocculation with alum is performed :
A.	immediately before chlorination
B.	immediately after chlorination
C.	after rapid sand filtration
D.	before rapid sand filtration
Answer» E.

Discussion

154.	Bituminous materials are commonly use in highway construction because of their good
A.	tensile and compression properties.
B.	binding and water proofing properties.
C.	shear strength and tensile properties.
D.	bond and tensile properties.
Answer» C. shear strength and tensile properties.

Discussion

155.	The unit weight of a soil at zero air voids depends on :
A.	specific gravity
B.	water content
C.	unit weight of water
D.	all the above
Answer» E.

Discussion

156.	Biochemical oxygen demand (BOD) of waste water is a measure of
A.	total concentration of a biochemicals
B.	total concentration of organic matter
C.	concentration of biodegradable organic matter
D.	concentration of chemically oxidisable matter
Answer» D. concentration of chemically oxidisable matter

Discussion

157.	The disinfection efficiency of chlorine in water treatment
A.	is not dependent on pH value.
B.	is increased by increased pH values.
C.	remains constant at all pH values.
D.	is reduced by increased pH value.
Answer» C. remains constant at all pH values.

Discussion

158.	The equation along a stream line holds true for :
A.	steady, frictionless, compressible fluid
B.	steady, uniform, incompressible fluid
C.	steady, frictionless, incompressible fluid
D.	unsteady incompressible fluid
Answer» C. steady, frictionless, incompressible fluid

Discussion

159.	Use of coagulants such as alum
A.	None.
B.	results in reduction of pH of the treated water.
C.	results in increase of pH of the treated water.
D.	results in no chnage in pH of the treated water.
Answer» B. results in reduction of pH of the treated water.

Discussion

160.	The drop manholes are provided in a sewerage system when there is
A.	change in alignment of sewer line
B.	change in size of sewers
C.	change in the elevation of ground level
D.	change from gravity system to pressure system
Answer» D. change from gravity system to pressure system

Discussion

161.	Two primary air pollutants are
A.	sulphur oxide and ozone
B.	nitrogen oxide and peroxyacetylnitrate
C.	sulphur oxide and hydrocarbon
D.	ozone and peroxyacetynitrate
Answer» D. ozone and peroxyacetynitrate

Discussion

162.	In a section, shear centre is a point through which, if the resultant load passes, the section will not be subjected to any
A.	Bending
B.	Tension
C.	Compression
D.	Torsion
Answer» E.

Discussion

163.	Reaction at support b of the structure is
A.	P
B.	P2
Answer» B. P2

Discussion

164.	Plate bearing test with 20 cm diameter plate on soil subgrade yielded a pressure of 1.25 x 105 N/m2 at 0.5 cm deflection. What is the elastic modulus of subgrade ?
A.	56.18 x 105 N/m2
B.	22.10 x 105 N/m2
C.	44.25 x 105 N/m2
D.	50.19 x 105 N/m2
Answer» E.

Discussion

165.	The peak discharge of the instantaneous unit hydrograph of a basin, when compared to the peak discharge of a 4-hour unit hydrograph of that basin, would be
A.	greater
B.	equal
C.	equal or lesser
D.	lesser
Answer» B. equal

Discussion

166.	As per IS : 800-1984 the minimum pitch of rivets in a row is recommended as the diameter of the rivet times
A.	2
B.	2.5
C.	3
D.	4
Answer» C. 3

Discussion

167.	A 40¬∞ slope is excavated to a depth of 10 m in a deep layer of saturated clay of unit weight 20 kN.m3; the relevant shear strength parameters are cu = 70 kN/m2 and œÜu = 0. The rock ledge is at a great depth. The Taylor's stability coefficient for œÜu = 0 and 40¬∞ slope angle is 0.18. The factor of safety of the slope is :
A.	2
B.	2.1
C.	2.2
D.	2.3
Answer» B. 2.1

Discussion

168.	Bituminous materials are used in highway construction primarily because of their :
A.	cementing and water-proofing properties
B.	load bearing capacity
C.	high specific gravity
D.	black colour which facilitates road markings
Answer» B. load bearing capacity

Discussion

169.	Pipingin soil occurs when
A.	the soil is highly porous
B.	sudden change in permeability occurs
C.	effective pressure becomes zero
D.	the soil is highly stratified
Answer» D. the soil is highly stratified

Discussion

170.	The shape factor of the section shown in the below figure is
A.	1.5
B.	1.12
C.	2
D.	1.7
Answer» D. 1.7

Discussion

171.	If the deformations of the truss-members are as shown in parentheses, the rotation of the member bd is :
A.	0.5 x 10-2 radian
B.	1.0 x 10-2 radian
C.	1.5 x 10-2 radian
D.	2.0 x 10-2 radian
Answer» E.

Discussion

172.	At highway stretches where the required overtaking sight distance cannot be provided, it is necessary to incorporate in such sections the following :
A.	at least twice the stopping sight distance
B.	half of the required overtaking sight distance
C.	one third of the required overtaking sight distance
D.	three times the stopping sight distance.
Answer» B. half of the required overtaking sight distance

Discussion

173.	A steel beam supporting loads from the floor slab as well as from wall is termed as
A.	Stringer beam
B.	Lintel beam
C.	Spandrel beam
D.	Header beam
Answer» B. Lintel beam

Discussion

174.	In a BOD test using 5% dilution of the sample (15 ML of sample and 285 mL of dilution water), dissolved oxygen values for the sample and dilution water blank bottles after five days incubation at 20¬∞C were 3.80 and 8.80 mg/L. respectively. Dissolved oxygen originally present in the undiluted sample was 0.80 mg/L. The 5-day 20¬∞C BOD of the sample is
A.	116 mg/L
B.	108 mg/L
C.	100 mg/L
D.	92 Mg/L
Answer» E.

Discussion

175.	Alligator or map cracking is the common type of failure in
A.	concrete pavements
B.	bituminous surfacing
C.	gravel roads
D.	WBM construction
Answer» C. gravel roads

Discussion

176.	The modulus of rupture of concrete gives
A.	the direct tensile strength of the concrete
B.	the direct compressive strength of the concrete
C.	the tensile strength of the concrete under bending
D.	the characteristic strength of the concrete
Answer» D. the characteristic strength of the concrete

Discussion

177.	Compaction by vibratory roller is the best method of compaction in case of
A.	moist silty sand
B.	well graded dry sand
C.	clay of medium compressibility
D.	silt of high compressibility
Answer» C. clay of medium compressibility

Discussion

178.	A river 5 m deep consists of a sand bed with saturated unit weight of 20 kN/m3 . vw = 9.81 kN/m3. The effective vertical stress at 5 m from the top of sand bed is
A.	41 kN/m2
B.	51 kN/m2
C.	55 kN/m2
D.	53 kN/m2
Answer» C. 55 kN/m2

Discussion

179.	If the shear force at a section of beam under bending is equal to zero then the bending moment at the section is
A.	zero
B.	maximum
C.	minimum
D.	minimum or maximum
Answer» C. minimum

Discussion

180.	The parameters in Horton's infiltration equation are given as, fo = 7.62 cm/hour, fc = 1.34 cm/hour and k = 4.182/hour. For assumed continuous ponding the cumulative infiltration at the end of 2 hours is
A.	2.68 cm
B.	1.50 cm
C.	1.34 cm
D.	4.18 cm
Answer» D. 4.18 cm

Discussion

181.	Blue baby disease (methaemoglobinemia) in children is caused by the presence of excess
A.	Chorides
B.	Nitrates
C.	Fluoride
D.	Lead
Answer» C. Fluoride

Discussion

182.	Two flow patterns are represented by their stream functions œà1 and œà2 as given below:œà1 = x2 + y2, œà2 = 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

Discussion

183.	A cantilever beam is shown in the below figure. The moment to be applied at free end for zero vertical deflection at that point is
A.	9 kN.m clock wise
B.	9 kN.m anti-clockwise
C.	12 kN.m clockwise
D.	12 kN.m anti-clockwise
Answer» E.

Discussion

184.	The following two statements are made with reference to the planar truss shown below The truss is statically determinateThe truss is kinematically determinate With refernece to the above statements, which of the following applies ?
A.	Both statements are ture.
B.	Both statements are false.
C.	II is true but I false.
D.	I is true but II is false.
Answer» D. I is true but II is false.

Discussion

185.	Shear centre for an angle-purlin as shown in the below figure is located at,
A.	X
B.	Y
C.	Z
D.	none
Answer» B. Y

Discussion

186.	The Bowen ratio is defined as :
A.	Ratio of heat and vapour diffusivities.
B.	Proportionality constant between vapour heat flux and sensible heat flux.
C.	Ratio of actual evapotranspiration and potential evapotranspiration.
D.	Proportionality constant between heat energy used up in evaporation and the bulk radiation from a water body.
Answer» E.

Discussion

187.	In network of pipes
A.	the algebraic sum of discharges around each circuit is zero
B.	the algebraic sum of (pressure + datum) head drops around each circuit is zero
C.	the elevation of hydraulic grade line is assumed for each junction point
D.	elementary circuits are replaced by equivalent pipes
Answer» C. the elevation of hydraulic grade line is assumed for each junction point

Discussion

188.	The specific gravity of paving bitumen as per IS:73-1992 lies between
A.	1.10 and 1.06
B.	1.06 and 1.02
C.	1.02 and 0.97
D.	0.97 and 0.92
Answer» D. 0.97 and 0.92

Discussion

189.	The superelevation needed for a vehicle travelling at a speed of 60 kmph on a curve of radius 128 m on a surface with a coefficient of friction of 0.15 is :
A.	0.71
B.	0.81
C.	0.91
D.	0.61
Answer» B. 0.81

Discussion

190.	Determine the correctness of otherwise of the following Assertion [A] and the Reason [R]. Assertion [A] : The crown of the outgoing larger diameter sewer is always matched with the crown of incoming smaller diameter sewer. Reason [R] : It eliminates backing up of sewage in the incoming smaller diameter sewer.
A.	Both [A] and [R] are true and [R] is the correct reason for [A]
B.	Both [A] and [R] are true and [R] is not the correct reason for [A]
C.	Both [A] and [R] are false
D.	[A] is true but [R] is false
Answer» B. Both [A] and [R] are true and [R] is not the correct reason for [A]

Discussion

191.	A footing 2 m x 1 m exerts a uniform pressure of 150 kN/m2 on the soil. Assuming a load dispersion of 2 vertical to 1 horizontal the average vertical stress (kN/m2) at 1.0 m below the footing is
A.	50
B.	75
C.	80
D.	100
Answer» B. 75

Discussion

192.	A deep cut of 7 m has to be made in a clay with unit weight 16 kN/m3 and a cohesion of 25 kN/m2. What will be the factor of safety if one has to have a slope angle of 30¬∞ ? Stability number is given to be 0.178 (from Taylor's chart) for a depth factor of 3.
A.	0.8
B.	1.1
C.	1.25
D.	1
Answer» D. 1

Discussion

193.	The maximum shear stress in a solid shaft of circular cross-section having diameter d subjected to a torque T is œÑ. If the torque is increased by four times and the diameter of the shaft is increased by two times, the maximum shear stress in the shaft will be
A.	2œÑ
B.	œÑ
C.	œÑ/2
D.	œÑ/4
Answer» D. œÑ/4

Discussion

194.	The shape of clay particle is usually
A.	angular
B.	flaky
C.	tubular
D.	rounde
Answer» C. tubular

Discussion

195.	It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 5 percent, Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are
A.	35
B.	37
C.	65
D.	70
Answer» C. 65

Discussion

196.	The number of revolutions of a current meter in 50 seconds were found to be 12 and 30 corresponding to the velocities of 0.25 and 0.46 m/s respectively. What velocity (in m/s) would be indicated by 50 revolutions of that current meter in one minute ?
A.	0.42
B.	0.5
C.	0.6
D.	0.73
Answer» D. 0.73

Discussion

197.	An important purpose of prime coats is to:
A.	promote the bond between the base and the wearing courses
B.	promote the adhesion between an existing wearing surface and a subsequent wearing surface
C.	promote the bond between the sub-base cause and the sub-grade
D.	increase the stability of the sub-grade
Answer» C. promote the bond between the sub-base cause and the sub-grade

Discussion

198.	In IS : 800 (1984) the permissible compressive stress in column is based on :
A.	Euler formula
B.	Secant formula
C.	Rankine-Gordan formula
D.	Rankine-Merchant formula
Answer» C. Rankine-Gordan formula

Discussion

199.	The plastic modulus of a section is 4.8 x 10-4 m3. The shape factor is 1.2. The plastic moment capacity of the section is 120 kN.m. The yield stress of the material is
A.	100 MPa
B.	240 MPa
C.	250 MPa
D.	300 MPa
Answer» D. 300 MPa

Discussion

200.	The centre of pressure of a liquid on a plane surface immersed vertically in a static body of liquid, always lies below the centroid of the surface area, because
A.	in liquids the pressure acting is same in-all directions
B.	there is no shear stress in liquids at rest
C.	the liquid pressure is constant over depth
D.	the liquid pressure increases linearly with depth
Answer» E.

Discussion

Explore topic-wise MCQs in Civil Engineering.

Flow at critical depth takes place in an open channel When

Coagulation-flocculation with alum is performed :

Bituminous materials are commonly use in highway construction because of their good

The unit weight of a soil at zero air voids depends on :

Biochemical oxygen demand (BOD) of waste water is a measure of

The disinfection efficiency of chlorine in water treatment

The equation along a stream line holds true for :

Use of coagulants such as alum

The drop manholes are provided in a sewerage system when there is

Two primary air pollutants are

In a section, shear centre is a point through which, if the resultant load passes, the section will not be subjected to any

Reaction at support b of the structure is

Plate bearing test with 20 cm diameter plate on soil subgrade yielded a pressure of 1.25 x 105 N/m2 at 0.5 cm deflection. What is the elastic modulus of subgrade ?

The peak discharge of the instantaneous unit hydrograph of a basin, when compared to the peak discharge of a 4-hour unit hydrograph of that basin, would be

As per IS : 800-1984 the minimum pitch of rivets in a row is recommended as the diameter of the rivet times

Bituminous materials are used in highway construction primarily because of their :

Pipingin soil occurs when

The shape factor of the section shown in the below figure is

If the deformations of the truss-members are as shown in parentheses, the rotation of the member bd is :

At highway stretches where the required overtaking sight distance cannot be provided, it is necessary to incorporate in such sections the following :

A steel beam supporting loads from the floor slab as well as from wall is termed as

Alligator or map cracking is the common type of failure in

The modulus of rupture of concrete gives

Compaction by vibratory roller is the best method of compaction in case of

A river 5 m deep consists of a sand bed with saturated unit weight of 20 kN/m3 . vw = 9.81 kN/m3. The effective vertical stress at 5 m from the top of sand bed is

If the shear force at a section of beam under bending is equal to zero then the bending moment at the section is

The parameters in Horton's infiltration equation are given as, fo = 7.62 cm/hour, fc = 1.34 cm/hour and k = 4.182/hour. For assumed continuous ponding the cumulative infiltration at the end of 2 hours is

Blue baby disease (methaemoglobinemia) in children is caused by the presence of excess

Two flow patterns are represented by their stream functions œà1 and œà2 as given below:œà1 = x2 + y2, œà2 = 2xy If these two patterns are superimposed on one another, the resulting streamline pattern can be represented by one of the following :

A cantilever beam is shown in the below figure. The moment to be applied at free end for zero vertical deflection at that point is

The following two statements are made with reference to the planar truss shown below The truss is statically determinateThe truss is kinematically determinate With refernece to the above statements, which of the following applies ?

Shear centre for an angle-purlin as shown in the below figure is located at,

The Bowen ratio is defined as :

In network of pipes

The specific gravity of paving bitumen as per IS:73-1992 lies between

The superelevation needed for a vehicle travelling at a speed of 60 kmph on a curve of radius 128 m on a surface with a coefficient of friction of 0.15 is :

A footing 2 m x 1 m exerts a uniform pressure of 150 kN/m2 on the soil. Assuming a load dispersion of 2 vertical to 1 horizontal the average vertical stress (kN/m2) at 1.0 m below the footing is

A deep cut of 7 m has to be made in a clay with unit weight 16 kN/m3 and a cohesion of 25 kN/m2. What will be the factor of safety if one has to have a slope angle of 30¬∞ ? Stability number is given to be 0.178 (from Taylor's chart) for a depth factor of 3.

The maximum shear stress in a solid shaft of circular cross-section having diameter d subjected to a torque T is œÑ. If the torque is increased by four times and the diameter of the shaft is increased by two times, the maximum shear stress in the shaft will be

The shape of clay particle is usually

The number of revolutions of a current meter in 50 seconds were found to be 12 and 30 corresponding to the velocities of 0.25 and 0.46 m/s respectively. What velocity (in m/s) would be indicated by 50 revolutions of that current meter in one minute ?

An important purpose of prime coats is to:

In IS : 800 (1984) the permissible compressive stress in column is based on :

The plastic modulus of a section is 4.8 x 10-4 m3. The shape factor is 1.2. The plastic moment capacity of the section is 120 kN.m. The yield stress of the material is

The centre of pressure of a liquid on a plane surface immersed vertically in a static body of liquid, always lies below the centroid of the surface area, because