Civil Engineering Competitive Questions Part 1

Civil Engineering Competitive Questions

 

Select the incorrect statement      

[ A ]    R.C.C has better fire resistance than steel

[ B ]    R.C.C. structure is economical than steel structure

[ C ]    Strength of concrete decreases as age increases

[ D ]    R.C.C can be used for under water and marine structures

           Answer : C    

3         Water cement ratio is the ratio of  

[ A ]    Water to cement by weight

[ B ]    Water to cement by volume

[ C ]    Cement to water by weight

[ D ]    Cement to water by volume

           Answer : A    

4         Concrete is   

[ A ]    Weak in tension

[ B ]    Strong in tension

[ C ]    Strong in both tension and compression

[ D ]    Weak in compression

           Answer : A    

5         The entrained air in concrete        

[ A ]    Increases the strength

[ B ]    Decreases the resistance to weathering

[ C ]    Increases the workability

[ D ]    Decreases the workability

           Answer : C    

6         Concrete is unsuitable for compaction by vibration if it is        

[ A ]    Semi – plastic

[ B ]    Plastic

[ C ]    Earth moist

[ D ]    Dry

           Answer : B    

7         The strength and quality of concrete depends upon     

(i)Grading of aggregates

(ii)Shape of aggregates

(iii)Surface area of aggregates

(iv)Surface texture of aggregates

[ A ]    i, ii and iv

[ B ]    ii, iii and iv

[ C ]    i, iii and iv

[ D ]    i, ii, iii and iv

           Answer : D    

8         In order to avoid segregation, fresh concrete should be dropped from a height of  

[ A ]    Less than one meter

[ B ]    Less than two metres

[ C ]    More than one metre

[ D ]    More than two metres

Answer : A

9         The process of hardening of concrete in the presence of water is called

[ A ]    Creep

[ B ]    Hydration

[ C ]    Shrinkage

[ D ]    Curing

           Answer : B    

10       The process of keeping the concrete structure moist is called 

[ A ]    Hydration

[ B ]    Curing

[ C ]    Creep

[ D ]    Shrinkage

           Answer : B    

11       The separation of water or water cement mixture from the freshly laid concrete is known as

[ A ]    Workability

[ B ]    Segregation

[ C ]    Bleeding

[ D ]    Creep

           Answer : C    

12       The continuous strain, which the concrete undergoes due to application of external loads is

called 

[ A ]    Creep

[ B ]    Bleeding

[ C ]    Workability

[ D ]    Segregation

           Answer : A    

13       The process of conversion of plastic concrete to solid stage is called          

[ A ]    Hydration

[ B ]    Hardening

[ C ]    Setting

[ D ]    Curing

           Answer : C    

14       At 28 days of curing concrete attains a strength of       

[ A ]    20 to 25%

[ B ]    60 to 70%

[ C ]    65 to 80%

[ D ]    90 to 95%

           Answer : D    

15       In a mass concrete, the aggregates occupy a space of          

[ A ]    25%

[ B ]    75%

[ C ]    40%

[ D ]    60%

           Answer : B    

16       The coarse aggregate which possess the property of good interlocking are 

[ A ]    rounded shape

[ B ]    elongated shape

[ C ]    angular shape

[ D ]    none of the above

           Answer : C    

17       While placing of concrete the thickness of each layer for R.C.C. is   

[ A ]    150 to 300 mm

[ B ]    450 mm

[ C ]    500 to 750 mm

[ D ]    500 mm

           Answer : A    

18       Increase in water content in a cement concrete 

(i) Increases workability

(ii) Increases the strength

[ A ]    i

[ B ]    ii

[ C ]    both (i) and (ii)

[ D ]    neither (i) nor (ii)

           Answer : A    

19       Slump cone test is used to determine     

[ A ]    Shrinkage of concrete mix

[ B ]    Creep of concrete

[ C ]    Workability of concrete mix

[ D ]    Soundness of concrete

           Answer : C    

20       While determining the workability of concrete mix, the compaction factor test is ——than the

slump cone test       

[ A ]    Less accurate

[ B ]    More accurate

[ C ]    Approximate method

[ D ]    None of the above

           Answer : B    

21       Workability of concrete mix with low water cement ratio is determined by    

[ A ]    Tensile strength test

[ B ]    Slump cone test

[ C ]    Compaction factor test

[ D ]    Flexural strength test

           Answer : C    

22       If the slump of a concrete mix is 50 to 100 mm, its workability is       

[ A ]    Very low

[ B ]    Low

[ C ]    Medium

[ D ]    High

           Answer : C    

23       A compaction factor of 0.75 indicates ________workability    

[ A ]    Very low

[ B ]    Low

[ C ]    Medium

[ D ]    High

           Answer : A    

24       Shrinkage in concrete can be reduced by using 

(i) Low water cement ratio (ii) More amount of cement in the concrete

(iii) Presaturated aggregates

[ A ]    i

[ B ]    i and ii

[ C ]    i and iii

[ D ]    i, ii and iii

           Answer : C    

25       The process of proper and accurate measurement of concrete ingredients for uniformity of

proportion, is known as      

[ A ]    Curing

[ B ]    Mixing

[ C ]    Grading

[ D ]    Batching

           Answer : D    

26       Select incorrect statement from the following     

[ A ]    With passage of time, the strength of cement decreases

[ B ]    With passage of time, the strength of cement increases

[ C ]    After a period of 24 months, the strength of cement reduces to 50%

[ D ]    The concrete made with storage deteriorated cement; gains strength with     time.

           Answer : B    

27       For compacting plain concrete road surface of thickness less than 20 cm, the following

vibrator is used.       

[ A ]    Internal vibrator

[ B ]    Screed vibrator

[ C ]    Form vibrator

[ D ]    None of the above

           Answer : B    

28       Slump test of concrete is a measure of its         

[ A ]    Consistency

[ B ]    Compressive strength

[ C ]    Tensile strength

[ D ]    Impact value

           Answer : A    

29       Concrete gains strength due to     

[ A ]    Chemical reaction of cement with sand and coarse aggregates

[ B ]    Evaporation of water from concrete

[ C ]    Hydration of cement

[ D ]    All the above

           Answer : C    

30       Minimum grade of concrete for R.C.C. should be _________ , as per IS. 456-2000         

[ A ]    M10

[ B ]    M14

[ C ]    M20

[ D ]    M25

           Answer : C    

31       A concrete mass containing 5% of voids 

[ A ]    Increases its strength by 30%

[ B ]    Reduces its strength by 30%

[ C ]    Increases its strength by 5%

[ D ]    Reduces its strength by 5%

           Answer : B    

32       Workability of a concrete – mix is determined by          

(i)Slump cone test

(ii)Compaction factor test

(iii)Vee bee test

[ A ]    i

[ B ]    ii

[ C ]    i and ii

[ D ]    i, ii and iii

           Answer : D    

33       High strength of concrete requires a water cement ratio of     

[ A ]    0.10 to 0.15

[ B ]    0.25 to 0.30

[ C ]    0.45 to 0.60

[ D ]    0.75 to 0.90

           Answer : B    

34       One bag of cement is equivalent to         

[ A ]    50 litres

[ B ]    35 litres

[ C ]    28 litres

[ D ]    14 litres

           Answer : B    

35       One cubit metre of cement weights         

[ A ]    1000 kg

[ B ]    1200 kg

[ C ]    1440 kg

[ D ]    1600 kg

           Answer : C    

36       As per IS: 456-2000, modulus of elasticity of concrete (in N/mm2) is given by       

[ A ]    5700 vfCK

[ B ]    5000 vfCK

[ C ]    3700 vfCK

[ D ]    3000 vfCK

           Answer : B    

37       In working stress method of design, the factor of safety for concrete and steel respectively

are     

[ A ]    3.0 and 1.8

[ B ]    3.0 and 1.18

[ C ]    3.0 and 1.15

[ D ]    1.5 and 1.5

           Answer : A    

38       In Limit state method of design, the factor of safety for concrete and steel respectively are

 

[ A ]    3.00 and 1.80

[ B ]    1.50 and 1.18

[ C ]    1.50 and 1.15

[ D ]    1.50 and 1.50

           Answer : C    

39       Specific weight of Reinforced cement concrete is        

[ A ]    24 N/m3

[ B ]    24 kN/m3

[ C ]    25 N/m3

[ D ]    25 kN/m3

           Answer : D    

40       The tensile strength of concrete is about ________ of its compressive strength    

[ A ]    10% to 15%

[ B ]    30% to 40%

[ C ]    50%

[ D ]    60% to 75%

           Answer : A    

41       The shrinkage strain of concrete is generally taken as 

[ A ]    0.3

[ B ]    0.03

[ C ]    0.003

[ D ]    0.0003

           Answer : D    

42       The tensile strength of concrete is given by       

[ A ]    0.45 vfCK

[ B ]    0.60 vfCK

[ C ]    0.70 vfCK

[ D ]    0.90 vfCK

           Answer : C    

43       The ratio of bond stress for HYSD bars to that of plain bars   

[ A ]    0.714

[ B ]    0.9

[ C ]    1.4

[ D ]    1.8

           Answer : C    

44       The proof stress in steel is the stress corresponding to the strain of  

[ A ]    0.2

[ B ]    0.02

[ C ]    0.002

[ D ]    0.0002

           Answer : C    

45       In the mixer, the concrete should be mixed for at least 

[ A ]    1 to 2 minutes

[ B ]    2 to 3 minutes

[ C ]    3 to 5 minutes

[ D ]    5 to 7 minutes

           Answer : B    

46       As per IS: 456-2000, the maximum size of aggregate is         

[ A ]    1/4 of maximum thickness of member

[ B ]    1/4 of minimum thickness of member

[ C ]    1/5 of maximum thickness of member

[ D ]    1/5 of minimum thickness of member

           Answer : B    

47       Water used for mixing of concrete should be free from 

(i)Oils

(ii)Salts

(iii)Acids

[ A ]    i

[ B ]    iii

[ C ]    i and iii

[ D ]    i, ii and iii

           Answer : D    

48       Modulus of elasticity of concrete is primarily influenced by     

[ A ]    Elastic properties of aggregate

[ B ]    Curing of concrete

[ C ]    Age of concrete

[ D ]    Mix proportion and type of cement

           Answer : A    

49       As the workability increases compaction factor  

[ A ]    Decreases

[ B ]    Increases

[ C ]    Remains same

[ D ]    None of the above

           Answer : B    

50       Shrinkage of concrete is mostly influenced by   

[ A ]    Environmental conditions

[ B ]    Size of member

[ C ]    Cement in concrete

[ D ]    The total amount of water present in concrete

           Answer : D    

51       During the process of hardening of cement, _______ will takes place         

[ A ]    Bleeding

[ B ]    Segregation

[ C ]    Hydration

[ D ]    All the above

           Answer : C    

52       Due to Bleeding action concrete becomes         

[ A ]    Weak

[ B ]    Strong

[ C ]    Hard

[ D ]    Durable

           Answer : A    

53       About 70% to 80% of cement is contributed by  

[ A ]    Tricalcium silicate and Tricalcium aluminate

[ B ]    Tricalcium silicate and Dicalcium silicate

[ C ]    Tricalcium Aluminate and Dicalcium silicate

[ D ]    Tricalcium Aluminate and Tetra calcium Aluminoferrite

           Answer : B    

54       When compared to ordinary Portland cement, Rapid hardening Portland cement contains

______________ amount of lime content          

[ A ]    Equal

[ B ]    Greater

[ C ]    Lesser

[ D ]    Zero

           Answer : B    

55       The following compound has the property of early strength as well as ultimate strength   

[ A ]    C3S

[ B ]    C2S

[ C ]    C3A

[ D ]    C4AF

           Answer : A    

56       Which of the following compounds is considered to be an undesirable compound for cement

[ A ]    C3S

[ B ]    C2S

[ C ]    C3A

[ D ]    C4AF

           Answer : D    

57       Which of the following compound is susceptible to be attached by alkalies and salts        

[ A ]    C3S

[ B ]    C3S

[ C ]    C3A

[ D ]    C3AF

           Answer : C    

58       The heat generated in ordinary cement at the end of 3 days is about          

[ A ]    60 cal/g

[ B ]    80 cal/g

[ C ]    100 cal/g

[ D ]    120 cal/g

           Answer : B    

59       Low heat cement contains more amount of __________ than that of ordinary Portland

cement          

[ A ]    C3S

[ B ]    C2S

[ C ]    C3A

[ D ]    None of the above

           Answer : B    

60       In Portland Blast furnace slag cement, the blast furnace slag content shall not exceed     

[ A ]    50%

[ B ]    65%

[ C ]    80%

[ D ]    90%

           Answer : B    

61       White cement contains less amount of ___________  

[ A ]    Lime

[ B ]    Silica

[ C ]    Alumina

[ D ]    Iron oxide

           Answer : D    

62       In fineness test on cement, residue left on I.S. sieve no.9 shall not exceed __________ by

weight of the sample of cement    

[ A ]    5%

[ B ]    10%

[ C ]    15%

[ D ]    20%

           Answer : B    

63       Ordinary Portland cement requires a specific surface of         

[ A ]    1250 cm2/gm

[ B ]    2250 cm 2/gm

[ C ]    3250 cm 2/gm

[ D ]    3500 cm 2/gm

           Answer : B    

64       The maximum percentage of chemical ingredient of cement is         

[ A ]    Iron oxide

[ B ]    Silica

[ C ]    Lime

[ D ]    Magnesium oxide

           Answer : C    

65       The minimum percentage of chemical ingredient of cement is          

[ A ]    Iron oxide

[ B ]    Silica

[ C ]    Lime

[ D ]    Magnesium oxide

           Answer : D    

66       Efflorescence in cement is caused due to an excess of          

[ A ]    Alkalies

[ B ]    Silica

[ C ]    Iron oxide

[ D ]    Alumina

           Answer : A    

67       Dicalcium silicate (C2S)     

[ A ]    rates rapidly

[ B ]    Hardens rapidly

[ C ]    Generates less heat of hydration

[ D ]    Has less resistance to sulphate attack

           Answer : C    

68       Tricalcium aluminate (C3A)          

[ A ]    Hydrating less rapidly

[ B ]    Is a redundant compound

[ C ]    To be attacked by alkalies and salts

[ D ]    None of these

           Answer : C    

69       For road pavements, the cement generally used, is     

[ A ]    Ordinary Portland cement

[ B ]    Rapid hardening cement

[ C ]    Low heat cement

[ D ]    Blast furnace slag cement

           Answer : A    

70       For mass concrete work, the type of cement preferable is      

[ A ]    Ordinary Portland cement

[ B ]    Rapid hardening cement

[ C ]    Low heat cement

[ D ]    Blast furnace slag cement

           Answer : C    

71       Le-chatelier apparatus is used for 

[ A ]    Fineness test

[ B ]    Consistency test

[ C ]    Soundness test

[ D ]    Compressive strength test

           Answer : C    

72       The diameter of the Vicat plunger is 10 mm and its length varies form        

[ A ]    40 mm

[ B ]    50 mm

[ C ]    55 mm

[ D ]    60 mm

           Answer : B    

73       Inert material of a cement concrete mix, is         

[ A ]    Water

[ B ]    Aggregate

[ C ]    Cement

[ D ]    None of these

           Answer : B    

74       An aggregate is said to be flaky, if its least dimension is less than    

[ A ]    2/3 mean dimension

[ B ]    3/4 mean dimension

[ C ]    3/5 mean dimension

[ D ]    5/8 mean dimension

           Answer : C    

75       Workability of concrete for a given water content is good, if the aggregates are      

[ A ]    Rounded

[ B ]    Irregular

[ C ]    Angular

[ D ]    Flaky

           Answer : A    

76       Setting time of cement increases by adding      

(i)gypsum

(ii)sodium oxide

(iii)calcium chloride

[ A ]    i

[ B ]    i and ii

[ C ]    i and iii

[ D ]    i, ii and iii

           Answer : A    

77       The cement becomes useless if its absorbed moisture content exceeds     

[ A ]    1%

[ B ]    2%

[ C ]    3%

[ D ]    5%

           Answer : D    

78       The size of fine aggregates does not exceed     

[ A ]    2.75 mm

[ B ]    3.75 mm

[ C ]    4.75 mm

[ D ]    5.75 mm

           Answer : C    

79       Water used for mixing concrete should be         

[ A ]    Slightly acidic

[ B ]    Free from bacteria

[ C ]    Distilled

[ D ]    Potable

           Answer : D    

80       The workability of concrete is mostly influenced by its  

[ A ]    Water cement ratio

[ B ]    Aggregate cement ratio

[ C ]    Cement content

[ D ]    Water content

           Answer : A    

81       Chief constituent of ordinary Portland cement is          

[ A ]    Lime

[ B ]    Alumina

[ C ]    Magnesia

[ D ]    Iron oxide

           Answer : A    

82       The heat of hydration for low heat cement at the age of 7 days shall not exceed   

[ A ]    80 cal / gm

[ B ]    75 cal / gm

[ C ]    70 cal / gm

[ D ]    65 cal / gm

           Answer : D    

83       Cement is obtained by burning a mixture of the following materials  

[ A ]    Siliceous materials

[ B ]    Argillaceous materials

[ C ]    Calcareous materials

[ D ]    All the above

           Answer : D    

84       For determining the compressive strength test on cement is, the percentage amount of

water to be added as (Pa = Percentage of water for required consistency)  

[ A ]    0.25 Pa + 2.5

[ B ]    0.25 Pa + 3.5

[ C ]    0.35 Pa + 2.5

[ D ]    0.35 Pa + 3.5

           Answer : B    

85       Minimum compressive strength of cement required at the age of 3 days for ordinary

Portland cement of grade 33 is     

[ A ]    1.15 N/mm2

[ B ]    11.5 N/mm2

[ C ]    2.10 N/mm2

[ D ]    21 N/mm2

           Answer : B    

86       Bulking of sand takes place due to          

[ A ]    Surface tension

[ B ]    Viscosity

[ C ]    Capillarity

[ D ]    None of the above

           Answer : A    

87       Creep coefficient is the ratio of     

[ A ]    Ultimate Creep strain to elastic strain

[ B ]    Elastic strain to ultimate Creep strain

[ C ]    Elastic strain to plastic strain

[ D ]    Plastic strain to elastic strain

           Answer : A    

88       Generally the strength of concrete is represented by the crushing stress of concrete cube of

size    

[ A ]    50 mm

[ B ]    100 mm

[ C ]    150 mm

[ D ]    250 mm

           Answer : C    

89       As per IS:1139, the characteristic yield strength for hot rolled High yield strength deformed

bars is 

[ A ]    250 N/mm2

[ B ]    415 N/mm2

[ C ]    500 N/mm2

[ D ]    550 N/mm2

           Answer : B    

90       As per IS:1139, the characteristic yield strength for cold twisted deformed bars is 

[ A ]    250 N/mm2

[ B ]    415 N/mm2

[ C ]    500 N/mm2

[ D ]    550 N/mm2

           Answer : C    

91       For reinforced concrete work, aggregates having a nominal size of ——– are generally used

[ A ]    20 mm

[ B ]    40 mm

[ C ]    50 mm

[ D ]    60 mm

           Answer : A    

92       The proportion of coarse aggregates to fire aggregates in structural concrete is usually   

[ A ]    0.50 – 1.25

[ B ]    1.25 – 4.50

[ C ]    1.50 – 2.50

[ D ]    0.25 – 0.75

           Answer : C    

93       Fly ash when added to concrete   

[ A ]    Acts as aggregates

[ B ]    Acts as pozzolona

[ C ]    Improves appearance

[ D ]    Reduces setting time

           Answer : B    

94       As per IS:456, the strength of concrete sample is less than    

[ A ]    The characteristic strength minus 1.35times the standard deviation

[ B ]    0.80 times the characteristic strength

[ C ]    Greater of (a) and (b)

[ D ]    None of the above

           Answer : C    

95       Characteristic strength of steel has been defined as    

[ A ]    0.1 % proof stress

[ B ]    0.2 % proof stress

[ C ]    0.4 % proof stress

[ D ]    Equal to proof stress

           Answer : B    

96       For Ordinary Portland cement concrete exposed to dry and hot weather conditions, good

moist curing period is         

[ A ]    7 days

[ B ]    10 days

[ C ]    14 days

[ D ]    None of the above

           Answer : B    

97       As per IS: 456-2000, recommended value for standard deviation for concrete mix from M30

to M50 is       

[ A ]    1 N/mm2

[ B ]    2 N/mm2

[ C ]    4 N/mm2

[ D ]    5 N/mm2

           Answer : D    

98       As per 1S: 456-2000, minimum grade of concrete in seat water constructions is   

[ A ]    M20

[ B ]    M25

[ C ]    M30

[ D ]    M50

           Answer : C    

99       The section of a reinforced beam where most distant concrete fiber in compression and

tension in steel attains permissible stresses simultaneously is called           

(i)Balanced section

(ii)Economic section

(iii)Critical section

[ A ]    i

[ B ]    i and ii

[ C ]    i and iii

[ D ]    i, ii and iii

           Answer : D    

100     As the percentage of steel increases      

[ A ]    Depth of neutral axis decreases

[ B ]    Depth of neutral axis increases

[ C ]    Lever arm increases

[ D ]    None of the above are correct

           Answer : B