Civil engineer objective questions – Concrete Technology (Section-2)

51. Bulking of coarse aggregate is 

a) less as compared to that of sand

b) more as compared to that of sand 

c) 15% at 4% moisture content

d) negligible

52. Sand requiring a high water cement ratio, belongs to

a) zone I                                                

b) zone II

c) zone III                                              

d) zone IV

53. Sands of zone I are

a) coarse                                              

b) medium

c) medium to fine                              

d) fine

54. Fineness modulus modulus of fine aggregate is between 

a) 2-3.5                                                

b) 3.5-5.0

c) 5.0-6.0                                             

d) 6.0-7.5

55. The size of fine aggregates does not exceed

a) 2.75 mm                                         

b) 3.00 mm

c) 3.75 mm                                         

d) 4.75 mm

56. The function of fine aggregate is:

a) to assist in producing workability and uniformity in the Mixture

b) to assist the cement paste to hold the coarse aggregate particles in suspension

c) to promote plasticity in the mixture and prevent possible segregation of paste and coarse aggregate 

d) all of the above

57. An aggregate should

a) be of proper shape and size

b) be clean, hard and well graded

c) possess chemical stability

d) all of the above

58. An aggregate generally should not preferred for use in concrete is one which has the following surface texture 

a) smooth                                                

b) rough

c) glossy                                                   

d) granular

59. The rock which is not calcareous, it

a) lime stone                                           

b) macl 

c) chalk                                                    

d) laterite

60. If fineness modulus of sand is 2.5, it is graded as

a) very fine sand                                   

b) fine sand

c) medium sand                                    

d) coarse sand

61. Pick up the incorrect statement from the following:

a) in properly graded aggregates, bulk density is more 

b) in single size aggregates, bulk density is least 

c) in single size aggregates, bulk density is maximum

d) none of the above

62. The bulk density of aggregates, depends upon

a) shape                                                           

b) grading

c) compaction                                                 

d) all of the above

63. The bulk density of aggregates, is generally expressed as 

a) tones/cubic metre                                   

b) kg/cubic metre

c) kg/litre                                                       

d) gm/ cubic cm

64. Pick up the correct statement from the following:

a) continuous grading is not necessary for obtaining a minimum of air voids

b) the omission of a certain size of aggregate is shown by straight horizontal line on the grading curve 

c) the omission of a certain size of aggregate is shown by straight horizontal line on the grading curve

d) all of the above

65. The type of aggregate of same nominal size, which contain less voids when compacted, are 

a) rounded spherical                                   

b) irregular

c) flaky                                                           

d) none of these

66. Inert material of a cement concrete mix, is 

a) water                                                        

b) cement

c) aggregate                                                 

d) none of the above

67. According to IS: 382-1963, a good aggregate should be 

a) chemically inert                                      

b) sufficiently strong

c) hard and durable                                    

d) all of the above

68. An aggregate is known as cyclopean aggregate if its size is more than

a) 4.75 mm                                                 

b) 30 mm

c) 60 mm                                                     

d) 75 mm

69. Pick up the correct statement from the following: 

a) the maximum size of a coarse aggregate, is 75mm and minimum 4.75mm 

b) the maximum size of a fine aggregate, is 4.75mm and minimum 0.075mm 

c) the material having particles of size varying from 0.06mm to 0.002mm is known as slit

d) the material having particles of size less than 0.002mm, is known as clay

e) all of the above

70. If the aggregates completely pass through a sieve of size 75mm and are retained on a sieve of size 60mm, the particular aggregate will be flaky if its minimum dimension is less than.

a) 20.5 mm                                                            

b) 30.5 mm

c) 40.5 mm                                                            

d) 50.5 mm

71. In Q.70 be known as elongated aggregate if its length is not less than

a) 91.5mm                                                              b)101.5 mm

c)111.5mm                                                             d) 121.5 mm

72. 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

73. A flaky aggregate is said to be elongated if its length is 

a) equal to the mean size

b) twice than the mean size 

c) thrice than the mean size

d) four times than the mean size

74. The minimum percentage of void in round aggregate is

a) 33 %                                                                   

b) 53%

b) 43%                                                                   

d) 63 %

75. The light weight aggregates may be obtained from 

a) sedimentary rocks                                        

b) metamorphic rocks

c) igneous rocks                                                 

d) volcanic source

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"Structural Engineer" with over 5 years of experience in estimation, structural design, and surveying. I am passionate about using my skills to create safe and sustainable structures. I am also a keen writer, and I enjoy sharing my knowledge and experiences with others.