Q.1

Shrinkage in concrete can be reduced by using

  • low water cement ratio
  • less cement in the concrete
  • proper concrete mix
  • presaturated aggregates
  • all the above.
Q.2

For quality control of Portland cement, the test essentially done is

  • setting time
  • soundness
  • tensile strength
  • consistency
  • all the above.
Q.3

Ifg of water is required to have a cement pasteg of normal consistency, the percentage of water is,

  • 20%
  • 25%
  • 30%
  • 35%
  • 40%
Q.4

Pick up the correct statement from the following:

  • Segregation is necessary for a workable concrete
  • Consistency does not affect the workability of concrete
  • If the slump increases, workability decreases
  • If the concrete mix is dry, the slump is maximum
  • None of these.
Q.5

Proper batching ensures

  • economy
  • durability
  • workability
  • strength
  • all the above.
Q.6

Segregation is responsible for

  • honey-combed concrete
  • porous layers in concrete
  • surface scaling in concrete
  • sand streaks in concrete
  • all the above.
Q.7

Separation of coarse aggregates from mortar during transportation, is known

  • bleeding
  • creeping
  • segregation
  • shrinkage
  • none of these.
Q.8

Under normal conditions using an ordinary cement, the period of removal of the form work, is :

  • 7 days for beam soffits
  • 14 days for bottom slabs of spans 4.6 m and more
  • 21 days for bottom beams over 6 m spans
  • 2 days for vertical sides of columns
  • all the above.
Q.9

Specified compressive strengh of concrete is obtained from cube tests at the end of

  • 3 days
  • 7 days
  • 14 days
  • 21 days
  • 28 days.
Q.10

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

  • rounded aggregate
  • irregular aggregate
  • angular aggregate
  • flaky aggregates.
Q.11

Addition of pozzolana to cement

  • decreases workability
  • increases strength
  • increases heat of hydration
  • decreases curing time
  • none of these.
Q.12

According to the recommendations of IS : 456-the expansion joints

  • are provided where plane changes abruptly
  • are provided to ensure minimum resistance
  • are supported on separate columns
  • do not carry reinforcement across them
  • all the above.
Q.13

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

  • 2/3 mean dimension
  • 3/4 mean dimension
  • 3/5 mean dimension
  • 5/8 mean dimension
  • none of these.
Q.14

Pick up the correct statement from the following:

  • Bulking of sand is caused due to formation of a thin film of surface moisture
  • Fine sand bulks more than coarse sand
  • With 10% moisture content by weight, the bulking of sand is increased by 50%.
  • The volume of fully saturated sand, is equal to the volume of dry and loose sand
  • All the above.
Q.15

The datum temperature for maturity by Plowman, is

  • 23°C
  • 0°
  • - 5.6°C
  • - 11.7°C
Q.16

Grading of sand causes great variation in

  • workability of concrete
  • strength of concrete
  • durability of concrete
  • handing and placing of concrete
  • all the above.
Q.17

For given water content, workability decreases if the concrete aggregates contain an excess of

  • thin particles
  • flat particles
  • elongated particles
  • flaky paticles
  • all the above.
Q.18

Pick up the incorrect statement from the following:

  • A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water
  • The strength of concrete decreases as the water cement ratio increases
  • If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure
  • Good compaction by mechanical vibrtions, increases the strength of concrete
  • None of these.
Q.19

For compacting plain concrete road surface of thickness less thancm, we use

  • internal vibrator
  • screed vibrator
  • form vibrator
  • none of these.
Q.20

Pick up the incorrect statement from the following:

  • The degree of grinding of cement, is called fineness
  • The process of changing cement paste into hard mass, is known as setting of cement
  • The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement
  • The heat generated during chemical reaction of cement with water, is known as heat of hydration
  • None of these.
Q.21

The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.is

  • 30%
  • 40%
  • 50%
  • 60%.
Q.22

Pick up the correct statement from the following:

  • Construction joints are necessarily planned for their locations
  • Expansion joints are provided to accommodate thermal expansion
  • Construction joints are provided to control shrinkage cracks
  • Expansion joints need not be provided in foundation concrete
  • All the above.
Q.23

Ordinary concrete is not used for concrete grade

  • M 100
  • M 150
  • M 200
  • M 250
  • M 400
Q.24

For given water content, workability decreases if the concrete aggregates contain an excess of

  • thin particles
  • flat particles
  • elongated particles
  • flaky paticles
  • all the above.
Q.25

1.S. Sieve Nos.mm and 4.mm are geneally used for grading of

  • coarse aggregates
  • fine aggregates
  • neither (a) nor (b)
  • both (a) and (b)
  • none of these.
Q.26

Percentage of pozzolanic material containing clay uptoused for the manufacture of pozzolana cement, is

  • 30%
  • 40%
  • 50%
  • 60%
  • 70%
Q.27

The produce impermeable concrete

  • thorough mixing of concrete is required
  • proper compaction of concrete is required
  • proper curing of concrete is required
  • properly graded and non-porous aggregates are requied
  • all the above.
Q.28

Hardening of cement occurs at

  • rapid rate during the first few days and afterwards it continues to increase at a decreased rate
  • slow rate during the first few days and afterwards it continues to increase at a rapid rate
  • uniform rate throughout its age
  • none of these.
Q.29

Pick up the correct statement from the following:

  • The free water is the amount of water added while mixing and the amount of water held on the surface of the aggregates prior to mixing
  • The total water is the free water and the amount actually absorbed by the aggregates
  • Neither (a) nor (b)
  • Both (a) and (b).
Q.30

For batching 1:3:6 concrete mix by volume, the ingredients required per bag ofkg cement, are:

  • 70 litres of sand and 120 litres of aggregates
  • 70 kg of sand and 140 litres of aggregates
  • 105 litres of sand and 140 litres of aggregates
  • 105 litres of sand and 210 litres of aggregates
  • none of these.
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